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1. Variability of N2 fixation in cowpea under phosphorus deficiency is related to phosphorus use efficiency

Author

Lazali, Mohamed, Brahimi, S, Ounane, Sidi Mohamed, Drevon, Jean-Jacques, Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes (UMR Eco&Sols), Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Département d’Agronomie, Faculté des sciences de la nature et de la vie et des sciences de la terre, Université de Djilali Bounaama Khemis Miliana (univ-DBKM), Département de Productions Végétales, École Nationale Supérieure d’Agronomie [Alger] (ENSA), Institut National de la Recherche Agronomique (INRA)-Institut de Recherche pour le Développement (IRD)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), École Nationale Supérieure d’Agronomie Alger (ENSA), and Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)

Subjects
Vegetal Biology, vigna unguiculata, carence en phosphore, food and beverages, [SDV.BV]Life Sciences [q-bio]/Vegetal Biology, nodulation, phosphore du sol, fixation symbiotique de l'azote, biomasse aérienne, Biologie végétale, variabilité genotypique
Abstract

Low availability of phosphorus (P) is a major constraint to legume production, and efforts are being made to identify legume genotypes with tolerance to low P and greater P use efficiency (PUE). Cowpea (Vigna unguiculata L.) genotypes vary in their adaptation to low-P soils. In order to investigate to what extent this variation may be related to PUE for symbiotic nitrogen fixation (SNF), five genotypes, Adrar, El Kala, Djenet, Tizi Ouzou and Bejaia, were grown in semihydroponic culture with sufficient versus deficient P supply. At the flowering stage, the biomass of plants and nodules and their P contents was determined after measuring the quantity of N2 fixed. The results showed that nodule and shoot biomass were less when P was deficient. The genotypes that presented the maximum growth during the experiment presented a high efficiency in use of the rhizobial symbiosis calculated as the slope of plant biomass regression as a function of nodulation. Under P-deficiency, efficiency in use of P for SNF was significantly increased in the genotypes El Kala, Djenet and Adrar and accompanied with an increase of the efficiency in use of the rhizobial symbiosis. Hence the large differences show that traits for more P uptake-efficient plants exist in the tested cowpea genotypes. This opens the possibility to breed for more P uptakeefficient varieties as a way to bring more sparingly soluble soil P into cycling in crop production and obtain capitalisation of soil P reserves.

Published
2016

2. Are phosphatases involved in the regulation of symbiotic nitrogen fixation under phosphorus deficiency?

Author

Lazali, Mohamed, Amenc, Laurie, Brahimi, Samira, Ounane, Sidi Mohamed, ProdInra, Archive Ouverte, Agricultural Sciences for sustainable Development - - AGRO2010 - ANR-10-LABX-0001 - LABX - VALID, Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes (UMR Eco&Sols), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA), Faculté des Sciences de la Nature et de la Vie & des Sciences de la Terre, Université de Djilali Bounaama Khemis Miliana (univ-DBKM), Département de Productions Végétales. Laboratoire d’Amélioration Intégratives des Productions Agricoles, École Nationale Supérieure d’Agronomie [Alger] (ENSA), Fabatropimed - Agropolis Fondation (ID 1001-009), ANR-10-LABX-0001,AGRO,Agricultural Sciences for sustainable Development(2010), and Institut National de la Recherche Agronomique (INRA)-Institut de Recherche pour le Développement (IRD)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)

Subjects
[SDV.BV]Life Sciences [q-bio]/Vegetal Biology, Nodule, Phosphorus, [SDV.BV] Life Sciences [q-bio]/Vegetal Biology, Common bean, FBPase, Transcript, Phytase, N2 fixing, RILs
Abstract

In this study, we highlight the differential expression of phosphatases (APases) within the nodules of Phaseolus vulgaris under phosphorus (P) deficiency and address whether this expression might influence the nodule conductance to O2 diffusion and the subsequent respiration that supports N2 fixation in legumes. The identification of APases genes expression was performed with in situ RT-PCR methodology in nodules of two P. vulgaris recombinant inbred lines; RIL115 (Pefficient) and RIL147 (P-inefficient) grown in hydroaeroponic culture under deficient versus sufficient P supply. Our results brought the first evidence that phytase, trehalose 6-P phosphatase and fructose 1,6 bisphosphatase were differentially expressed among nodule tissues of the RIL115 and RIL147 and suggested that the abundance of their transcripts in infected cells at the vicinity of inner cortex and in outer cortex cells to be considered as new mechanism by which nodules acclimate to P deficiency. This overexpression under P deficiency coupled with increased correspondent enzyme activities and improved rhizobial use efficiency, N2 fixation and is therefore likely to play an important role in tolerance to low P availability. It is suggested that APases are involved in the osmoregulation of nodule conductance to O2 diffusion that is associated with the adaptation to environmental constraints of nitrogenase activity in the infected N2 fixing central tissues of the nodule.

