Data/hora: 24/06/2024 23:39:15

Biblioteca(s): | Embrapa Clima Temperado; Embrapa Recursos Genéticos e Biotecnologia.
Data corrente: | 07/10/2021
Data da última atualização: | 21/12/2021
Autoria: | MATTOS, V. S.; LEITE, R. R.; SANTOS, M. F. A.; GOMES, C. B.; CASTAGNONE-SERENO, P.; CARES, J. E.; CARNEIRO, R. M. D. G.
Afiliação: | VANESSA S. MATTOS; RAYCENNE R. LEITE, UNB; MARCILENE F. A. SANTOS; CESAR BAUER GOMES, CPACT; PHILIPPE CASTAGNONE-SERENO, Université Côte d'Azur, France; JUVENIL E. CARES, UNB; REGINA MARIA DECHECHI G CARNEIRO, Cenargen.
Título: | Genetic diversity of Meloidogyne spp. from rice and identification of multiresistant sources in Oryza spp. accessions.
Ano de publicação: | 2021
Fonte/Imprenta: | Plant Pathology, v. 70, n. 9, p. 2217-2228, Dec. 2021.
ISSN: | 1365-3059
DOI: | https://doi.org/10.1111/ppa.13438
Idioma: | Inglês
Conteúdo: | Recently a Meloidogyne species complex was detected parasitizing and causing dam-age to irrigated rice in southern Brazil, highlighting the need to study the genetic diver-sity of these species and their pathogenicity to Oryza spp. in order to select genotypes of rice with multiple resistance. This study compared the genetic diversity of Brazilian Meloidogyne spp. isolates from irrigated rice and evaluated the reaction of four wild accessions of Oryza species (O. glumaepatula, O. longistaminata, O. grandiglumis, and O. alta) and two cultivated species, O. glaberrima and O. sativa (control) to M. ottersoni, M. oryzae, and two variants of M. graminicola (Est G2 and Est G3). Genetic variability was assessed using RAPD and AFLP markers. M. graminicola and M. ottersoni showed high intraspecific variability: 83.76% and 41.14%, respectively. Cluster analysis showed a clear separation among rice root- knot nematodes (RKNs) into subclades according to their esterase phenotypes with 100% bootstrap. For rice resistance screening, plants were inoculated with 5,000 eggs, and the nematode reproduction factor evaluated 90?120 days postinoculation. O. glumaepatula, an American wild species, was highly resistant or resistant to all rice RKNs tested and is a valuable source of multiple re-sistance. Overall, the other rice species also showed different levels of resistance. Conversely, O. longistaminata exhibited low levels of resistance. M. graminicola Est G3 was the most aggressive isolate. Sources of resistance against RKN in wild Oryzagenotypes, especially in an AA genome like O. glumaepatula, may be of great interest for future breeding programmes in cultivated rice.
Palavras-Chave: | Arroz selvagem; Genetic variability; Oryza glumaepatula; Resistance; Rice root-knot nematodes.
Thesagro: | Arroz; Galha; Genética Vegetal; Nematóide; Recurso Genético; Variação Genética.
Thesaurus Nal: | Wild rice.
Categoria do assunto: | --
Registro original: | Embrapa Clima Temperado (CPACT)

Exemplares:

CENARGEN - (38636-1) - UPC - AP - DD -  -  -  - DIS
CPACT - (22143-1) - UPC - AP - DD -  -  -  - DIS