Genetic variation of yellow pigment and its components in foxtail millet (Setaria italica (L.) P. Beauv.) from different eco-regions in China oleh Yan-bing YANG, Guan-qing JIA, Li-gang DENG, Ling QIN, Er-ying CHEN, Xin-jun CONG, Ren-feng ZOU, Hai-lian WANG, Hua-wen ZHANG, Bin LIU, Yan-an GUAN, Xian-min DIAO, Yan-ping YIN