Published
2015

3. Phosphorus use efficiency for N2 fixation in the rhizobial symbiosis with legumes

Author

Drevon, Jean-Jacques, Abadie, Josiane, Alkama, Nora, Andriamananjara, Andry, Amenc, Laurie, Bargaz, Adnane, Carlssonn, Georg, Jaillard, Benoît, Lazali, Mohamed, Ghoulam, Cherki, Ounane, Sidi Mohamed, Pernot, Catherine, Sifi, Bouaziz, Tajini, Fatma, Zaman-Allah, Mainassara, Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes (UMR Eco&Sols), Institut National de la Recherche Agronomique (INRA)-Institut de Recherche pour le Développement (IRD)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Faculté des Sciences biologiques et agronomiques, Département d'Agronomie, Université Mouloud Mammeri [Tizi Ouzou] (UMMTO), LRI-SRA, Laboratoire des Radio-isotopes, Université d'Antananarivo, Swedish University of Agricultural Sciences (SLU), Faculté des Sciences et Techniques Guéliz, Université Cadi Ayyad [Marrakech] (UCA), Département de phytotechnie, École Nationale Supérieure d’Agronomie [Alger] (ENSA), Département des Légumineuses, Institut National de la Recherche Agronomique de Tunisie (INRAT), Université Abdou Moumouni [Niamey], Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA), and Laboratoire des Radio-Isotopes (LRI), Université d'Antananarivo

Subjects
0106 biological sciences, Rhizobia, Rhizobacteria, 01 natural sciences, Vigna, Symbiosis, Nitrogen fixation, in situ RT-PCR, [SDV.BV]Life Sciences [q-bio]/Vegetal Biology, 2. Zero hunger, Rhizosphere, biology, Nodules, fungi, Phosphatases, food and beverages, Phosphorus, 04 agricultural and veterinary sciences, 15. Life on land, biology.organism_classification, Legumes, Medicago truncatula, Agronomy, 040103 agronomy & agriculture, 0401 agriculture, forestry, and fisheries, Gene expression, Phaseolus, 010606 plant biology & botany
Abstract

Symbiotic nitrogen fixation (SNF) by legumes may provide an ecologically acceptable complement or substitute for mineral nitrogen fertilizers that farmers try to minimize for economic limitation and environment sake. However, phosphorus (P) deficiency is a major limiting factor for legume–rhizobia symbioses, particularly in acidic and calcareous soils. Nevertheless, the expression of legume SNF potential under P deficiency may be improved. Indeed genotypes contrasting in P use efficiency (PUE) for SNF could be found for such legumes spp. as Phaseolus vulgaris, Vigna unguiculata, or Medicago truncatula in hydroaeroponic culture under glasshouse conditions after inoculation with specific reference rhizobia. In order to assess the contribution of phosphatase activity to PUE for SNF, an in situ RT-PCR methodology was used to localize and quantify the mRNA of candidate genes in nodules of common bean grown under deficient versus sufficient P supply. The transcript localization of phytase, phosphoenolpyruvate phosphatase, and trehalose 6 phosphate phosphatase was found to be tissue specific and differ among any phosphatase APase genes, P treatments, and legume genotypes. In order to assess whether the genotypic difference in PUE for SNF may contribute to adaptation of the rhizobial symbiosis to low-P soils, the nodulation and growth of contrasting common-bean recombinant lines from the cross of BAT477 and DOR364 were assessed in fields of farmers in reference agroecosystems of the Mediterranean basin following a participatory approach. The most efficient genotype, namely RIL115, was superior in most fields where nodulation was above the threshold for significant contribution to legume nutrition. From those fields with low-P soils where adaptation was observed for low-efficiency genotypes, bacteria were isolated from nodules and rhizosphere in order to search for rhizobia or rhizobacteria that could increase the P efficiency for the legume symbiosis. Since mycorrhizae may contribute to the PUE, the tripartite symbiosis was tested in hydroaeroponic culture, showing that some species may limit nodulation by contrast with Glomus intradices that increased it under P deficiency. It is concluded that (i) phosphatases contribute to the use of organic P for N2 fixation and to the increase in nodule permeability to O2 under P deficiency; (ii) nodulation in agroecosystems varies considerably in space and time; (iii) high PUE for SNF may increase the N2-dependent growth of common bean in low-P soils and the overall P bioavailability; and (iv) some local rhizobia may contribute to the PUE for SNF.

