Research Paper : Screening and identification of new sources of resistance to sheath blight in wild rice accessions
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Authors
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B. M. Bashyal
Division of Plant Pathology, ICAR-Indian Agricultural Research Institute, Pusa Campus, New Delhi 110 012
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Kirti Rawat
Division of Plant Pathology, ICAR-Indian Agricultural Research Institute, Pusa Campus, New Delhi 110 012
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Dhiraj Singh
Division of Plant Pathology, ICAR-Indian Agricultural Research Institute, Pusa Campus, New Delhi 110 012
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S. Gopala Krishnan
Division of Genetics, ICAR-Indian Agricultural Research Institute, Pusa Campus, New Delhi 110 012
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A. K. Singh
Division of Genetics, ICAR-Indian Agricultural Research Institute, Pusa Campus, New Delhi 110 012
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N. K. Singh
National Research Centre on Plant Biotechnology, Pusa Campus, New Delhi 110 012
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Rashmi Aggarwal
Division of Plant Pathology, ICAR-Indian Agricultural Research Institute, Pusa Campus, New Delhi 110 012
Abstract
A total of 218 wild rice accessions including O. rufipogon
and O. nivara were evaluated under artificial inoculation for
resistance to sheath blight disease for two years under
field conditions. The germplasm identified as resistant to
sheath blight were further evaluated through artificial
inoculation for an additional year under glass house
conditions. Based on three years of testing, two Oryza
rufipogon accessions, namely, IC336719 and IC336721 were
identified as resistant to sheath blight disease. In vitro
characterization of resistant genotypes revealed that the
size of sheath blight lesion formation was small along with
comparatively lesser number of infection cushions and
penetration pegs as compared to the susceptible checks.
The O. rufipogon accessions identified in the present study
are very valuable genetic resource, which can be utilized in
the development of introgression lines and mapping QTL(s)
governing resistance to sheath blight of rice.