Phenotyping of improved rice lines and landraces for blast and sheath blight resistance
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Authors
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A.K. Dubey
Division of Plant Pathology; , Indian Agricultural Research Institute, New Delhi 110 012
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R. T. P. Pandian
Division of Plant Pathology; , Indian Agricultural Research Institute, New Delhi 110 012
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H. Rajashekara
Division of Plant Pathology; , Indian Agricultural Research Institute, New Delhi 110 012
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V.K. Singh
Division of Plant Pathology; , Indian Agricultural Research Institute, New Delhi 110 012
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G. Kumar
Division of Plant Pathology; , Indian Agricultural Research Institute, New Delhi 110 012
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P. Sharma
Division of Plant Pathology; , Indian Agricultural Research Institute, New Delhi 110 012
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A. Kumar
Division of Plant Pathology; , Indian Agricultural Research Institute, New Delhi 110 012
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S. Gopala Krishnan
Division of Genetics, Indian Agricultural Research Institute, New Delhi 110 012
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A.K. Singh
Division of Genetics, Indian Agricultural Research Institute, New Delhi 110 012
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R. Rathour
Department of Biotechnology, CSKHPKV, Palampur, H.P
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U.D. Singh
Division of Plant Pathology; , Indian Agricultural Research Institute, New Delhi 110 012
Abstract
Globally,two major fungal diseases of rice,viz., blast caused by Magnaporthe oryzae and sheath blight incited by Rhizoctonia solani Kuhn. occur in all agro-ecosystems resulting in significant yield losses. In the present study, a
set of 100 rice lines were evaluated for blast and sheath blight resistance. Twenty seven genotypes were identified to be resistant against M. oryzae isolate (Mo-ni-0066). However, evaluation of these genotypes with highly virulent M. oryzae Karnataka isolate (Mo-si-mnd) revealed that only two genotypes viz., Bhusan San and P1490-03 were resistant. Same set of genotypes were screened for sheath
blight resistance. Four entries, viz., BPL7-12, BML27-1, BML 21-1 and Kajarahwa possess high degree of tolerance to sheath blight but none of the rice entries was completely resistant.