Abstract:

【Objective】 The additive and epistatic and their GE effects on PGWC were analyzed in rice, genetic characters of PGWC in rice and characters of QTL detected in different populations were discussed. 【Method】 A BIL population and a CSSL population derived from the cross of Koshihikari (japonica) and Kasalath (indica) were used to detect QTL and epistatic QTL and GE effects on PGWC in Nanjing in 2005 and 2006. CSSL carried overlapping chromosome segments of Kasalath in a genetic background of Koshihikari. 【Result】 Five QTL and two pairs of epistatic QTL were detected in CSSL population and three QTL and four pairs of epistatic QTL were detected in BIL population. Of them, qPGWC-6a was detected in the two populations. Only one pair of epistatic QTL was detected in two years and in CSSL population. All of QTL had a significant GE effects (P＜0.01) in BIL population. A total of two new QTL for PGWC were found on chromosome 3 and 4 in this experiment. 【Conclusion】 Epistatic effects is important for the heredity of PGWC as well as additive effects, there is ubiquitous for GE effects on PGWC, but which is inferior to the corresponding additive effects and epistatic effects. QTL detected in different populations contributed to completely reveal the genetic network for PGWC in rice.

Key words: rice, percentage of grains with chalkiness (PGWC), QTL, epistasis, genotype × environment (GE)