盐分和水分胁迫对金叶白蜡幼苗生长及生理生化特性的影响

Effect of Salt Stress on Growth and Physiological and Biochemical Characteristics of Fraxinus chinensis under Varying Soil Water Content

采用温室盆栽试验方法,研究了不同土壤水分下盐胁迫对金叶白蜡幼苗的生长及生理生化特性的影响。结果表明:土壤盐分胁迫下金叶白蜡幼苗的生长发生了显著的变化,这种变化又因土壤含水量的不同而不同。金叶白蜡相对高生长、相对地径生长、相对冠幅以及生物量增量随着土壤盐分浓度的增加和土壤水分含量的减少而减少,表明盐分和水分胁迫影响了金叶白蜡的生长。生理生化分析表明:叶片中游离脯氨酸含量、可溶性糖含量、可溶性蛋白质含量、相对质膜透性随着土壤盐分浓度的增加和土壤水分含量的减少而增大,但MDA含量随着土壤盐分浓度的增加和土壤水分含量的减少而有减少趋势。

The seedlings of Fraxinus chinensis were grown in a pot under greenhouse conditions with varying soil water content, The results showed that there were significant effects of soil water and salt contents on growth and biochemical characteristic of F. chinensis. The relative height growth, relative ground diameter growth, relative crown diameter and biomass increment decreased with increase of soil salt content and decrease of soil water content. The contents of profine, soluble sugar, soluble protein raised with increase of soil salt content under the soil condition of flooding, while the contents of MDA decreased.