Basic-helix-loop-helix（bHLH）蛋白是植物体内非常重要的转录因子家族，它们参与多种植物生长发育过程。此前人们发现拟南芥体内的三个bHLH基因BR-ENHANCED EXPRESSION 1（BEE1）、BEE2和BEE3的表达量可以被激素brassinosteroid（BR）诱导而增加。我们在前期的工作中发现BEE1具有促进光周期诱导开花启始的功能，而开花是植物繁殖以及植物生命周期的重要过程。此外，我们还发现BEE1蛋白在蓝光缺失的条件下迅速降解，这为BEE蛋白参与光信号转导提供了进一步的证据。目前国际上对有关bHLH蛋白调控植物开花时间的研究还很少，本项目将进一步研究BEE1调控开花的机制，以及BR在开花调控过程中的功能，以期揭示光信号与激素信号之间的交叉。对本项目的研究将使我们率先从新的角度更加清晰地了解植物开花的机制，并利用bHLH蛋白更好地为农业生产服务。

Basic-helix-loop-helix (bHLH) protein family is a very important group of transcription factors in plants. They take part in many processes of the growth of plant. It has been shown that, in Arabidopsis thaliana, the expression level of three bHLH genes can be up-regulated by the treatment of hormone brassinosteroid (BR), they are named BR-ENHANCED EXPRESSION1 (BEE1), BEE2 and BEE3. Our previous results showed that overexpress of BEE1 leaded to the early flowering phenotype, so BEE1 may have the function of promoting flowering initiation. Flowering is a significant process during propagation and the life cycle of plant, however, the research about bHLH prote in promoting flowering is limited at present. In addition, we also noticed that BEE1 protein is degraded without blue light, which further prove that BEE1 may be invovled in light signal transduction, in the same time, this project will explain the crosstalk between light and hormone signal for the first time . This program of research will help us to understand the mechanism of flowering initiation more clearly from a new point of view, and finally to use bHLH protein better serve the agricultural industry.