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Start Over Author "Leandro de Souza Rocha" Publisher universidade federal rural do semi-arido
4 results on '"Leandro de Souza Rocha"'

1. REACTION OF Crambe abyssinica TO Meloidogyne javanica AND M. incognita RACE 3

Author

Rafael Assis de Souza, Regina Cássia Ferreira Ribeiro, Leandro de Souza Rocha, Adelica Aparecida Xavier, Isac Pereira Soares Martins, and Fabíola de Jesus Silva

Subjects
Agriculture, Biology (General), QH301-705.5
Abstract

Several oilseed plants have been researched for biodiesel production in Brazil, and Crambe abyssinica Hochst is one of the most promising species. The effect of the phytonematodes M. incognita race 3 and Meloidogyne javanica on C. abyssinica plants was evaluated in greenhouse experiments. A randomized block design with five nematode inoculum levels (350, 700, 1400, 2800, and 5600 eggs) and ten replications was used. C. abyssinica plants without inoculation were used as controls, and the viability of the nematodes used was tested in tomato plants inoculated with 2000 eggs. The plots consisted of pots containing one plant. The number of root knots (NG), number of egg masses (NEM), and number of eggs + second-stage juveniles (NEJ2) per root system, number of J2 per 200 cm3 of soil (NJ2), and shoot dry weight (SDW) of the inoculated C. abyssinica plants were evaluated at 45 days after inoculation. The reproduction factor (RF) of the nematodes was also evaluated. The resistance of the plants to the phytonematodes was classified using the RF criterion. Crambe abyssinica plants are susceptible to the different inoculum levels of Meloidogyne javanica and M. incognita used, and the data of all nematode variables (NG, NEM, NEJ2, NJ2, and RF) were fitted by linear models.

Published
2019
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2. REACTION OF BANANA CULTIVARS TO THE Meloidogyne javanica X Fusarium oxysporum f. sp. cubense COMPLEX

Author

LEANDRO DE SOUZA ROCHA, ROBERT FELIX DE SANTANA, ANA CRISTINA FERMINO SOARES, and FERNANDO HADDAD

Subjects
Agriculture, Biology (General), QH301-705.5
Abstract

The interaction Fusarium oxysporum f. sp. cubense (Foc) x nematode and the genetic variability of Foc are the main problems with potential to affect the use of resistant varieties in the management of the Panama disease. The objective of this work was to evaluate the interaction between Foc and Meloidogyne javanica on the banana of the Prata Anã, Grande Naine and BRS Princesa cultivars. The experiment was conducted in a randomized block design, with six treatments and ten replications, which differed in the inoculation time of each pathogen. Simultaneous inoculation with Foc and M. javanica, inoculation with Foc one week before inoculation with M. javanica, and inoculation with M. javanica one week before inoculation with Foc. In addition to the controls, Foc isolated, M. javanica isolated, and cultivars without the pathogens. The seedlings were transplanted in 3-liter pots with sterile soil infested with 40 grams of Foc inoculum at the concentration of 1x106CFU/gram and 1000 eggs and J2 of M. javanica. At the end of 56 days, the treatments with 'Grande Naine' presented the highest reproduction factors of M. javanica. In the 'Prata Anã' no interaction was observed between Foc x M. javanica. The treatments with simultaneous inoculation of the two pathogens, and with Foc a week before, in the 'BRS Princesa', presented the highest external disease indices (DI), which promoted the highest AUDPC. The highest internal DI were observed in the treatments Foc+Mj+Grande Naine, Foc+Mj+BRS Princesa, Mj+Grande Naine+Foc and Foc+BRS Princesa+Mj. The simultaneous presence of M. javanica and Foc increases the severity of the Panama disease in Grande Naine and BRS Princesa cultivars.

