벼멸구 저항성 여교잡 집단의 등숙특성 QTL 분석

QTL Analysis for Ripening Traits of BHP Resistant Backcross Inbred Lines in Rice

In order to identify the relationship between a brown planthopper (Nilaparvata lugens Stal) resistance gene Bph1 and ripening traits, we conducted the QTL analysis using 130 backcross inbred lines (BC5F5BIL) derived from a cross of the BPH susceptible Japonica cultivar, ‘Nagdongbyeo’ as the recurrent parent and Tongil-type resistant cultivar ‘Samgangbyeo’ as a donor parent. Although this population was obtained from 5 time of backcross, BPH resistant and susceptible lines differed significantly in grain filling ratio, head rice ratio of brown rice and number of spikelets per panicle. Five SSR markers on chromosome 12 detected in the introgressed chromosome segment of resistant donor, and two QTLs related with grain filling ratio (gfr12) and brown head rice ratio (bhr12) were detected in the marker between RM3813 and RM5609 explaining 23% and 21% of the total variance, respectively. Grain filling ratio and head rice ratio of brown rice were increased by ‘Samgangbyeo’ allele. This result suggests that high quality variety carrying the BPH resistance gene could be developed by combination of MAS and backcross in rice breeding.