Data/hora: 21/06/2024 15:10:37

Biblioteca(s): | Embrapa Arroz e Feijão; Embrapa Recursos Genéticos e Biotecnologia.
Data corrente: | 16/09/2019
Data da última atualização: | 12/02/2020
Autoria: | MATTOS, V. da S.; LEITE, R. R.; CARES, J. E.; GOMES, A. C. M. M.; MOITA, A. W.; LOBO, V. L. S.; CARNEIRO, R. M. D. G.
Afiliação: | VANESSA DA SILVA MATTOS; RAYCENNE ROSA LEITE, UNB; JUVENIL ENRIQUE CARES, UNB; ANA CRISTINA MENESES M GOMES, Cenargen; ANTONIO WILLIAM MOITA; VALACIA LEMES DA SILVA LOBO, CNPAF; REGINA MARIA DECHECHI G CARNEIRO, Cenargen.
Título: | Oryza glumaepatula, a new source of resistance to Meloidogyne graminicola and histological characterization of its defense mechanisms.
Ano de publicação: | 2019
Fonte/Imprenta: | Phytopathology, v. 109, n. 11, p. 1941-1948, Nov. 2019.
ISSN: | 0031-949X
DOI: | 10.1094/PHYTO-02-19-0044-R
Idioma: | Inglês
Conteúdo: | Meloidogyne graminicola causes significant damage to rice fields worldwide. Sources of resistance to M. graminicola reported in Oryza sativa are limited. Resistance to this species has been found in other Oryza species such as O. glaberrima and O. longistaminata. This study aimed to evaluate the reaction of four wild species of Oryza from the Embrapa Rice and Bean Germplasm Bank (Goiás, Brazil) to a pool of M. graminicola populations and determine the resistance mechanism in O. glumaepatula. Two genotypes of O. glaberrima, one of O. alta, three of O. glumaepatula, one of O. grandiglumis, one of O. longistaminata, and one of O. sativa (control) were included in the study. The results showed that O. glumaepatula was highly resistant (reproduction factor [RF] < 1). O. glaberrima, O. alta, and O. grandiglumis were considered moderately resistant. O. longistaminata was susceptible, although values of RF remained lower than the control O. sativa 'BR-IRGA 410', considered highly susceptible. Histological observations on the interaction of O. glumaepatula and M. graminicola showed reduced penetration of second-stage juveniles (J2s) when this resistant wild accession was compared with O. sativa. An intense hypersensitivity response-like reaction occurred at 2 days after inoculation in the root cortex of the resistant accession. Few J2s established in the central cylinder, and rare collapsed giant cells were observed surrounded by degenerate females. Fluorescence microscopy in O. glumaepatula revealed giant cells and the female body presumably exhibiting accumulation of phenolic compounds. Our study suggests that wild rice accessions, especially from the AA genotype (e.g., O. glumaepatula), are of great interest for use in future breeding programs with Oryza spp.
Palavras-Chave: | Genetics and Resistance; Population Biology.
Thesagro: | Arroz; Meloidogyne spp; Nematóide; Oryza Sativa.
Thesaurus Nal: | Hypersensitivity; Nematology; Rice; Root-knot nematodes.

Categoria do assunto:

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H Saúde e Patologia

Registro original: | Embrapa Arroz e Feijão (CNPAF)

Exemplares:

CENARGEN - (37830-1) - UPC - AP - DD -  -  -  - DIS
CNPAF - (35629-1) - UPC - AP - DD - 2019 -  - 2019 - DIS