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作者	单位
张军，李晓萍，陈新宏，孙树贵，鲁敏，王亮明，赵继新，武军，杨群会	（1.西北农林科技大学农学院，陕西杨凌 712100 2.陕西省兴平市种子管理站，陕西兴平 713100）

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中文摘要:

为明确冬小麦在扬花期对长期土壤干旱的生理生化响应及其与抗旱性的关系，以西农979等7个品种为材料，测定和分析了干旱胁迫条件下小麦扬花期功能叶部分生理生化指标和根系活力，并利用主成分分析、聚类分析对其抗旱性进行综合评价。结果表明，长期中度和严重干旱下，扬花期小麦功能叶片超氧化物歧化酶(SOD)活性、过氧化物酶(POD)活性、丙二醛(MDA)含量、质膜相对透性、可溶性糖含量、脯氨酸含量和胞间CO₂浓度均不同程度上升，根系活力、净光合速率、气孔导度和蒸腾速率均不同程度下降，可溶性蛋白含量的变化则因品种不同表现不一。通过综合分析，7个品种中，晋麦47和小偃22抗旱性较强，矮抗58、西农979、西农509抗旱性中等，郑麦9023和郑麦36 抗旱性较弱。

英文摘要:

This paper aims at probing the biochemical response and drought resistance of winter wheat at flowering stage under soil drought. Taking Xinong 979 and other 6 winter cultivars as test materials, some biochemical indexes of functional leaves and root activity were measured at flowering stage after long term soil drought, and their drought resistance was comprehensively evaluated by the methods of principal component analysis and cluster analysis. The results showed that under moderate drought and serious drought, SOD activity, POD activity, MDA content, relative membrane permeability, soluble sugar content, proline and intercellular CO₂ concentration all increased, while the root vigor, net photosynthesis rate, stomatal conductance and transpiration rate all decreased, while the content of soluble protein increased or decreased to some extent. Based on principal component analysis and cluster analysis, the 7 tested cultivars were divided into 3 groups with Jinmai 47 and Xiaoyan 22 as high drought resistance group, Aikang 58, Xinong 979 and Xinong 509 as medium drought resistance group, and other 2 cultivars, Zhengmai366 and Zhengmai 9023 as low drought resistance group.

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