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PHENOTYPING AND MOLECULAR VALIDATION OF RICE GENOTYPE FOR BLAST AND SHEATH BLIGHT RESISTANCE

KrishiKosh

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Title PHENOTYPING AND MOLECULAR VALIDATION OF RICE GENOTYPE FOR BLAST AND SHEATH BLIGHT RESISTANCE
M.Sc.
 
Creator DUBEY, ABHISHEK KUMAR
 
Contributor Uday Dhari Singh
 
Subject weeds, control methods, herbicides, sowing, crops, yields, harvesting, spices, drying, planting
 
Description T-8837
Globally, two major fungal diseases of rice, viz. blast caused by Magnaporthe
oryzae and Sheath blight incited by Rhizoctonia solani Kuhn. occur in all agroecosystem
resulting in significant yield losses. Host plant resistance is the most
accepted management option for reducing crop loss due to biotic stresses. In the
present study, a set of 102 rice lines were evaluated for blast as well as sheath
blight resistance. None of the rice genotypes was resistant to sheath blight.
However, four entries were observed to possess high degree of tolerance to sheath
blight and were validated for major sheath blight QTL (qSBR11-1). When the
same set of 102 rice genotypes were screened for blast resistance with M. oryzae
isolate (Mo-ni-0066) from Meerut, 32 entries were identified phenotypically
resistant. These entries were subjected to molecular validation for the presence of
five major R-genes, viz., Piz5/ Pi9, Pita, Pi54, Pi1, and Pib. Individually none of
the entries could be observed to possess all these major R-genes .However some
of the resistant genotypes were validated for one or more R-genes. Further,
evaluation of these genotypes with highly virulent M. oryzae isolate (Mo-simandya-
hr-12) from Karnataka revealed that Bhusan San and P 1490-03 were
resistant to blast. Interestingly, molecular validation of these two genotypes did
not show any of the above R-genes, indicating the possible role of some other Rgene/
s.
 
Date 2016-06-22T12:15:52Z
2016-06-22T12:15:52Z
2013
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/67706
 
Format application/pdf
 
Publisher IARI,Division of Plant Pathology