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13. Herbaspirillum

Author

Matteoli, Filipe Pereira, primary, Olivares, Fabio Lopes, additional, Venancio, Thiago Motta, additional, Oliveira da Rocha, Letícia, additional, Souza da Silva Irineu, Luiz Eduardo, additional, and Canellas, Luciano Pasqualoto, additional

Published
2020
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21. Multiomic Approaches Reveal Hormonal Modulation and Nitrogen Uptake and Assimilation in the Initial Growth of Maize Inoculated with Herbaspirillum seropedicae

Author

Irineu, Luiz Eduardo Souza da Silva, primary, Soares, Cleiton de Paula, additional, Soares, Tatiane Sanches, additional, Almeida, Felipe Astolpho de, additional, Almeida-Silva, Fabrício, additional, Gazara, Rajesh Kumar, additional, Meneses, Carlos Henrique Salvino Gadelha, additional, Canellas, Luciano Pasqualoto, additional, Silveira, Vanildo, additional, Venancio, Thiago Motta, additional, and Olivares, Fabio Lopes, additional

Published
2022
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28. Influence of land use and different plant residues on isotopic carbon distribution of total and water extractable organic matter in an incubation experiment with weathered tropical soil.

Author

da Silva, Silézio Ferreira, Spaccini, Riccardo, de Rezende, Carlos Eduardo, and Canellas, Luciano Pasqualoto

Subjects
CARBON content of water, PLANT residues, CARBON isotopes, WATER distribution, SOIL amendments
Abstract

In weathered tropical soils, the inherent pedoclimatic characteristics strengthen the role of soil organic matter (SOM) pools within the carbon cycle for both forest and agricultural ecosystems. The fast SOM turnover and the humid climate hasten the impact of land use and emphasize the importance of water extractable organic matter (WEOM) on soil organic carbon (SOC) dynamics. The goal of this study was to determine the short‐term dynamics of bulk SOM and WEOM pool in weathered Brazilian soil, as conditioned by both land use and type of plant inputs. To this aim we used the appraisal of the natural δ13C‐OC signature to follow the variation of SOC pools and to overcome the analytical issues related to low OC concentration of WEOM fractions. In a one‐year laboratory incubation, soil samples from a natural forest and an adjacent site under sugarcane monoculture were amended with either forest litter or sugarcane straw to evaluate SOM and WEOM dynamics. The bulk SOM was mainly affected by inherited conditions rather than on the organic amendments. The incorporation of sugarcane residues in the forest site produced a partial replacement of the original SOC, while the amendments to the cultivated soil promoted a stable increase in SOC. The analysis of WEOM highlighted its influence as a reactive pool in the short‐term SOM dynamics. The δ13C variation of WEOM from cultivated soil corroborated the significant ponderal rate of OC input from forest litter that accounted for 22% of total dissolved carbon. Unexpected evidence on the shift of isotopic dilution between SOC pools indicates that the evaluation of δ13C to determine the origin of the SOC fraction should be conservatively adopted. The results outline that the steady state of SOM in forest systems may undergo a rapid decline with limited counteracting effects of exogenous OM inputs. Conversely, OC depleted agricultural soils may benefit from organic amendments, thus acting as an effective sink for SOC accumulation. [ABSTRACT FROM AUTHOR]

Published
2023
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37. Multiomic Approaches Reveal Hormonal Modulation and Nitrogen Uptake and Assimilation in the Initial Growth of Maize Inoculated with Herbaspirillum seropedicae.

Author

Irineu, Luiz Eduardo Souza da Silva, Soares, Cleiton de Paula, Soares, Tatiane Sanches, Almeida, Felipe Astolpho de, Almeida-Silva, Fabrício, Gazara, Rajesh Kumar, Meneses, Carlos Henrique Salvino Gadelha, Canellas, Luciano Pasqualoto, Silveira, Vanildo, Venancio, Thiago Motta, and Olivares, Fabio Lopes

Subjects
KREBS cycle, ENDOPHYTIC bacteria, MICROBIAL inoculants, METABOLISM, SUSTAINABLE development, EXCITATORY amino acids, NITROGEN, CORN
Abstract