Published
2015
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4. Advantage of intercropping maize [i](Zea mays[/i] L.) and common bean ([i]Phaseolus vulgaris[/i] L.) on yield and nitrogen uptake in Northeast Algeria

Author

Latati, M., Pansu, Marc, Drevon, Jean-Jacques, Ounane, Sidi Mohamed, Département de phytotechnie, École Nationale Supérieure d’Agronomie [Alger] (ENSA), Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes (UMR Eco&Sols), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA), Université des Sciences et de la Technologie Houari Boumediène (USTHB). DZA., Institut National de la Recherche Agronomique (INRA)-Institut de Recherche pour le Développement (IRD)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), and ProdInra, Archive Ouverte

Subjects
[SDV] Life Sciences [q-bio], [SDV]Life Sciences [q-bio], food and beverages
Abstract

Legume-cereal intercropping, is a productive and sustainable system by its nutrients facilitation, and its effect to increase N uptake for intercropped cereal; via symbiotic nitrogen (N2) fixation. The aim of this work was to test effect of maize-common bean intercropping system on the growth, nodulation, yield and N uptake. This field study was conducted in Setif region, North of Algeria. The study was carried out using intercropping system with one Cvs of common bean and one maize CV which were cultivated locally by the farmers of the region. The results showed a positive correlation between the nodule and shoot dry weight, this correlation is more significant in the intercropping than sole crop. However intercropping increase maize yield by more than 12.5%, the N concentration in shoot (20.8%) and seed (33.5%); as consequence N concentration in rhizosphere soil was significantly enhanced for intercropped common bean. Intercropping advantage was observed especially; at low concentration of nitrogen in indigenous soil. We conclude that nitrogen symbiotic fixation was contributes to facilitate N uptake for intercropped maize.

Published
2014

5. Genotypic variability in nodule phosphatases activities among common bean RILs under phosphorus deficiency

Author

Lazali, Mohamed, Amenc, Laurie, Benadis, Chahinez, Abadie, Josiane, Pernot, Catherine, Ounane, Sidi Mohamed, Drevon, Jean-Jacques, Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes (UMR Eco&Sols), Institut National de la Recherche Agronomique (INRA)-Institut de Recherche pour le Développement (IRD)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Faculté Sciences Nature, Vie & Sciences de la Terre, Université de Djilali Bounaama Khemis Miliana (univ-DBKM), Labo de Production Végétale, Phytotechnie, École Nationale Supérieure d’Agronomie [Alger] (ENSA), Fabatropimed, Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), and Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)

Subjects
nodule, N2-fixing, phytase, [SDV]Life Sciences [q-bio], phaseolus vulgaris, FBPase, Common bean, RILs, transcript, phosphore
Abstract

Although interesting studies on N2-fixing legumes have demonstrated the contribution of acid phosphatases (APase) in their phosphorus use efficiency, it is still poorly understood how these enzymes are affected and distributed in bean nodules under P-deficiency. In this study, nodules of six Recombinant Inbred Lines of common bean; RILs 115, 104 and 34 (P-tolerant) and 147, 83 and 29 (P-sensitive) were induced by Rhizobium tropici CIAT899 under hydroaeroponic culture with sufficient (250 μmol P plant−1 week−1) versus deficient (75 μmol P plant−1 week−1) P supply. Phytase and Fructose 1-6 bi-phosphate phosphatase (FBPase) activities were assayed within nodules in which O2 permeability was measured. Our results showed that plant growth, nodulation and symbiotic nitrogen fixation were significantly affected by P- deficiency for all RILs, but this adverse effect was more pronounced in the RILs 147 and 83. For all RILs, the enzymes activities were significantly increased by P- deficiency, but the RILs 115, 104 and 34 maintained higher values as compared to the RILs 147, 83 and 29. Differential tissues-specific expression of phytase transcripts within nodules was detected particularly in infected zone and cortical cells. Additionally, the increased of phytase (35%) and FBPase (49%) enzyme activities under P-deficiency was associated to an increase in efficiency of the rhizobial symbiosis that was positively correlated to an increase in nodule O2 permeability. In conclusion, the variations of APase and phytase activities in nodules depend on genotype and can greatly influence the internal utilization of P, which might result in low P soil tolerance in N2-fixing legumes.

