赤霉素和油菜素内酯是调控水稻茎秆居间生长的重要激素。而细胞壁合成通常处于植物生长的最末端，在植物形态建成中发挥重要作用。因此细胞壁形成受各种植物激素的严格调控，但其信号通路和分子机制并不清楚。本研究围绕水稻茎秆居间生长机制，旨在通过遗传学、生物化学、分子生物学、植物化学等多学科手段，从细胞壁形成调控入手解析赤霉素和油菜素内酯互作调控水稻茎秆居间分生组织分化、生长的分子基础。通过明确水稻茎秆居间生长中细胞壁合成规律、关键基因的表达特征、以及揭示赤霉素和油菜素内酯调控纤维素合酶等细胞壁关键基因表达的信号通路、关键分支点，从多方面阐明赤霉素和油菜素内酯在茎秆发育中的作用机制，为水稻茎秆相关性状的遗传改良提供新依据。

Gibberellin (GA) and brassinosteriod (BR) are important phytohormones for the internode intermediate growth. Cell wall formation responsible for plant morphogenesis often locates at the last steps of many developmental events. Cell wall formation proceeds under the control of many phytohormones. However, the underlying mechanisms of these controls are still unknown. In this study, we focus on the intermediate growth of rice internodes and aim to: 1. characterize cell wall features and gene expression patterns during the intermediate growth; 2. establish the molecular link or signal transduction pathways between the GA and BR actions and cell wall formation; 3. Identify the center modules that integrate GA and BR signals to control cell wall formation during the intermediate growth of rice internodes. Finally, reveal the mechanism of GA and BR roles on the control of intermediate meristem differentiation and internode development, which will be useful for the improvement of agronomic traits related to crop internodes, aiming to increase crop yield.