Reference "Quantitative Trait Loci Associated with Seed Dormancy in Rice"

Reference ID

11455

Title

Quantitative Trait Loci Associated with Seed Dormancy in Rice

Source

Crop Science, 2005, vol. 45, pp. 712-716

Authors (4)

Wan-JM	Cao-YJ
Wang-CM	and kehashi-H

Abstract

Seed dormancy is a key agronomic trait related to the quality of seed and rice
production because it imparts resistance to preharvest sprouting. A population
was constructed from a three-way cross, IR50/Tatsumimochi//Miyukimochi, in which
IR50 was an indica donor of strong seed dormancy and Tatsumimochi and
Miyukimochi were nondormant japonica cultivars. Seed dormancy was tested for 166
F1 plants of the three-way cross and their progeny population (F2). A total of
108 simple sequence repeats (SSR) markers were mapped on 12 rice chromosomes,
and quantitative trait locus (QTL) analysis was performed for seed dormancy in
the two segregating generations. Three putative QTLs affecting seed dormancy
were detected on chromosomes 1, 3, and 7 in the F1 generation. Phenotypic
variations explained by each QTL ranged from 4 to 21%, indicating that seed
dormancy is affected by a number of minor genetic effects. The putative QTLs on
chromosomes 1 and 3 were also detected in the F2 generation at the same map
sites. Considering the present and past results there are a number of genetic
factors that affect rice seed dormancy; however, the two SSR markers on
chromosomes 1 and 3 could be used to develop near-isogenic lines (NILs) for map-
based cloning of seed dormancy genes in the regions to thus improve the dormancy
of japonica rice.