Please use this identifier to cite or link to this item: http://www.alice.cnptia.embrapa.br/alice/handle/doc/104099
Research center of Embrapa/Collection: Área de Informação da Sede - Artigo em periódico indexado (ALICE)
Date Issued: 1996
Type of Material: Artigo em periódico indexado (ALICE)
Authors: PRABHU, A. S.
SOAVE, J.
ZIMMERMANN, F. J. P.
FILIPPI, M. C.
SOUZA, N. R. G.
CURVO, R. C. V.
LOPES, A. M.
SOBRAL, C. A. M.
FERREIRA, R. P.
KOBAYASHI, T.
GALVAO, E. U. P.
Title: Genetic variability for disease resistance in Brazilian upland rice native germplasm.
Publisher: Pesquisa Agropecuaria Brasileira, Brasilia, v.31, n.6, p.413-424, jun. 1996.
Language: en
Keywords: Drechslera oryzae
Gerlachia oryzae
Genétic diversity
Partial resistance
Diversidade genetica
Resistencia parcial.
Description: Thirty nine rice genotypes were evaluated under dryland field conditions for resistance to leaf and neck blast, brown spot, leaf scald, narrow brown leaf spot and grain discolaration in 13 test sites during a three-year period. these include 17 land races, six traditional cultivars, 11 improved breeding lines and three exotic cultivars. There was a great diversity in the native germplasm in relation to resistance to different patogens. The land races Iguape Redondo, Arroz de Guerra, Cateto and Chatao exhibited partial resistance to leaf blast comparable to IRAT 13 and IRAT 104 and superior to the traditional cultivar IAC 47. The leaf blast se verities and neck blast incidences of medium maturing genotypes were positively correlated (r=0.86,P<0.01). A number of gentoypes exhibited a high degree of resistance to grain discolaration relative to the susceptible controls, Vermelho miudo, Mimoso and Cajueiro Liso. The correlation between mean brown leaf spot and mean grain discolaration severities of different trials was positive both for early maturing (r=0.93, P<0.01) and medium maturing (r=0.77, P<0.01) genotypes. The early maturing improved line M 39 had shown a high level of multiple disease resistance. The localities Goiania (GO) and Jaciara (MT) were identified as hot spot screening sites for rice blast and grain discolaration, respectively.
Thesagro: Cercospora Oryzae
Pyricularia Grisea
Pyricularia Oryzae.
Data Created: 1997-01-09
Appears in Collections:Artigo em periódico indexado (AI-SEDE) / Embrapa Informação Tecnológica (SCT)

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