本课题组在陆地棉C119-2分离群体中发现一种新的对赤霉素敏感的矮杆突变体材料。该突变体的子叶与真叶卷缩并极度矮化。若不进行人工喷施外源赤霉素，该突变体不能启动开花、结铃等发育过程；但通过外源赤霉素的施加，可以正常开花结铃。通过SSR分子标记，将控制该突变体的基因du初步定位在棉花第6染色体上。本研究在前期研究的基础上，利用“海7124”与“超矮101”杂交产生的F2作图群体，对该突变基因进行精细定位。同时结合超矮突变体 “超矮101”和野生型材料经赤霉素处理前后的表达谱测序分析来筛选控制该性状的候选基因。将得到的候选基因利用病毒诱导的基因沉默技术和拟南芥突变体植株的功能互补实验来对候选基因进行功能验证，以期获得控制该突变性状的基因。

A special dwarf mutant cultivar of GA-sensitivity was found in isolated population of upland cotton C119-2. Cotyledon and leaf of the mutant was curly and the height was extremely dwarf. Without manual spraying exogenous gibberellin, the mutant’s development process of flowering, boll, etc. can not be started. Conversely, exogenous gibberellin can make it finish the normal flowering and bolling. The mutant gene – du was primary mapped on Chr.06 of the cotton used SSR markers. Based on the basis of preliminary studies, the fine mapping of mutant gene – du will be launched on the use of "Hai7124" and "ultra-dwarf 101" hybrid produced F2 population. Combined with the results of GA treatment between ultra-dwarf mutant "ultra-dwarf 101" and the wild-type material by the expression profiling of sequencing, the candidate genes controlling the trait will be screened. We hope to get the muntant gene contronling the ultra-dwarf mutant followed by virus induced gene silencing(VIGS) and functional complementation experiment in Arabidopsis.