Bibliographical noteFunding Information:
This work was supported by the National Natural Science Foundation of China (201263, 383601 and 31200273), the Ministry of Agriculture of China (2011ZX08002-004 and 2013ZX08010-002) and Chinese Academy of Sciences (KSCX2-EW-N-06, KSCX2-EW-J-6). We thank X. Wang for bioinformatics analysis.
This study was supported by grants from the National Basic Research Program of China 2012CBA01300, “Strategic Priority Research Program” of the Chinese Academy of Sciences XDA01020101, the National Science Foundation of China 90919060 and the Ministry of Science and Technology of China 2011CBA01101 (all to Q.Z.).