Reference "Mapping of quantitative trait loci conferring blast field resistance in the Japanese upland rice variety Kahei"

Reference ID

7824

Title

Mapping of quantitative trait loci conferring blast field resistance in the Japanese upland rice variety Kahei

Source

Breeding Science, 2001, vol. 51(4), pp. 257-261

Authors (3)

Miyamoto-M	Yano-M
Hirasawa-H

Abstract

Many upland rice cultivars show higher levels of blast field resistance than do
lowland cultivars. In this study, we performed a linkage mapping of quantitative
trait loci (QTLs) for blast field resistance using F2 plants/F3 progenies
derived from a cross between the upland variety Kahei (high level of resistance)
and the lowland variety Koshihikari (susceptible). We mapped two putative QTLs
on chromosome 4. qBFR4-1 was mapped in the vicinity of restriction fragment
length polymorphism (RFLP) marker G264 on chromosome 4. This QTL explained about
62% of the total phenotypic variation in F3 lines. Another QTL, qBFR4-2, was
also found near the RFLP marker G271 on chromosome 4. These two QTLs on
chromosome 4 explained about 71% of total phenotypic variation based on the
analysis of a multiple-QTL model. Alleles of Kahei increased the level of
resistance in these two QTLs. The high level of resistance to blast in Kahei is
mainly explained by these two QTLs. Applications of newly found QTL for breeding
rice with blast field resistance is discussed.