Herbaspirillum seropedicae is an endophytic bacterium that can fix nitrogen and synthesize phytohormones, which can lead to a plant growth-promoting effect when used as a microbial inoculant. Studies focused on mechanisms of action are crucial for a better understanding of the bacteria-plant interaction and optimization of plant growth-promoting response. This work aims to understand the underlined mechanisms responsible for the early stimulatory growth effects of H. seropedicae inoculation in maize. To perform these studies, we combined transcriptomic and proteomic approaches with physiological analysis. The results obtained eight days after inoculation (d.a.i) showed increased root biomass (233 and 253%) and shoot biomass (249 and 264%), respectively, for the fresh and dry mass of maize-inoculated seedlings and increased green content and development. Omics data analysis, before a positive biostimulation phenotype (5 d.a.i.) revealed that inoculation increases N-uptake and N-assimilation machinery through differentially expressed nitrate transporters and amino acid pathways, as well carbon/nitrogen metabolism integration by the tricarboxylic acid cycle and the polyamine pathway. Additionally, phytohormone levels of root and shoot tissues increased in bacterium-inoculated-maize plants, leading to feedback regulation by the ubiquitin-proteasome system. The early biostimulatory effect of H. seropedicae partially results from hormonal modulation coupled with efficient nutrient uptake-assimilation and a boost in primary anabolic metabolism of carbon–nitrogen integrative pathways. [ABSTRACT FROM AUTHOR]

Published
2023
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39. Additional file 1 of Acclimation with humic acids enhances maize and tomato tolerance to salinity

Author

Souza, Aline Costa, Zandonadi, Daniel Basílio, Santos, Mirella Pupo, Canellas, Natália Oliveira Aguiar, de Paula Soares, Cleiton, da Silva Irineu, Luiz Eduardo Souza, de Rezende, Carlos Eduardo, Spaccini, Riccardo, Piccolo, Alessandro, Olivares, Fabio Lopes, and Canellas, Luciano Pasqualoto

Abstract

Additional file 1: Table S1. Primer sequence of the genes analysed by RT-qPCR. Table S2. Genes related to osmotic stress (drought/salinity) in the acclimation period in a significant differential expression (in respect to control) in maize root seedlings treated with humic acids. Figure S1. CP/MAS 13C NMR spectrum of humic-like acids (HA) isolated from vermicompost produced with sugarcane filter cake residue. Figure S2. NaCl stress-signalling pathways and interactions with humic acids. The stress signal is perceived by a salt sensor present at the plasma membrane. The signal is responsible for kinases activation, including ones that participated in SOS pathways. The kinases were correlated to induced pumps/channels and transcription factors expression (NAC and bZIP family). Activation of Na2+/H+ antiporter (SOS1, vacuolar Na+/H+ antiporter (NHX) was correlated to tolerance to salt stress. Na2+ exclusion (to apoplast) or compartmentalizing (vacuole) is powered by electrochemical gradient generated by H+-ATPase or H+-PPase. The proton electrochemical gradient generated by plasma membrane H+-ATPase results in antiporters ions coupling (antiport K+/Na+). Sodium (Na2+) can enter the cell through voltage independent nonselective cation channels like HKT, generating membrane depolarization. Both depolarization of membrane and changes in turgor pressure affect kinases pathways, and increased Ca2+ cytoplasmic concentration, resulting in vacuolar two pore channel 1 (TPC1) activation, which in turn also increases cytoplasmic Ca2+. High cytosolic Ca2+ activates, among others calcium-binding, calmodulin (CDKs), and was also related to HKT activation. Cytosolic Ca2+ signal is sensed by an SnRK3/calcineurin B-like (CBL) calcium-binding protein complex (SOS3/SOS2) which activates SOS1. Humic acids (HA) increased cytosolic Ca2+, proton pumps, and transcription factors related salt stress responses, such as bZIP and NAC. NAC transcription factor is associated to auxin pathway. SnRK1 regulates carbon metabolism by direct phosphorylation or redox activation or inactivation of metabolic enzymes like nitrate reductase (NR). The SnRK1 activated SnRK2 by Abscisic acid (ABA)-dependent signalling pathways which, in turn, activates AREBPs inducing gene expression. Abscisic acid can also induce SOS3. Enzymes or transcripts evaluated in this work are in cyan.

Published
2021
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44. Interaction between humic substances and plant hormones for phosphorous acquisition

Author

Jindo, Keiji, Canellas, Luciano Pasqualoto, Albacete, Alfonso, Dos Santos, Lidiane Figueiredo, Frinhani Rocha, Rafael Luiz, Baia, Daiane Carvalho, Aguiar Canellas, Natália Oliveira, Goron, Travis Luc, Olivares, Fábio Lopes, Jindo, Keiji, Canellas, Luciano Pasqualoto, Albacete, Alfonso, Dos Santos, Lidiane Figueiredo, Frinhani Rocha, Rafael Luiz, Baia, Daiane Carvalho, Aguiar Canellas, Natália Oliveira, Goron, Travis Luc, and Olivares, Fábio Lopes

