盐旱交叉胁迫对灰胡杨(Populus pruinosa)幼苗生长和生理生化特性的影响

Abstract

PDF HTML阅读 XML下载 导出引用 引用提醒 盐旱交叉胁迫对灰胡杨(Populus pruinosa)幼苗生长和生理生化特性的影响 DOI: 10.5846/stxb201710101805 作者: 作者单位: 中国科学院新疆生态与地理研究所,中国科学院新疆生态与地理研究所,四川师范大学,中国科学院新疆生态与地理研究所,中国科学院新疆生态与地理研究所 作者简介: 通讯作者: 中图分类号: 基金项目: 中科院与地方科技合作项目（2014Y552031001）；塔里木油田分公司科技项目（971014060006）；新疆重大科技专项（2016A03008-3）；塔里木油田公司科技项目（971014060006）；水利部公益性行业科研专项（201401049） Growth, physiological and biochemical characteristics of Populus pruinosa seedlings under salt-drought stress Author: Affiliation: XINJIANG INSTITUTE OF ECOLOGY AND GEOGRAPHY，CHINESE ACADEMY OF SCIENCES,XINJIANG INSTITUTE OF ECOLOGY AND GEOGRAPHY，CHINESE ACADEMY OF SCIENCES,,XINJIANG INSTITUTE OF ECOLOGY AND GEOGRAPHY，CHINESE ACADEMY OF SCIENCES, Fund Project: 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:以一年生灰胡杨幼苗为试验材料，利用田间控盐控水的方法，进行干旱和盐胁迫试验，通过测定生长和生理生化指标探讨幼苗在盐旱交叉胁迫下的生长发育及适应规律，旨在阐明干旱及盐交叉胁迫下植物抗旱抗盐机理。研究结果表明：在盐、旱及交叉胁迫下，灰胡杨幼苗抗氧化酶活性、MDA和脯氨酸含量与对照存在显著差异（P < 0.05）。（1）在8、11 g/L和15 g/L盐处理下，灰胡杨幼苗相对高生长、相对枝长和冠幅增量均受到抑制，且差异显著（P < 0.05），而干旱胁迫和盐旱交互胁迫下差异不显著。（2）在盐胁迫、盐旱交叉胁迫下，随着胁迫程度的加重，抗氧化酶SOD、POD、CAT活性表现出先增加后降低的趋势，三者协调一致；仅干旱胁迫时，抗氧化酶SOD、POD、CAT活性显著增加；（3）在盐、旱及其盐旱交叉胁迫下，脯氨酸含量呈上升趋势，MDA含量则表现出先降低后升高趋势，这与抗氧化酶活性先升高后降低的趋势相对应。因此，抗氧化酶活性对缓解脂膜过氧化的伤害具有一定限度，MDA含量与抗氧化酶活性呈负相关，灰叶胡杨幼苗在盐旱交叉胁迫下表现出一定的耐性。 Abstract:Using annual Populus pruinosa seedlings as the test material, an experiment of drought and salt stress was carried out by using field salt and water control methods. Growth, physiological, and biochemical indices were used to investigate the growth and adaptation of seedlings under combined salt-drought stress. The results showed that compared to the control group, there were significant differences in the antioxidant enzyme activity, and the MDA and proline contents between Populus pruinosa seedlings under salt, drought and cross-stress. (1) The relative growth of the Populus pruinosa seedlings was significantly inhibited under salt treatments of 8, 11 g/L and 15 g/L, (P < 0.05), while there was no significant difference between drought stress and salt stress. (2) Under salt-drought stress, the activities of antioxidant enzymes SOD, POD, and CAT first increased and then decreased with an increase in the degree of stress, and the difference was significant; the activities of SOD, POD, and CAT were significantly increased under drought stress; (3) Under the conditions of salt, drought, and cross-stress, the MDA content first decreased and then increased, which was in accordance with the trend of increasing the activity of antioxidant enzymes and then decreasing. The proline content increased with significant difference (P < 0.05). Therefore, the activity of antioxidant enzymes has a certain limit on the damage of lipid peroxidation, while the MDA content is negatively correlated with antioxidant enzyme activity, and Populus pruinosa showed some tolerance under salt-drought stress. 参考文献 相似文献 引证文献