Academic Journals Database
Disseminating quality controlled scientific knowledge

Expression of resistance in rice hybrids to Pyricularia grisea

ADD TO MY LIST
 
Author(s): PRABHU ANNE S. | GUIMARÃES ELCIO P. | FILIPPI MARTA C. | ARAUJO LEILA G. | CUTRIM VERIDIANO A.

Journal: Fitopatologia Brasileira
ISSN 0100-4158

Volume: 27;
Issue: 5;
Start page: 454;
Date: 2002;
Original page

Keywords: Magnaporthe grisea | rice blast | hybrid rice | partial resistance | Oryza sativa

ABSTRACT
Thirty-nine rice (Oryza sativa) hybrids and their restorers were assessed for vertical resistance to Pyricularia grisea in the rice blast nursery, and in artificial inoculation tests with two pathotypes, under controlled greenhouse conditions. The hybrids were developed from cytoplasmic genetic male sterile lines 046I and IR 58025A, derived from WA cytoplasm. In the rice blast nursery all hybrids showed susceptible reaction varying from 5 to 9. Compatible and incompatible leaf blast reactions of hybrids to two pathotypes, IC-1 and IB-45, were observed in inoculation tests. A majority of the hybrids were resistant when the restorer was resistant. However, seven of the 25 F1 hybrids exhibited susceptible reactions even when one of the parents was resistant to a pathotype. The partial resistance of 11 hybrids and their parents that showed compatible reactions to two pathotypes was analyzed. Differential interaction between isolates and genotypes was observed for partial resistance in relation to both disease severity and lesion number indicating the specific nature of partial resistance.
Why do you need a reservation system?      Save time & money - Smart Internet Solutions