干旱生境下红砂种群耐旱机理及遗传多样性研究

红砂是干旱荒漠区常见的超旱生灌木树种，分布于降雨量300mm以下的荒漠地区，是我国新疆、内蒙古、宁夏、甘肃四省区干旱荒漠区的主要树种，具有极高的生态价值，但是由于以往对该树种的认识不足，导致其在生态建设中的作用远未得到发挥,随着国家生态建设步伐的加快，红砂作为优良的抗旱乡土树种，是荒漠区植被恢复和生态重建工作中的首选树种，因此，本研究以我国红砂分布区的28个不同种群3-4年生幼苗为研究对象，通过两点试验，从苗木生理生化以及形态两层面，探讨不同种群红砂对干旱胁迫的响应机理，遗传多样性采用ITS序列为研究对象，构建系统进化树，对个种源进行遗传多样性分析，为红砂的遗传多样性提供分子理论基础，为选育具有高抗旱性的红砂种提供参考。

Reaumuria soongorica is a common drought-tolerant shrub typical species in the arid desert region， distributing in desert areas where the rainfall is less than 300mm, which is the main specie with a high ecological value， distributed in the arid desert region in Xinjiang, Inner Mongolia, Ningxia, and Gansu provinces. However, its function in the ecological construction is far from being played due to lack of knowledge in previous. Reaumuria soongorica is the preferred specie in desert vegetation restoration and ecological reconstruction with the accelerating national ecological pace. 3-4 year seedlings in 28 different populations of Reaumuria soongorica distribution areas will study in two trials site. This study will investigate response mechanism to drought stress in different populations of Reaumuria soongorica from seedling physiology and biochemistry and morphology, and will study genetic diversity of different populations using highly polymorphic, well-repeat and convenient SSR molecular marker technique, in order to provide the theoretical basis and data of Reaumuria Soongorica germplasm for future protection, development and utilization.