Defense responses to Meloidogyne exigua in resistant coffee cultivar and non-host plant

Silva, Rodrigo Vieira da; Oliveira, R. D. L.; Ferreira, Patrícia S.; Ferreira, A.O.; Rodrigues, Fabrício Á.

doi:10.1590/s1982-56762013000200004

Cited by 17 publications

(16 citation statements)

References 14 publications

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“…Similar colouration was observed in coffee resistant to M. exigua (Silva et al, 2013). Fluorescence observation in root tissues of M. graminicola-resistant O. glaberrima genotypes under UV light confirmed the presence of aromatic compounds.…”

Section: Discussionsupporting

confidence: 77%

Histopathology of the rice root-knot nematode, Meloidogyne graminicola, on Oryza sativa and O. glaberrima

Cabasan

Kumar

Bellafiore

et al. 2014

Nematol

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The root-knot nematode, Meloidogyne graminicola, can cause substantial rice yield losses. Understanding the mechanisms of resistance to this nematode species in known resistant dee genotypes may help to improve rice genotypes, aiming at developing and implementing environment-friendly and cost-effective nematode management strategies. Using susceptible and resistant rice genotypes, a comparative analysis of histological response mechanisms was made during two phases of the nematode colonisation: /) root penetration; and //) subsequent establishment and development by M. graminicola second-stage juveniles (J2). Two types of defence response mechanisms could be distinguished in the resistant rice genotypes. The early defence response consisted of a hypersensitive response (HR)-like reaction in the early stage of infection characterised by necrosis of cells directly affected by nematode feeding. This HR-like reaction was observed only in the M. graminicola-resistant Oryza glaberrima genotypes and not in the M. graminicolasusceptible O. sativa genotypes. The late defence response took place after the induction of giant cells by the J2. Giant cells usually collapsed and degenerated before J2 developed into adults. Structural features of the roots of the susceptible O. sativa showed greater root and stele diam. and cortex thickness than the resistant O. glaberrima genotypes. Desired features of plants with resistance to M. graminicola elucidated in this study can be used for selection of plants for breeding programmes.

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Section: Discussionsupporting

confidence: 77%

Histopathology of the rice root-knot nematode, Meloidogyne graminicola, on Oryza sativa and O. glaberrima

Cabasan

Kumar

Bellafiore

et al. 2014

Nematol

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“…Resistance of the C. canephora Apoatã cultivar is associated with its vigorous root system (BARBOSA, et al, 2014, VILLAIN et al, 2010. The hypersensitivity reaction and impediment to the formation of giant cells is the resistance mechanism most accepted for explaining the incompatibility of the coffee plant to the root-knot nematode (LIMA et al, 2015;SILVA et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

“…Some species of plant-parasitic nematodes cause serious damage in plantations, destroying up to 80% of the root system within five years of planting (BARROS et al, 2014;SILVA et al, 2013). Plant-parasitic nematodes have a substantial economic impact on coffee in most coffee-producing countries.…”

Section: Evaluation Of Resistance Of C Canephora Genotypes To M Incmentioning

confidence: 99%

Characterization of resistance response of Coffea canephora genotypes to Meloiddogyne incognita (Est I2) root-knot nematode

Santos

Rocha

Silveira

et al. 2018

C.Sci.

