Use of local rice cultivars as additional differentials to identify pathotypes of Pyricularia oryzae

Bragantia

Gisele Barata Da Silva²  Leila Garcês De Araújo¹  Valácia Lemes Da Silva Lobo¹  Anne Sitarama Prabhu¹  Marcela Cristiane Ferreira Rêgo²  Eduardo Tavares Paes¹  Marta Cristina Corsi De Filippi¹ 

[1] ,Universidade Federal Rural da Amazônia Laboratório de Proteção de Plantas Belém PA ,Brasil

关键词: Pyricularia grisea;    rice leaf blast;    physiologic races;    Oryza sativa;    virulence;    resistance;    differential varieties;    Pyricularia grisea;    brusone;    raça fisiológica;    Oryza sativa;    virulência;    resistência;    cultivares diferenciadoras;   

DOI  :  10.1590/S0006-87052011000400019

来源: SciELO

【 摘 要 】

Eight additional rice cultivars as differentials were selected to identify pathotypes occurring in the Tocantins State. They were BRS Jaburu, BRS Taim, BRS Biguá, BR IRGA-417, Epagri 109, Javaé, Metica-1 and Supremo. These differentials were used in addition to the international set to determine the pathogenic diversity of 193 Pyricularia oryzae isolates collected during 1994-2002 from irrigated rice cultivars. They were conserved in Pyricularia culture collection of Embrapa Rice and Bean Research center. From 193 P. oryzae isolates 38 pathotypes were identified based on leaf blast reactions of international set and 29 pathotypes based on these additional differentials. The predominant pathotypes (TI-1, TG-2, TD-15 and TF-2) were represented by 53% of the tested isolates. The major international pathotypes (IB-45, IB-41, II-1 and ID-13) were represented by 43% of the isolates tested. The virulence pattern of 28 isolates belonging to the pathotype IB-45 was further differentiated into nine local pathotypes using additional set of differentials. The irrigated rice cultivars used as additional differentials serve as complementary set to identify pathotypes of interest for breeding blast resistant cultivars for Tocantins State.

【 授权许可】

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