QTL mapping of grain appearance quality traits and grain weight using a recombinant inbred population in rice (Oryza sativa L.) oleh Fang-yuan GAO, Li-hua ZENG, Ling QIU, Xian-jun LU, Juan-sheng REN, Xian-ting WU, Xiang-wen SU, Yong-ming GAO, Guang-jun REN