Published
2018
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3. REACTION OF PASSION FRUIT GENOTYPES TO THE COMPLEX Meloidogyne incognita AND Fusarium solani

Author

Leandro de Souza Rocha, Regina Cássia Ferreira Ribeiro, and Adelica Aparecida Xavier

Subjects
Collar rot, Fusarium, Root-knot nematode, Genótipos, biology, Root-knot nematode. Resistance. Collar rot. Genotypes. Passiflora spp, Resistance, Genotypes, Sowing, Passiflora spp, biology.organism_classification, Passiflora, Nematoide das galhas, Horticulture, Nematoide das galhas. Resistência. Podridão do colo. Genótipos. Passiflora spp, Genotype, Meloidogyne incognita, Podridão do colo, Resistência, General Agricultural and Biological Sciences, Fusarium solani
Abstract

The interaction between Meloidogyne and Fusarium can alter the resistance behavior of passion fruit genotypes. The study was aimed to evaluate the reaction of genotypes of Passiflora spp. to Meloidogyne incognita race 3 (Mi)-Fusarium solani (Fs) complex. The assay was carried using RBD in the factorial arrangement: 10 genotypes (BRS-SC, M-19-UFV, P. alata, P. nitida, P. giberti, P.setacea, P. mucronata, P. murifolia, P. cincinnata, P. ligularis) x 3 treatments (Mi, Mi+Fs, Fs). After 180 days of planting the reaction to Mi was determined by RF (Pi/Pf) and to Fs by lesions size in roots and stems. According to the criteria of Oostenbrink and Moura and Regis, BRS-SC, M-19-UFV. P. alata and P. cincinnata behaved as resistant and P. giberti as susceptible. According to the Taylor and Sasser, BRS-SC, M-19-UFV, P. alata, P. cincinnata and P. giberti behaved as resistant, moderately resistant, moderately suscetible and susceptible, respectively. Lower percentage of plants with symtoms of Fs was found in P. mucronata, P. nitida, P. setacea, P. cincinnata and M-19-UFV In the presence of both pathogens, M-19-UFV, P. alata and P. nitida were those with larger lesion. In the presence de Fs, BRS-SC, P. alata, P. cincinnata and P. ligularis showed the largest lesions. A interação Meloidogyne-Fusarium pode alterar o comportamento de resistência de genótipos de maracujazeiro. Objetivou-se, neste trabalho avaliar a reação de genótipos de Passiflora ao complexo Meloidogyne incognita raça 3 e Fusarium solani. O experimento foi conduzido em DBC com esquema fatorial 10x3, sendo dez genótipos de Passiflora, (híbrido BRS Sol do Cerrado, seleção-M-19 da UFV, P. alata, P. nitida, P. giberti, P. setacea, P. mucronata, P. morifolia, P. cincinnata e P. ligularis e três tratamentos, M. incognita raça 3, M. incognita + Fusarium solani e F. solani. Após 180 dias do plantio e inoculação dos patógenos, avaliou-se a reação a M. incognita por meio do fator de reprodução- (FR = Pi/Pf) e variáveis nematológicas e a reação a F. solani pelo tamanho das lesões nas raízes e caules. De acordo com os critérios de Oostenbrink e de Moura e Regis, ‘BRS-Sol do Cerrado’, M-19-UFV, P. alata e P. cincinnata foram resistentes e P. giberti foi suscetível a M. incognita raça 3. De acordo com Taylor e Sasser, ‘BRS-Sol do Cerrado’, M-19-UFV, P. alata, P. cincinnata e P. giberti foram resistente, moderadamente, moderadamente suscetível e suscetível, respectivamente, ao nematoide. Menores porcentagens de plantas com sintomas de Fusarium foi encontrada em P. mucronata, P. nitida, P. setacea, P. cincinnata e M-19-UFV. Na presença de ambos os patógenos, M-19-UFV, P. alata e P. nitida foram os que apresentaram maior tamanho de lesão. Na presença de F. solani,‘BRS-Sol do Cerrado’, P. alata, P. cincinnata e P. ligularis apresentaram as maiores lesões causadas pelo fungo.

