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中国农学通报

中国农学通报 ›› 2012, Vol. 28 ›› Issue (21): 63-69.doi: 10.11924/j.issn.1000-6850.2012-0442

所属专题： 生物技术； 小麦

• 农学 农业基础科学 • 上一篇    下一篇

水分胁迫对不同抗旱性燕麦品种根部生理特性的影响

张娜 赵宝平 任鹏 刘景辉 王莹   

  • 收稿日期:2012-02-16 修回日期:2012-04-18 出版日期:2012-07-25 发布日期:2012-07-25
  • 基金资助:

    国家自然基金科学项目

Effect of Water Stress on Physiological Characteristics in Root of Different Oat Cultivars

  • Received:2012-02-16 Revised:2012-04-18 Online:2012-07-25 Published:2012-07-25

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摘要：

为了了解燕麦抗旱生理机制，以抗旱性不同的燕麦品种‘蒙燕1号’和‘坝莜3号’为试验材料，采用盆栽方式，研究拔节期和抽穗期水分胁迫对不同抗旱性燕麦品种根部生理特性的影响。结果表明，在拔节期抗旱品种‘蒙燕1号’在重度胁迫下根部可溶性蛋白合成受抑制，弱抗品种‘坝莜3号’在中度胁迫下就受到抑制，在抽穗期随着水分胁迫加剧，弱抗品种‘坝莜3号’可溶性蛋白含量下降幅度大于抗旱品种‘蒙燕1号’；在2个生育时期，可溶性糖、丙二醛(MDA)、过氧化物酶(POD)活性和相对电导率均随胁迫梯度加剧而升高；重度胁迫下丙二醛(MDA)在拔节期和抽穗期，‘蒙燕1号’分别上升了39.79%、14.88%，而‘坝莜3号’分别上升了188%、45.98%；在拔节期重度胁迫下，‘蒙燕1号’的POD活性上升27.4%，而‘坝莜3号’上升了98%；抽穗期，在中度胁迫下‘坝莜3号’品种的超氧化物歧化酶(SOD)活性下降33.16%，而‘蒙燕1号’品种仍维持较高水平仅下降4.05%。综合分析表明，拔节期，中度胁迫下抗旱品种‘蒙燕1号’的根部生理特性受影响较小，具有较优的抗旱生理特性。

关键词: 抑菌活性, 抑菌活性

Abstract:

The potted experiment were carried out to study the effect of different water stresses on physiological characteristics in root of different oat cultivars ‘Bayou3’ and ‘Mengyan1’, which different in drought resistance, at jointing stage and heading stage, and also to seek the response of water stress on physiological characteristics of different oat cultivars. The results showed that, at jointing stage, protein synthesis of drought resistance cultivar Mengyan1 in root was blocked at severe stress, but weak resistance cultivar ‘Bayou3’ was blocked at moderate stress; at heading stage, as water stress intensified, the protein content of weak resistance ‘Bayou3’ decreased more than that of ‘Mengyan1’; as water stress intensified, MDA content, protective enzyme activity (POD, SOD), REC and soluble sugar increased at two stages, and weak resistance cultivar ‘Bayou3’ increased more; under severe stress, MDA content of ‘Mengyan1’ increased 39.79%, 14.88%, but that of ‘Bayou3’ increased 188% and 45.98% respectively at jointing stage and heading stage. The SOD activity of ‘Mengyan1’ just increased 27.4%, but that of ‘Bayou3’ increased 98% under severe stress at jointing stage; the SOD activity in root decreased significantly at moderate water stress, which was 33.16%, but that of ‘Mengyan1’ still kept high level only decreased 4.05% at heading stage. In short, under moderate water stress, drought resistance cultivar ‘Mengyan1’ on root physiological characteristics affected less, had better drought resistance physiological characteristics at jointing stage.