Genome-wide Expansion and Expression Divergence of the Basic Leucine Zipper Transcription Factors in Higher Plants with an Emphasis on Sorghum

作     者：Jizhou Wang Junxia Zhou Baolan Zhang Jeevanandam Vanitha Srinivasan Ramachandran Shu-Ye Jiang 

作者机构：Institute of Botany and Temasek Life Sciences Laboratory Joint Research & Development Laboratory Institute of Botany the Chinese Academy of Sciences Beijing 100093 China Temasek Life Sciences Laboratory 1 Research Link the National University of Singapore Singapore 117604 Singapore 

出 版 物：《Journal of Integrative Plant Biology》 (植物学报（英文版）)

年 卷 期：2011年第53卷第3期

页      面：212-231页

核心收录：

学科分类：0710[理学-生物学] 071001[理学-植物学] 07[理学] 071007[理学-遗传学] 0901[农学-作物学] 0703[理学-化学] 0902[农学-园艺学] 

基　　金：supported by Strategic Research Program from Temasek Life Sciences Laboratory in Singapore 

主　　题：LEUCINE zippers TRANSCRIPTION factors SORGHUM GENETICS PLANT genomes PLANT gene expression DIVERGENCE (Biology) CARRIER proteins 

摘      要：Plant bZIP transcription factors play crucial roles in multiple biological processes. However, little is known about the sorghum bZIP gene family although the sorghum genome has been completely sequenced. In this study, we have carried out a genome-wide identification and characterization of this gene family in sorghum. Our data show that the genome encodes at least 92 bZIP transcription factors. These bZIP genes have been expanded mainly by segmental duplication. Such an expansion mechanism has also been observed in rice, arabidopsis and many other plant organisms, suggesting a common expansion mode of this gene family in plants. Further investigation shows that most of the bZIP members have been present in the most recent common ancestor of sorghum and rice and the major expansion would occur before the sorghum-rice split era. Although these bZlP genes have been duplicated with a long history, they exhibited limited functional divergence as shown by nonsynonymous substitutions （Ka）lsynonymous substitutions （Ks） analyses. Their retention was mainly due to the high percentages of expression divergence. Our data also showed that this gene family might play a role in multiple developmental stages and tissues and might be regarded as important regulators of various abiotic stresses and sugar signaling.