拟南芥ABI5亚家族有九个成员，属于碱性亮氨酸拉链类转录因子。该亚家族九个成员高度同源，它们在植物生长发育的种子成熟、休眠、开花阶段以及ABA等激素和干旱/高盐/高渗等逆境响应中发挥作用。由于这些转录因子中存在着转录活性调控区域，超表达单个完整的转录因子通常看不到明显的遗传表型变化。再由于该家族九个成员间的基因冗余，单个成员的突变体植株的遗传表型变化也不明显。对此，申请者拟通过分析ABI5亚家族九个成员的时空表达特性，各成员转录激活活性模式超表达时引发的下游基因的表达类型以及转录激活活性模式超表达时转基因植株的遗传表型变化，亚家族九个成员间可形成同/异二聚体的模式等研究工作阐明拟南芥ABI5亚家族九个成员在拟南芥生长发育期间以及环境逆境响应过程中各自的精细生物学作用。

There are nine members of the Arabidopsis ABI5 subfamily, which belong to the basic-leucine-zipper transcription factors. The nine members of the subfamily are highly homologous and play roles in seed maturation, dormancy, flowering, ABA and stress responses during plant growth and development. Because of the presence of transactivity-controlling regions in these transcription factors, plants of overexpressing a single complete transcription factor of the subfamily usually fail to show a distinct phenotypic variation. Because of the gene redundancy among the nine members of the subfamily, there were no significant changes in the genetic phenotype of the single member mutant plants. In this regard, the applicants intend to characterize the spatial and temporary expressions of the nine members of the subfamily, transcriptomic changes and phenotypic changes of the transgenic Arabidopsis plants with overexpressing the transcriptional activation patterns of the nine members, and the heterodimers formed among the nine members, and to elucidate the accurate roles of the nine members of the ABI5 subfamily in Arabidopsis during growth and development and environmental stress responses.