MGS Guaiçara and MGS Vereda: Coffea arabica cultivars resistant to the root-knot nematode Meloidogyne paranaensis

Salgado, Sônia Maria de Lima; Fatobene, Bárbhara Joana dos Reis; Pereira, Antônio Alves; Rezende, Juliana Costa de; Botelho, César Elias; Carvalho, Gladyston Rodrigues; Oliveira, A. C. B. de; Ferreira, André Dominghetti; Figueiredo, Vanessa; Vilela, Danielle Marques; Luz, Silvana Ramlow Otto Teixeira da; Andrade, Vinícius Teixeira

doi:10.1590/1984-70332022v22n3c29

Cited by 2 publications

(1 citation statement)

References 12 publications

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“…There is variation in the symptomatology due to parasitism of species of Meloidogyne to coffee tree roots (Salgado;Terra, 2022). However, few studies demonstrate this variation, especially between Mex and Mpar, the species commonly found in coffee fields.…”

Section: Introductionmentioning

confidence: 99%

Population and initial parasitic characterization of Meloidogyne exigua and Meloidogyne paranaensis on coffee trees

Guimarães,

Teixeira,

Salgado

et al. 2024

CLCS

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The diverse endophytic stages of the life cycle of species of the Meloidogyne genus are related to parasitism in the host plant. In this study, the objective was to analyze Meloidogyne exigua (Mex) and Meloidogyne paranaensis (Mpar) in roots of coffee trees, through quantification of life cycle phases and characterization by scanning electron microscopy (SEM) the initial symptoms at 4, 7, 10, 17, 24, 31, 38 and 45 days after inoculation (DAI). The vermiform J2 stage of Mex was observed until 17 DAI, with populational variation among coffee trees. The same phase with Mpar was observed until 7 DAI, without populational differences flutuaction in Mex sausage-shaped J2 population was observed between 17 and 31 DAI and intensified for the and juveniles of the third and fourth stages (J3/J4) with reduction in the final of this period on Apoatã and IPR 100. The sausage-shaped stage of Mpar was observed at 10 DAI and J3/J4 at 17 DAI, with a higher population in Mundo Novo coffee trees. At the end of the cycle, the female population with eggs of Mex was higher in the Mundo Novo and genotype 2, and the formation of young females with eggs of Mpar was low in all coffee trees except for cv. Mundo Novo. The symptomatology of Mpar and Mex was evidenced by longitudinal cracks in the roots with Mpar and rounded galls, an apparent mass of eggs on the roots with Mex at 45 DAI.

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Section: Introductionmentioning

confidence: 99%

Population and initial parasitic characterization of Meloidogyne exigua and Meloidogyne paranaensis on coffee trees

Guimarães,

Teixeira,

Salgado

et al. 2024

CLCS

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Inheritance of Resistance to Bacterial Halo Blight and Bacterial Leaf Spot in Arabica Coffee

Rodrigues,

Andrade,

Destéfano

et al. 2023

Plant Disease

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Developing coffee cultivars resistant to multiple diseases by combining resistance genes is a top priority in breeding programs. To create cultivars resistant to diseases and nematodes, we transferred genes for resistance to bacterial infections caused by Pseudomonas coronafaciens pv. garcae, which causes bacterial halo blight (BHB), and P. amygdali pv. tabaci, which causes bacterial leaf spots (BLS), into Arabica coffee. Genetic analyses were conducted on breeding populations to estimate the number and function of genes that confer resistance to BHB and BLS. In total, 2109 plants in the F2 generation and reciprocal backcrosses were inoculated with P. coronafaciens pv. garcae, while 1996 plants were inoculated with P. amygdali pv. tabaci. Results showed that resistance to both pathogens had a heritability of 0.99, and the segregations of resistance indicated that each disease was controlled by a single dominant gene. The analyses also revealed that the resistance genes for BHB and BLS were linked, with an average distance of 10.75 cM between them on the same chromosome.

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MGS Guaiçara and MGS Vereda: Coffea arabica cultivars resistant to the root-knot nematode Meloidogyne paranaensis

Cited by 2 publications

References 12 publications

Population and initial parasitic characterization of Meloidogyne exigua and Meloidogyne paranaensis on coffee trees

Population and initial parasitic characterization of Meloidogyne exigua and Meloidogyne paranaensis on coffee trees

Inheritance of Resistance to Bacterial Halo Blight and Bacterial Leaf Spot in Arabica Coffee

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