Resistance spectra of six elite breeding lines of upland rice to Pyricularia grisea

Pesquisa Agropecuária Brasileira

Anne Sitarama Prabhu²  Emílio Da Maia De Castro²  Leila Garcês De Araújo²  Rodrigo Fascin Berni¹ 

[1] ,Embrapa Centro Nacional de Pesquisa de Arroz e Feijão Santo Antônio de Goiás GO ,Brazil

关键词: Oryza sativa;    pathotypes;    physiologic races;    rice blast;    inoculation methods;    Oryza sativa;    patótipos;    raças fisiológicas;    brusone;    métodos de inoculação;   

DOI  :  10.1590/S0100-204X2003000200006

来源: SciELO

【 摘 要 】

The objective of this work was to evaluate the resistance spectra of six elite breeding lines of rice, developed for improved yield and grain quality, in inoculation tests in the greenhouse and in the field. Forty-six isolates of Pyricularia grisea collected from the cultivar Primavera, 31 from the cultivar Maravilha and 19 from six elite breeding lines, totaling 96 were utilized for inoculations. Out of 11 international and 15 Brazilian pathotypes, IC-1, IB-9, and BD-16, respectively, were identified as most frequent isolates collected from the cultivar Primavera. The isolates retrieved from Maravilha belong to four international and 11 Brazilian pathotypes, the predominant ones being IB-9 and IB-49 and BB-1 and BB-21, respectively. Lines CNAs 8711 and CNAs 8983 showed resistant reaction to all test isolates from Maravilha, while CNAs 8983 was susceptible to three isolates of Primavera pertaining to the pathotype IC-1. A majority of isolates exhibiting compatible reaction to Primavera were incompatible to Maravilha and vice-versa.Field assessment of rice blast utilizing the area under disease progress curve as a criterion for measuring disease severity showed significant differences among the six breeding lines. The isolates of P. grisea exhibiting differential reaction on breeding lines can be utilized in pyramiding resistance genes in new upland rice cultivars.

【 授权许可】

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