Characterization of subunits encoded by SnRK1 and dissection of combinations among these subunits in sorghum (Sorghum bicolor L.) oleh Qian-lin XIAO, Tian-hui HUANG, Chang ZHOU, Wei-xi CHEN, Jian-kui CHA, Xi-mei WEI, Fang-yu XING, Meng-ya QIAN, Qian-nan MA, Hong DUAN, Zhi-zhai LIU