QTL analysis of drought tolerance traits in rice during the vegetative growth period

Drought affects the growth and development of rice from direct seeding or transplanting to maturity in northern China. It is important carry out QTL mapping for drought tolerance improve breeding. In this study, a RIL population consisting 253 families was constructed by crossing Miyang 23 with Jileng 1. The leaf rolling index (LRI), withering degree (LWD) chlorophyll content (LCC) were measured over three years, QTLs these traits mapped. results showed that LRI, LWD LCC all quantitative controlled multiple genes. A total 28 related drought-resistant indices detected; four controlling LRI detected on Chromosome qLRI1-1 qLWD1-4 located interval AH01001843-RM302, explaining 10.30% 4.90% phenotypic variation, respectively; qLWD1-2B qLRI-1JC both RM315-S01167A, explained 11.15% while 7.96% variation. two 5, qLWD5-1B qLRI5, CMB0526.3486-RM87. 6.93% qLRI5 8.79%-9.13% 12, qLWD12 qLRI12, S12099-CMB1226.0 4.59%-7.25% above QTLs, including qLWD1-2B, qLRI1-1JC, have been many times. Future work should involve implementing in-depth fine using identified markers resistance molecular marker selection breeding rice.