Abstract:

Taking Xinjiang wild onion and common welsh onion （Zhangqiu welsh onion and Japanese Yuanzang welsh onion）as test material，this paper studied the effects of drought stress on physiological indexes of 3 kind onions by potted water control method．The results showed that the overall growth of wild onion was weak，but with the decrease of the relative water content in soil，the changing range of morphological indicators，including plant height and leaf length of wild onion was small．The contents of soluble sugar, soluble protein，and proline in leaves and pseudostems of wild onion，root activity and antioxidant enzyme activity were all higher than those of common welsh onion．While，the increasing range of relative conductivity，MDA，H₂O₂ content were less than that of common welsh onion．And the increase range of soluble sugar，proline content，SOD，POD activity were greater than that of common welsh onion．The decreasing range of root activity was smaller than that of the common welsh onion．Based on various indicators，the drought resistance of wild onion is superior to that of Zhangqiu and Japanese Yuanzang welsh onion．

Key words: Drought stress, Wild onion, Common welsh onion, Physiological characteristics

摘要：

以新疆野葱与普通大葱（章丘大葱和日本元藏大葱）为试材，采用盆栽控水法研究干旱胁迫对3 种葱生理指标的影响。结果表明：野葱整体长势较弱，但随着土壤相对含水量的降低，野葱株高、叶长等形态指标变化幅度小；野葱叶片和假茎中可溶性糖、可溶性蛋白质、脯氨酸含量及根系活力、抗氧化酶活性均高于普通大葱，且相对电导率和MDA、H₂O₂ 含量增加幅度小于普通大葱，可溶性糖、脯氨酸含量和SOD、POD 活性增加幅度大于普通大葱，根系活力下降幅度低于普通大葱。综合各项指标，野葱的抗旱性优于章丘大葱和日本元藏大葱。

关键词: 干旱胁迫, 野葱, 普通大葱, 生理特性