水分胁迫下黄瓜生理生化的变化与抗旱性的关系

Correlations between Physiological and Biochemical Changes and Drought Resistance under Water Stress

以津优3号、津优2号和bh-8三个黄瓜品种为试材,研究了水分胁迫下三个黄瓜品种在初果期、盛果期、结果末期的理化性状变化及其与产量抗旱指数(DAI)的关系,结果发现:初果期抗旱指数高的津优3号经水分胁迫后表现为脯氨酸、可溶性糖含量高,且增加幅度大,丙二醛含量低,增加幅度小;抗旱指数低的hb-8初果期脯氨酸、可溶性糖含量较低,增加幅度小或略有降低,丙二醛含量高,增加幅度大。盛果期,结果末期三个黄瓜品种各生理指标的变化与抗旱指数吻合较差。整个生育期内可溶性蛋白的变化均不明显。综合认为:初果期脯氨酸、可溶性糖、丙二醛含量及变化能够在一定程度上体现黄瓜的抗旱性,因此可以作为黄瓜品种抗旱性的辅助鉴定指标。

Jinyou No.3、Jinyou No.2 and bh-8 cucumber cultivars were used as materials to study the changs of physical and chemical properties and their correlation with the yield drought index（DAI） under water stress in early fruit stage,blooming fruit stage,late fruit stage.The results showed that：in early fruit stage,soluble sugar and proline content of the hardiest Jinyou No.3 were highest,rised significantly,MDA content was lowest,rised slightly;soluble sugar content and proline conten of drought-sensitive hb-8 were lowest,rised or decrease slightly,MDA content was highest,rised significantly.In blooming fruit stage and late fruit stage,physiological and biochemical changes of cu-cumbers did not coincide with the drought-tolerant index.During the whole growing period soluble protein content changed slightly.Comprehensive view was changs of proline content,soluble sugar and MDA could reflect the drought resistance of cucumber to some extent,they could be used as assisted Identification of indicators of drought resistance in cucumber.