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Zn2+与干旱交叉胁迫对当归种子萌发和幼苗生理特性的影响
叶文斌
0
(陇南师范高等专科学校 农林技术学院,成县 742500)
摘要:
以甘肃道地中药材当归(Angelica sinensis)为对象,通过室内砂培方法,研究不同浓度 (10-6 、10-4 和10-3 mol·L-1) Zn2+和不同浓度(5%、10%、15%、20%和30%)PEG模拟干旱胁迫下对当归种子萌发、幼苗生长、渗透调节物质积累和活性氧代谢的影响。结果表明,低浓度Zn2+和PEG能显著促进当归种子萌发和幼苗生长;随着干旱胁迫的加剧和Zn2+浓度的提高,种子萌发率显著降低,幼苗生长受阻,叶片O2·产生速率和H2O2含量明显增加,SOD、POD、CAT和APX活性先升后降;高浓度 Zn2+和PEG处理下GSH和AsA含量明显降低,幼苗叶片中Pro、可溶性糖和MDA含量随Zn2+和PEG浓度升高而升高。
关键词:  Zn2+  PEG  当归  渗透调节物质  活性氧代谢
DOI:10.13610/j.cnki.1672-352x.20150302.028
投稿时间:2014-12-22
基金项目:甘肃省中青年基金(3YSO61-A25-030), 甘肃省教育厅项目(0928B-1)和陇南师范高等专科学校重点项目(2014LSZK01001)共同资助。
Effect of Zn2+ and drought on seed germination and seedling physioloyical characters of Angelica sinensis
YE Wenbin
(School of Agriculture and Forestry Technology, Longnan Teachers College ,Chenxian 742500)
Abstract:
A sand culture experiment was conducted to study the effects of of Zn2+ at different concentrations (10-6, 10-4 and 10-3 mol·L-1) and PEG-6000(5%, 10%, 15%, 20% and 30%)on seed germination, seedling growth, osmotica accumulation, and active oxygen metabolism of Angelica sinensis, an authentic Chinese herbal from Gansu. The results showed that a low concentration of Zn2+ and PEG significantly enhanced seed germination and seedling growth With the increasing Zn2+ and PEG concentrations, the germination percentage significantly decreased and the seedling growth was significantly inhibited. At the same time, the leaf O2·production rate and H2O2 content dramatically increased and the activities of superoxide dismutase, peroxidase, catalase, and ascorbate peroxidase decreased after an initial increase. The contents of glutathione and ascorbic acid in the leaf decreased markedly, while the leaf proline, soluble sugar, and malonaldehyde contents had a significant increase with an increase of the concentrations of Zn2+ and PEG.
Key words:  Zn2+  PEG   Angelica sinensis  osmotica  active oxygen metabolism

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