用PEG-6000(-0.50 MPa)分别处理6个抗旱小麦品种2叶1心的幼苗，模拟干旱胁迫环境，分别在干旱胁迫处理后第3 天、第9 天测定小麦幼苗的株高、相对含水量、叶绿素含量、POD活性和CAT活性等生理指标，统计分析不同抗旱小麦品种幼苗对干旱胁迫的响应。结果表明，干旱胁迫对不同抗旱小麦品种的各生理指标有显著的影响，其各表型值与对照(不加PEG的处理)差异显著，且品种间差异显著。随着PEG干旱胁迫的时间延长，所有供试抗旱小麦品种幼苗株高的抗旱系数、叶绿素a浓度、叶绿素b浓度和总叶绿素浓度均有不同程度的下降，而POD活性和CAT活性均显著上升。通过各小麦品种间各生理指标的比较可以看出，定西39号、宁春18号、西旱1号和定西41号表现出较强的抗旱性，而定西38号和外源11抗旱性较差。

PEG-6000(-0.50 MPa) are treated six drought resistant wheat varieties seedlings at the two-leaf and one-bud stage， simulated drought stress environment， wheat seedling plant height， relative water content， chlorophyll content， POD activity and CAT activity was measured in the third days and the 9th days after the drought stress treatment， respectively， the statistical analysis of wheat cultivars with different drought response to Drought Stress at seedling stage. The result shows that drought stress have significant effects on the physiological indexes of wheat varieties with different drought resistance， and their phenotypic values are significantly different from the control (without PEG treatment)， and there are significant differences among cultivars. With the increase of PEG drought stress time， all tested the drought resistance of wheat seedlings strains of high drought resistance coefficient and chlorophyll a concentration， chlorophyll b concentrations and total chlorophyll concentration are varying degrees of decline， and the activity of POD activity and CAT activity increased significantly. Through the comparison of the physiological indexes among different wheat varieties can be seen， Dingxi 39， Ningchun 18， Xi Han1 and Dingxi 41 showed a strong drought resistance， and Dingxi 38 and exogenous 11 had a poor drought resistance.

S512.1