Published
2014

6. Which phosphatases may contribute to P use efficiency for N2 fixation in the rhizobial symbiosis with legumes ?

Author

Drevon, Jean-Jacques, Amenc, Laurie, Pernot, Catherine, Abadie, Josiane, Blair, Matthew, Lazali, Mohamed, Bargaz, Adnane, Ghoulam, Cherki, Ounane, Sidi Mohamed, Zaman-Allah, Mainassara, Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes (UMR Eco&Sols), Institut National de la Recherche Agronomique (INRA)-Institut de Recherche pour le Développement (IRD)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Cornell University, Swedish University of Agricultural Sciences (SLU), Faculté des Sciences et Techniques Guéliz, Université Cadi Ayyad [Marrakech] (UCA), Département de phytotechnie, École Nationale Supérieure d’Agronomie [Alger] (ENSA), International Crop Research Institute for the Semi-Arid Tropics (ICRISAT), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA), Cornell University [New York], Universidad de Sevilla. ESP., and ProdInra, Archive Ouverte

Subjects
[SDV] Life Sciences [q-bio], [SDV]Life Sciences [q-bio]
Abstract

In order to assess the contribution of phosphatases activity to P use efficiency for N2 fixation in legume nodules, an in situ RT-PCR methodology was used to localize and quantify the transcripts of candidate phosphatases genes in nodules of common bean in hydro-aeroponic culture under deficient vs sufficient P supply. The transcript localization of phytase, phosphoenolpyruvate-, fructose 1,6 bisphosphate- and trehalose 6-phosphate- phosphatases was found to be tissue specific and to differ among Pase genes, P treatment and legume genotype. It is concluded that these phosphatases contribute differently to the use of organic P for N2 fixation and the increase in nodule permeability to O2 under P deficiency.

Published
2013

7. P-deficiency increases phytase activity and O2 uptake per N2 reduced in [i]Phaseolus vulgaris[/i] L

Author

Lazali, Mohamed, Ounane, Sidi Mohamed, Bargaz, Adnane, Pernot, Catherine, Drevon, Jean-Jacques, Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes (UMR Eco&Sols), Institut National de la Recherche Agronomique (INRA)-Institut de Recherche pour le Développement (IRD)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Département de phytotechnie, École Nationale Supérieure d’Agronomie [Alger] (ENSA), Faculté des Sciences de la Nature et de la Vie & des Sciences de la Terre, Université de Djilali Bounaama Khemis Miliana (univ-DBKM), Department of Biosystems and Technology, Swedish University of Agricultural Sciences (SLU), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA), Universidad de Sevilla. ESP., and ProdInra, Archive Ouverte

Subjects
[SDV] Life Sciences [q-bio], [SDV]Life Sciences [q-bio]
Abstract

To understand the mechanisms used by legumes to improve their PUE for SNF under P-deficiency, six RILs of P. vulgaris were inoculated with Rhizobium tropici CIAT899, and grown at two levels of P supply. Our results have revealed that the increases of APases and phytases activities under P-deficiency varied among RILs of P. vulgaris and were positively correlated with increases both of the nodule conductance to O2 diffusion and the EURS. This may represent an adaptive mechanism for N2-fixing legumes to respond to low P availability, by increasing the utilization and the uptake of P for SNF.

Published
2013

8. Is the contrast between nodulated recombinant imbred lines of common bean ([i]Phaseolus vulgari[/i]s L.) linked with available phosphorus in soil? A multi-local field test in Mediterranean conditions

Author

Alkama, Nora, Jaillard, Benoît, Ounane, Sidi Mohamed, Ounane, Ghania, Drevon, Jean-Jacques, Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes (UMR Eco&Sols), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA), Département de phytotechnie, École Nationale Supérieure d’Agronomie [Alger] (ENSA), Universidad de Sevilla. ESP., Institut National de la Recherche Agronomique (INRA)-Institut de Recherche pour le Développement (IRD)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), and ProdInra, Archive Ouverte

Subjects
[SDV] Life Sciences [q-bio], [SDV]Life Sciences [q-bio], food and beverages
Abstract

In order to assess the relation between symbiotic nitrogen fixation and soil phosphorus, a multi-local test was proposed to producers of Tizi Ouzou area in Algeria, without modification of their cultivation practises. The nodulation and growth of the cultivar traditionally used by farmers, was studied with seven potentially interesting recombinant inbred lines selected among the crossing of BAT 477 and DOR 364 in addition. The sampling was performed at the flowering stage. The major finding in this work is that nodule biomasss were positively correlated with Olsen-P. Although, the curvilinear regressions of nodule biomass and shoot biomass as a function of Olsen-P suggest the existence of 2 ranges of Olsen-P among studied sites that are separated by critical P values. It is concluded that the low nodulation of the RILs was partly compensated by increasing the efficiency in use of the rhizobial symbiosis.

