不同败蔸抗性苎麻地上部与地下部物质代谢的差异及模拟仿真试验研究

苎麻及其制品是我国的特产和重要的出口创汇产品。苎麻败蔸现象是苎麻老化或对逆境环境不适应而产生的一种衰老反应，严重影响苎麻的纤维产量与品质。苎麻除受外界环境因素的影响引起败蔸外，其体内养分运输和物质代谢特点也影响着麻蔸的生长发育。前期研究发现不同苎麻品种的败蔸抗性差别很大，因此研究不同败蔸抗性苎麻品种地上部与地下部养分运输及物质代谢的差异具有十分重要的理论与实践意义。本项目以不同败蔸抗性的基因型苎麻为材料（包括败蔸抗性强的苎麻新品系湘苎7号），采用盆栽试验、大田小区试验与室内分析检测相结合的方法，研究不同基因型苎麻在干旱、淹水、除草剂和病虫害胁迫下败蔸的差异，对苎麻大面积应用品种进行败蔸抗性筛选，并研究不同败蔸抗性苎麻地上部与地下部物质代谢及调控的差异，以初步揭示苎麻不同基因型败蔸抗性差异的生理生化机制，为减缓苎麻败蔸、提高苎麻纤维产量品质和培育优质高产苎麻新品种（品系）提供理论依据。

Ramie and its products are specialty and important export product of China. The root-rotten of ramie which seriously affects fiber yield and quality is aging reaction or tolerance of environmental stress. With the exception of the external environment factors, the characteristics of nutrient transport and metabolism in the ramie also affects the growth and development of root. There are significant differences among varieties of ramie. There are theoretical and practical significances to study the differences of nutrient transport and substance metabolism in the aboveground and underground part in different root-rotten resistant of ramie. In this study, the root-rotten difference under stresses of drought, flooding, herbicide and diseases and pests and the differences of substance metabolism and chemical regulation in the aboveground and underground part in different root-rotten resistant of ramie will be studied by experiments with the combination of pot experiments, field plot experiments and laboratory analysis, the good varieties of ramie with root-rotten resistance will be screened and the physiological and biochemical characters of root-rotten resistance of ramie will be revealed. The theoretical basis for releasing root-rotten and ramie variety breed with good quality and high yield will be provided.