中文摘要：

根系是作物感受土壤水分信号最直接的器官.本试验以野生大豆、选育品种和地方品种40份种质资源为研究材料,采用温室砂培法,探讨干旱胁迫对根系特征的影响.结果表明：发达的根系是野生大豆高耐旱性的主要特征.大多野生大豆耐旱性较高,其次为地方品种,大多育成品种耐旱性较差.在水、旱两种条件下,三类大豆种质根系性状表型均有差异.干旱胁迫条件下,育成品种与野生大豆及地方品种根系性状差异分别达极显著和显著水平.大多数根系性状与耐旱隶属函数相关性显著,这些根系性状可作为鉴定大豆耐旱性的间接指标.

英文摘要：

Root is the most direct sensory organ used for sensing soil water signal. 40 accessions of soybean including bred varieties, landrace and wild soybean under the controlled environments using sand culture method were tested for their drought tolerance. The results show that the drought tolerance of most of wild soybeans is stronger than landrace, and the drought tolerance of most of varieties is lower. The main characteristic of wild soybean with strong tolerance is that it has a well-developed root system. There are different root characters among three types of soybean under the condition of being well watered and drought stress. Most of root traits in variety and wild soybeans（or landrace） are（extremely） significant difference between water stress and control. Most of root traits are significantly correlated with the drought tolerant membership functions, which are chosen as indirect evaluation indices for soybean drought tolerance.