Sheath blight, caused by the pathogen Rhizoctonia solani
Kühn, is one of the most serious diseases of rice and leads
to severe yield losses worldwide. A recombinant inbred
line (RIL) population consisting of 122 lines was constructed
from a cross between Danteshwari a high yielding popular
rice cultivar but moderately susceptible to water stress,
susceptible to sheath blight and Dagad Deshi a tall deep
rooted poor yielder and tolerant to water stress and sheath
blight. Five traits, namely infected tillers per hill, lesion size
(total coalescing lesions) and individual lesion (one spot)
and lesion’s length and width) were used to evaluate sheath
blight resistance. Using the RIL population and 162
molecular markers, 11 quantitative trait loci (QTLs) were
identified for the five traits. Identification of map position
was accomplished by identifying BAC or PAC clones that
simultaneously contained a hit from the microsatellite /
HvSSR marker further helped us to generate a high
resolution molecular marker map of the identified QTL
region. Identified QTLs were located on seven
chromosomes. A major QTL for infected tillers per hill on
chromosome 1 was identified with phenotypic variance of
18.02%. Six QTL’s with positive additive effect and one
with negative additive effects was identified indicating
alleles at these loci are being contributed by either of the
parents respectively.
Keywords: QTL, rice, sheath blight, markers
Year: 2018
Volume: 78
Issue: 2
Article DOI: 10.5958/0975-6906.2018.00025.1
Print ISSN: 0019-5200
Online ISSN: 0975-6906
Ashok Koshariya info_circle
Indra Kumar info_circle
Ashish Pradhan info_circle
Umesh Shinde info_circle
S. B. Verulkar info_circle
Toshy Agrawal info_circle
Anil Kotasthane info_circle