树木分枝角度是涉及树木空间结构形成、光合效率、材性发育等多方面的一个重要树木育种性状，但目前对于树木分枝角度分子调控机制及其与材性发育之间的影响机制尚不明确。本研究拟利用国家沙柳（Salix psammophila Wang et Yang）无性系种质资源保存库的无性系聚群为研究资源，利用其多样化的分枝角度为研究特征，分析IGT基因家族对树木分枝角度调控及材性发育的影响，利用转基因和RNAseq技术进行候选基因功能鉴定，分析转基因植株中候选基因与材性发育中关键基因的相关性。本研究拟初步揭示树木分枝角度的可能分子调控机制及其对材性发育的影响，对于树木重要性状的形成研究具有重要意义，对于未来树木分子育种具有重要应用价值。

Tree’s branch angle plays the critical roles in the tree architecture, photosynthetic efficiency and formation and so on. But the branch angle’s molecular regulation mechanism and influences on wood formation are not clear. This project will take clonal collection in National Germplasm Genebank of Salix psammophila as research resources, focus on their diversified branch angle and analyze IGT gene family’s function on branch angle and wood formation. The technologies of transferring gene and RNAseq will be applying in IGT gene function’s identification. The correlation between IGT gene family and wood formation will be studied. This project will reveal the branch angle’s molecular regulation mechanism and its influences on wood formation. It has important significance for understanding the tree’s important characters development and great value for tree’s molecular breeding in future.