Han Long-zhi

Identification of quantitative trait loci for alkali digestion value in japonica rice.

Using an F2 population including 200 individuals derived from a cross combination between two japonica rice DL115 with large grain and XL005 with small grain,which were significantly different on alkali digestion value (ADV),the quantitative trait loci for ADV were identified by composite interval mapping with SSR markers.The results showed that ADV exhibited a normal continuous distribution in F2 population,indicating that ADV is a quantitative trait controlled by multiple genes.A total of three QTLs conferring ADV were detected in intervals of RM14870-RM1284,RM3838-RM3351,and RM1812-RM332 on chromosomes 3,5,and 11,and explained 6.5%,10.3% and 8.1% of the observed phenotypic variance,respectively.The allele of qADV5 was derived from XL005 with less ADV,and the alleles of qADV3 and qADV11 were derived from DL115 with bigger ADV.The gene action was controlled by dominance and over-dominance.