Published
2013

9. Effect of Maize-common bean intercropping on nitrogen uptake

Author

Latati, M., Pansu, Marc, Drevon, Jean-Jacques, Ounane, Sidi Mohamed, ProdInra, Archive Ouverte, Département de phytotechnie, École Nationale Supérieure d’Agronomie [Alger] (ENSA), Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes (UMR Eco&Sols), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA), Universidad de Sevilla. ESP., and Institut National de la Recherche Agronomique (INRA)-Institut de Recherche pour le Développement (IRD)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro)

Subjects
[SDV] Life Sciences [q-bio], [SDV]Life Sciences [q-bio]
Abstract

Legume-cereal intercropping, is a productive and sustainable system because its resource facilitation, and its effect on N input from symbiotic nitrogen fixation into the cropping system. The aim of this work was to study the effect of maize-common bean intercropping system on the growth, nodulation, crop and nutrients uptake especially nitrogen and phosphorus. The study was carried out using intercropping system with one Cvs of common bean bean and one maize CV which were cultivated locally by the farmers of the region. The results showed a positive correlation between the nodule dry weight and shoot dry weight, this correlation is more significant in the intercropping than monoculture. Moreover, intercropping increase maize yield (39.2%), the N content in the shoot (38.6%) and N in grain yield. On the other hand, in intercropping system; the N content in the soil showed a high increase at common bean rhizosphere. However, the P content in maize grain yield knows an increase (16%) under the effect of intercropping. We conclude that the nitrogen symbiotic fixation was contributes to increase nitrogen and phosphorus content and the maize yield in intercropping system.

Published
2013

10. Nodule gaz permeability and 15N discrimination during N2 fixation in contrasting[i] Phaseolus vulgaris[/i] L. lines exposed to P deficiency

Author

Lazali, Mohamed, Ounane, Sidi Mohamed, Bargaz, Adnane, Carlsson, Georg, Pernot, Catherine, Drevon, Jean-Jacques, Ecologie fonctionnelle et biogéochimie des sols et des agro-écosystèmes (UMR Eco&Sols), Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA), École Nationale Supérieure d’Agronomie [Alger] (ENSA), Biotechnologie Végétale et Agrophysiologie des Symbioses, Université Cadi Ayyad [Marrakech] (UCA), 3Department of Agricultural Research for Northern Sweden, Crop Science Section, Swedish University of Agricultural Sciences (SLU), Institut National de la Recherche Agronomique (INRA)-Institut de Recherche pour le Développement (IRD)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro), and ProdInra, Archive Ouverte

Subjects
[SDV] Life Sciences [q-bio], [SDV]Life Sciences [q-bio], food and beverages
Abstract

Background: In order to investigate environmental and genotypic variability of common bean effects on discrimination against natural atmospheric 15N, six Recombinant Inbred Lines, namely RILs 147, 115, 104, 83, 70 and 34 of common bean (Phaseolus vulgaris L.) were inoculated with Rhizobium tropici CIAT 899,and grown in hydroaeroponic culture under P sufficiency (250 μmol P plant−1 week−1) versus P deficiency (75 μmol P plant−1 week−1) conditions.[br/]Methods: At the 15 and 42 days after transplanting, plants and nodules biomasses, P and 15N contents were determined after measuring O2 uptake by nodulated roots and nodule conductance to O2 diffusion.[br/] Results: The analysis of natural abundance in 15N determined from different plant parts showed a depletion of the 15N/Nt ratio in the following order: shoots > roots > nodules. Additionally, 15N/Nt ratio was less when P wasdeficient, with differences between bean genotypes. Under P deficiency, 15N/Nt ratio decreased more in shoots (31%) than in nodules (8%). Furthermore, a significant decrease of 15N/Nt ratio was observed under P deficiency in nodules of the RILs 104 (26%) and 34 (18%) and in shoots of the RILs 147 (64%) and 104 (63%). These decreases were associated with significant variation in nodule O2 conductance among bean genotypes and P level. Moreover, positive correlations were found between nodule 15N/Nt ratio and both N2 fixed and P content innodules (r = 0.98** and r = 0.53* respectively). [br/]Conclusion: We concluded that the discrimination against 15N during N2 fixation is affected under environmental constraint such as P deficiency and varied according genotypic variability.

Published
2012

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