Abstract:
One of the two major rice diseases is sheath blight, which is
caused by the fungus Rhizoctonia solani. To date, only partial
resistance to rice sheath blight has been identified. In this
experiment, 58 Recombinant Inbred Lines from the BC2F6
progenies of 'IR64' x 'Binam' were studied for polymorphism
using 176 Simple Sequence Repeats (SSR) Markers. Five
Quantitative Trait Loci (QTLs) for sheath blight were identified,
three of which are located on chromosome 2; these are QTL1
which was linked to RM324, QTL2 and QTL3 which were both
linked to RM262. The two other QTLs, which are QTL4 and
QTL5, were located on chromosomes 9 and 11, respectively. The
QTL4 was linked to RM242 while QTL5 was linked to RM209.
Identification of Quantitative Trait Loci (QTL) for sheath blight
resistance can be used to identify major genes conferring to sheath
blight resistance fbr production of rice varieties with nearly
complete or complete resistance.
