油菜素甾醇（BR）调控植物生长发育的许多方面，其路径是分子育种的主要目标路径之一。MYB是植物中数量最多、功能最为多样化的转录因子家族之一。然而BR信号与MYB转录因子的互作研究目前尚处于空白。本研究组在筛选番茄BR信号路径关键组分SlBIN2的互作蛋白时，发现了与SlBIN2互作的一个MYB类转录因子SlBIMLP。预试验确认了这一互作，并初步表明SlBIMLP在BR路径发挥作用，影响株高、花期和果实发育等性状。本研究拟使用遗传转化、基因编辑、激酶分析、免疫沉淀等多学科的方法研究BR通过SlBIN2对SlBIMLP的细胞定位、磷酸化、降解和转录活性的影响，研究SlBIMLP介导BR信号调控基因转录，进而影响花期和果实发育等性状，从而揭示SlMYB介导BR信号调控番茄生长发育的分子机理。该研究将为BR信号转导增加一个下游新分枝的知识，并对番茄等果菜类生产实际具有十分重要的意义。

Brassinosterods regulate many aspects of plant growth and development, and BR signal pathway is one of the major targets of molecular breeding. MYB is one of the largest and diverse transcription factor families in plants. However, the investigations on the interaction between BR signal and MYB transcription factor have not been reported yet. In this study, we have detected a MYB transcription factor SlBIMLP interacting with SlBIN2 in screening the interaction proteins of SlBIN2, a key component of BR signal pathway in tomato. The pre-experiments confirmed this interaction and initially indicated that SlBIMLP played a role in BR pathway, affecting plant height, timing of flowering and fruit development. In this study, a series of methods in multiple disciplines, such as genetic transformation, genome editing, kinase assay, and immunoprecipitation, will be used to study the function of BR signaling via SlBIN2 on localization， phosphorylation, degradation, and transcription of SlBIMLP, and the SlBIMLP regulating gene transcription to impact flower timing and fruit development, so as to reveal the molecular mechanism of SlMYB-mediated BR signal in regulating tomato growth and development. This study will produce the knowledge about a downstream branch of BR signal transduction and will be valuable reference for production of tomato , as well as other fruit vegetables.