Abstract

Phosphorus (P) deficiency is a major constraint in highly weathered tropical soils. Although phosphorous rock reserves may last for several hundred years, there exists an urgent need to research efficient P management for sustainable agriculture. Plant hormones play an important role in regulating plant growth, development, and reproduction. Humic substances (HS) are not only considered an essential component of soil organic carbon (SOC), but also well known as a biostimulant which can perform phytohormone-like activities to induce nutrient uptake. This review paper presents an overview of the scientific outputs in the relationship between HS and plant hormones. Special attention will be paid to the interaction between HS and plant hormones for nutrient uptake under P-deficient conditions.

Published
2020

45. From Lab to Field: Role of Humic Substances Under Open-Field and Greenhouse Conditions as Biostimulant and Biocontrol Agent

Author

Jindo, Keiji, Olivares, Fábio Lopes, da Paixão Malcher, Deyse Jacqueline, Sánchez-Monedero, Miguel Angel, Kempenaar, Corné, Canellas, Luciano Pasqualoto, Jindo, Keiji, Olivares, Fábio Lopes, da Paixão Malcher, Deyse Jacqueline, Sánchez-Monedero, Miguel Angel, Kempenaar, Corné, and Canellas, Luciano Pasqualoto

Abstract

The demand for biostimulants has been growing at an annual rate of 10 and 12.4% in Europe and Northern America, respectively. The beneficial effects of humic substances (HS) as biostimulants of plant growth have been well-known since the 1980s, and they can be supportive to a circular economy if they are extracted from different renewable resources of organic matter including harvest residues, wastewater, sewage sludge, and manure. This paper presents an overview of the scientific outputs on application methods of HS in different conditions. Firstly, the functionality of HS in the primary and secondary metabolism under stressed and non-stressed cropping conditions is discussed along with crop protection against pathogens. Secondly, the advantages and limitations of five different types of HS application under open-fields and greenhouse conditions are described. Key factors, such as the chemical structure of HS, application method, optimal rate, and field circumstances, play a crucial role in enhancing plant growth by HS treatment as a biostimulant. If we can get a better grip on these factors, HS has the potential to become a part of circular agriculture.

Published
2020

49. Conventional farming disrupts cooperation among phosphate solubilising bacteria isolated from Carica papaya’s rhizosphere

Author

Melo, Juliana, primary, Carvalho, Luís, additional, Correia, Patrícia, additional, de Souza, Sávio Bastos, additional, Dias, Teresa, additional, Santana, Margarida, additional, Carolino, Manuela, additional, Aguiar, Natália O., additional, Canellas, Luciano Pasqualoto, additional, Cruz, Cristina, additional, and Ramos, Alessandro Coutinho, additional

Published
2018
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50. Soil Organic Matter Quality From Soils Cropped by Traditional Peasants

Author

Canellas, Luciano Pasqualoto, Aguiar, Natalia De Oliveira, Vega, Maria Raquel Garcia, Olivares, Fabio Lopes, SPACCINI, RICCARDO, Canellas, Luciano Pasqualoto, Spaccini, Riccardo, Aguiar, Natalia De Oliveira, Vega, Maria Raquel Garcia, and Olivares, Fabio Lopes

Subjects
Agronomy, Soil test, Oxisol, Soil organic matter, Soil water, Environmental science, Soil classification, Soil fertility, Soil quality, Humus
Abstract

In this work we have analyzed soil samples from Oxisols collected from two traditional communities, one formed by Guarany Indians at South of Brazil and other by African descendants on North of Rio de Janeiro State, Brazil. The content and fractional composition of humus was investigated and the isolated humic acids (HAs) were characterized by elemental composition, 13C solid-state nuclear magnetic resonance, and high-performance size exclusion chromatography. The bioactivity of HAs was evaluated considering the effects on root growth of maize seedlings. Chemical properties from adjacent soils under native forest were used as control samples. The local field sites matching the traditional cropping requirements, were characterized by higher soil chemical fertility and soil organic matter hydrophobicity, as compared to the land plots considered as inadequate by rural peasants. The HAs from cropped soils revealed significant differences in respect to content, hydrophobicity, biostimulation and molecular dimension. Although all humic extracts promoted, both, root growth and the stimulation of lateral root emergence over control, the HAs from preferential local sites, revealed a larger bioactivity response on root stimulation even at lower concentration. The assessment of soil quality issued by local farmers, showed a valuable fitting with bio-chemical fertility indicators and SOM hydrophobicity.

Published
2014

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