Published
2021

4. REAÇÃO DE CULTIVARES DE BANANEIRA AO COMPLEXO Meloidogyne javanica X Fusarium oxysporum f. sp. cubense

Author

Leandro de Souza Rocha, Fernando Haddad, Robert Felix De Santana, and Ana Cristina Fermino Soares

Subjects
0106 biological sciences, Panama disease, Randomized block design, Biology, 01 natural sciences, Musa spp.. Murcha de Fusarium. Nematoides das galhas. Interação. Mal-do-Panamá, lcsh:Agriculture, Fusarium oxysporum, Cultivar, lcsh:QH301-705.5, Inoculation, fungi, lcsh:S, food and beverages, Fusarium oxysporum f.sp. cubense, 04 agricultural and veterinary sciences, biology.organism_classification, Horticulture, Nematode, lcsh:Biology (General), 040103 agronomy & agriculture, 0401 agriculture, forestry, and fisheries, General Agricultural and Biological Sciences, Musa spp.. Fusarium wilt. Root-knot nematodes. Interaction. Panama disease, Meloidogyne javanica, 010606 plant biology & botany
Abstract

The interaction Fusarium oxysporum f. sp. cubense (Foc) x nematode and the genetic variability of Foc are the main problems with potential to affect the use of resistant varieties in the management of the Panama disease. The objective of this work was to evaluate the interaction between Foc and Meloidogyne javanica on the banana of the Prata Anã, Grande Naine and BRS Princesa cultivars. The experiment was conducted in a randomized block design, with six treatments and ten replications, which differed in the inoculation time of each pathogen. Simultaneous inoculation with Foc and M. javanica, inoculation with Foc one week before inoculation with M. javanica, and inoculation with M. javanica one week before inoculation with Foc. In addition to the controls, Foc isolated, M. javanica isolated, and cultivars without the pathogens. The seedlings were transplanted in 3-liter pots with sterile soil infested with 40 grams of Foc inoculum at the concentration of 1x106CFU/gram and 1000 eggs and J2 of M. javanica. At the end of 56 days, the treatments with 'Grande Naine' presented the highest reproduction factors of M. javanica. In the 'Prata Anã' no interaction was observed between Foc x M. javanica. The treatments with simultaneous inoculation of the two pathogens, and with Foc a week before, in the 'BRS Princesa', presented the highest external disease indices (DI), which promoted the highest AUDPC. The highest internal DI were observed in the treatments Foc+Mj+Grande Naine, Foc+Mj+BRS Princesa, Mj+Grande Naine+Foc and Foc+BRS Princesa+Mj. The simultaneous presence of M. javanica and Foc increases the severity of the Panama disease in Grande Naine and BRS Princesa cultivars. A interação Fusarium oxysporum f. sp. cubense (Foc) x nematoide e a variabilidade genética de Foc são os principais problemas com potencial de afetar o uso de variedades resistentes no manejo do mal-do-Panamá. O objetivo do trabalho foi avaliar a interação entre Foc e Meloidogyne javanica sobre as cultivares de bananeiras, Prata Anã, Grande Naine e BRS Princesa. O experimento foi conduzido em DBC, com seis tratamentos e dez repetições, os quais se diferenciaram no tempo de inoculação de cada patógeno. Inoculação simultânea de Foc e M. javanica, inoculação de Foc uma semana antes de M. javanica e inoculação de M. javanica uma semana antes de Foc. Além dos controles, Foc isolado, M. javanica isolado e cultivares sem patógenos. As mudas foram transplantadas em vasos de três litros com solo estéril infestado com 40 gramas de inóculo de Foc na concentração de 1x106UFC/grama e 1000 ovos e J2 de M. javanica. Ao final de 56 dias, os tratamentos em ‘Grande Naine’ apresentaram os maiores fatores de reprodução de M. javanica. Em ‘Prata Anã’ não foi observado interação entre Foc x M. javanica. Os tratamentos com inoculação simultânea dos dois patógenos e com Foc uma semana antes, em ‘BRS Princesa’, apresentaram os maiores índices de doença (ID) externos, o que proporcionou as maiores AACPD. Os maiores ID internos foram observados nos tratamentos, Foc+Mj+Grande Naine, Foc+Mj+BRS Princesa, Mj+Grande Naine+Foc e Foc+BRS Princesa+Mj. A presença conjunta de M. javanica e Foc aumenta a severidade do mal-do-Panamá nas cultivares Grande Naine e BRS Princesa.

Published
2018

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