Authors: Lei Wang Li Dong Yu’e Zhang Yansheng Zhang Weihua Wu Xingwang Deng Yongbiao Xue
Publish Date: 2005/04/07
Volume: 56, Issue: 6, Pages: 929-945
Abstract
The AntirrhinumSlocus Fbox gene AhSLFS2 has been shown to determine the pollen function of SRNasemediated selfincompatibility SI Its initial identification led to the discovery of a large family of plantspecific Fbox proteins named the SLF SLocus Fbox family including members from species with or without SRNase SI system To investigate the evolution and function of its family members in Arabidopsis we first identified 92 Arabidopsis Fbox proteins related to AhSLFS2 referred to as AtSFL Slocus Fboxlike in this report Phylogenetic analyses with family members from several plant species revealed that they could be classified into five subgroups and the SLF genes appeared to have had a monophyletic origin Yeast twohybrid analyses showed that most AtSFL proteins could interact with one or more ASK Arabidopsis Skp1like proteins a component of the SCF Skp1/Cullin or CDC53/Fbox complex suggesting that AtSFLs may function in the process of ubiquitin/26S proteasomemediated proteolysis Transcript analysis found that most of AtSFL genes are expressed ubiquitously and only three of them AtSFL61 79 and 85 displayed a tissuespecific pattern In consistent phenotypic observations for TDNA insertion lines of 37 AtSFL genes revealed that most of them are functionally redundant but inactivation of two AtSFL genes AtSFL61 and 70 appears to have caused developmental defects in embryo or female gametophyte Our results show that a diversified expression and functional pattern are associated with AtSFL genes indicating that they play important roles in various biological processes in Arabidopsis
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