Partial resistance to blast disease in some rice varieties
1989
Kamel, S.M. | Balal, M.S. | El-Bigawi, T.A. | Osman, Z.H. (Plant Pathology Research Inst., Giza (Egypt). Agricultural Research Center)
Partial resistance to rice blast was investigated in a set of rice varieties, using the conventional parameters diseased leaf area, number of lesions, relative infection efficiency, and sporulation capacity. The highest number of lesions occurred on Reiho and Giza 159. Very low numbers were recorded on Reiho and Giza 1394-10-1. Number of lesions increased with decreasing leaf age. Relative infection efficiency (RIE) as measured by number of lesions per unit leaf area gave more reliable information than the number of lesions per leaf. RIE was higher on younger leaves, and varied with variety. Sporulation capacity differed among entries. Giza 159 and Reiho showed the highest sporulation capacity, closely followed by Giza 171 and Giza 172; GZ1394-10-1-1 showed the lowest, followed by GZ175-5-6 and GZ2175-5-4. Size of lesions of leaves did not differ significantly among varieties, but those of line GZ1394-10-1-1 were the smallest. Disease progress varied considerably: IR28, IR1626-203, and GZ1368-5-4 did not show any disease symptoms, indicating the absence of compatible races. Giza 171, Giza 172, and Reiho showed severe disease symptoms and blast developed very fast. GZ1394-10-1-1 showed symptoms of slow spread of the pathogen inside the host cells, resulting in a very small diseased leaf area.
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