摘要
[目的]探究2种百里香的抗旱机理。[方法]以英国百里香(Thymus vulgaris)和柠檬百里香(Thymus victorious)的种子为材料,采用不同浓度PEG-6000(5%、10%、20%和30%)模拟干旱胁迫,测定干旱胁迫下百里香种子的发芽率、发芽势及其幼苗的根长、茎长和叶面积指标。[结果]在5%的PEG-6000的干旱胁迫处理下,2种百里香的发芽率及幼苗根茎与对照组均无显著差异;10%的PEG-6000浓度处理对百里香种子的萌发与根系生长有一定的促进作用,而叶面积和幼苗茎均受到抑制作用,且对柠檬百里香的促进作用较大;随着干旱胁迫增加(≥10%),萌发指标、叶面积和茎长均受到抑制作用而降低,胁迫越大,降幅越大。[结论]一定程度的干旱胁迫可以促进百里香种子的萌发和根系的生长,且柠檬百里香的抗旱性强于英国百里香。
[Objective]The aim was to explore the drought resistence mechanism of thyme. [Methods]Taking the seeds of thyme varieties Thymus vulgar is and Thymus victorious as experimental materials, hy using different concentration PEG-6000 （5 %, 10 %,20 % and 30 %）to simulate drought stress conditions. In order to explore the drought resistance mechanism of thyme, we determined the seed germination rate, germination potential, and seedling root, shoot length and leaf area.[ Results]The results showed that under the 5% PEC,-6000 drought stress, treatment, two species of thyme varieties seeds germination rate and germination potential were not significant. Low concentration （10%） of PEG could promote the seeds germination and growth, leaf area and shoot length of thyme seedling were significantly inhibited. The seeds germination indexes, shoot length and leaf area were inhibited with the increase of drought stress （ 10 0% ）, and the greater the intensity of drought stress was, the more distinctly index changed. [Conclusion]A certain concentration of PEG could promote the seeds germination and root growth,and the drought resistance of Thymus vic- torious was much better than Thymus vuluaris.
出处
《山西农业大学学报（自然科学版）》
CAS
2016年第7期506-509,共4页
Journal of Shanxi Agricultural University(Natural Science Edition)
基金
山西省农业科技攻关项目(20140311013-4)
山西省高等学校教学改革项目(J2014030)
关键词
干旱胁迫
百里香
种子萌发
幼苗生长
Drought stress
Thyme
Seed germination
Seeding growth