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ABSTRACT:Meloidogynose is prominent among the factors that limit yield in C. canephora in the western Amazon, Brazil. It is caused by species of "root-knot nematode"; the most important and aggressive of these species for coffee is M. incognita. The aim of this study was to assist the selection of resistant genotypes by characterizing the reaction of 32 C. canephora clones to M. incognita (Est I2). These genotypes are selected plants from the Germplasm Bank of Embrapa Rondônia of the botanical varieties Conilon, Robusta and intervarietal hybrids. The experiments were conducted under greenhouse conditions by inoculating six seedlings for each clone with 10 ml of suspension containing 5000 eggs of a pure inoculum of M. incognita. At 150 days after inoculation, evaluations were made of fresh weight of roots (FWR), total number of galls (NG), total number of eggs (NE), and the nematode reproduction factor (RF=final population/initial population). In contrast with the susceptible controls of arabica coffee (RF=1.2) and tomato plants (RF=31.3), six clones of the Conilon botanical variety, five clones of the Robusta botanical variety and eight intervarietal hybrids reacted as resistant to M. incognita, exhibiting RF<1 and a reduced number of galls (NG mean = <10). The clones identified as resistant in this study were integrated in the coffee breeding program in Rondônia for development of cultivars resistant to the root-knot nematode adapted to tropical conditions. Index terms: Coffee, meloidogynose, plant selection, plant breeding, Rondônia. Caracterização da resposta de resistência de genótipos de Coffea canephora ao Nematoide-das-Galhas Meloidogyne incognita (Est I2)RESUMO: Entre os fatores que limitam a produtividade do C. canephora na Amazônia Ocidental destaca-se a meloidogynose, causada por espécies do "Nematoide-das-Galhas", dentre as quais a mais importante e agressiva ao cafeeiro é M. incognita. O objetivo desse trabalho foi caracterizar a resistência à M. incognita (Est I2) de 32 genótipos das variedades botânicas Conilon, Robusta e híbridos intervarietais provenientes do Banco de Germoplasma da Embrapa Rondônia. Os experimentos foram realizados em casa de vegetação com a inoculação de seis mudas para cada clone com 10 ml de suspensão contendo 5000 ovos de inóculo puro de M. incognita. Cento e cinquenta dias após a inoculação foram avaliados o peso fresco (PF), o número de galhas (NG), o número de ovos (NO) e o fator de reprodução do nematoide (FR= população final/população inicial). Em comparação com as testemunhas suscetíveis de café arábica e do tomateiro (FR=1,2 e 31,3, respectivamente), os clones da variedade botânica Conilon (694, 160, 837, 46, 909, 890), da variedade botânica Robusta (1111, 8152, 8192, 10141, 8152) e os materiais híbridos (844, 1005, 169, 54, 453, 120, 193, 636) reagiram como resistentes à M. incognita, apresentando FR<1 e reduzido número de galhas (NG médio = <10). Os clones identificados como resistentes foram integrados ao programa de melhoramento genético do cafeeiro visando o ...

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“…al., 1977). In this case, the decrease in the nematode reproduction, even with symptomatic galls, can be explained by postinfection resistance (Salgado et al, 2005;Silva et al, 2013). In addition, this phenomenon is genetically controlled (Roberts et al, 2008).…”

Section: Screening Assaysmentioning

confidence: 96%

Genetic Gain in the Resistance of Arabica Coffee Progenies to Root‐Knot Nematode

et al. 2017

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The nematode Meloidogyne exigua infests Arabica coffee (Coffea arabica L.) plants, leading to severe growth reduction in young trees and decreased bean yield. We investigated the responses of coffee plants to this nematode and estimated the genetic gain in progenies derived from the cross between the cultivar Catuaí and the Timor hybrid. We evaluated 85 F4:5 progenies; the cultivars Mundo Novo IAC 379‐19 and Catuaí Vermelho IAC 99 were used as susceptible controls, and Paraíso MG H 419‐1 and IPR 100 were used as resistant controls. Progeny responses were evaluated using the gall index (GI), reproduction factor (RF), reproduction factor reduction (RFR), and number of eggs and juveniles (J2) per gram of roots (NEJGR). The cultivars IPR 100 and Paraíso MG H 419‐1 and 75 progenies were resistant to M. exigua. Little or no segregation for resistance was observed within the progenies, indicating potential homozygosity at this locus. The GI, RF, RFR, and NEJGR showed high genotypic correlation. The correlated response of decreased NEJGR when selected indirectly by GI was higher than that by direct selection. The GI scale allowed genetic gain to decrease the nematode population and increase resistance; therefore, it can be used as a selection criterion. Linear regression showed that the NEJGR mean was reduced by a value of 450 per selection cycle, which led to a change in the phenotypic mean and explained 95% of the variation. Thus, successive selection cycles could prevent nematode development in coffee tree roots.

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Defense responses to Meloidogyne exigua in resistant coffee cultivar and non-host plant

Cited by 17 publications

References 14 publications

Histopathology of the rice root-knot nematode, Meloidogyne graminicola, on Oryza sativa and O. glaberrima

Histopathology of the rice root-knot nematode, Meloidogyne graminicola, on Oryza sativa and O. glaberrima

Characterization of resistance response of Coffea canephora genotypes to Meloiddogyne incognita (Est I2) root-knot nematode

Genetic Gain in the Resistance of Arabica Coffee Progenies to Root‐Knot Nematode

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