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干旱胁迫对窄叶鲜卑花种子萌发及幼苗生长的影响
陈叶1,2, 闫芳1,2, 马银山1,2, 罗光宏2,3
1.河西学院 农业与生物技术学院, 甘肃 张掖 734000;2.甘肃省河西走廊特色资源利用省级重点实验室, 甘肃 张掖 734000;3.甘肃省微藻开发中心, 甘肃 张掖 734000
摘要:
[目的] 研究干旱胁迫对窄叶鲜卑花种子萌发及幼苗生长的影响,为野生种驯化和种群恢复提供参考。[方法] 以窄叶鲜卑花种子为实验材料,采用不同浓度聚乙二醇(PEG-6000)模拟干旱胁迫环境,研究干旱协迫强度对窄叶鲜卑花种子的吸胀速率、发芽率、发芽势、发芽指数、活力指数和种子抗旱萌发指数及幼苗生长情况的影响。[结果] 随着干旱胁迫程度的加剧,窄叶鲜卑花种子的吸水过程表现出急速吸水期、缓慢上升期和吸水平稳期3个阶段;其发芽率、发芽势、发芽指数、活力指数和种子抗旱萌发指数及苗高、根长,苗重与胁迫强度均呈负相关;当PEG浓度达30%时,种子萌发完全被抑制。另一方面,种子群体萌动、萌发和出苗达50%所需时间随胁迫强度的增加而越发延迟,且各阶段对环境临界水势要求不同,出苗阶段最为严格,表明种子出苗过程对环境水分胁迫较为敏感,耐旱能力较弱。[结论] 干旱胁迫显著抑制了窄叶鲜卑花种子的萌发和幼苗生长,也说明水分是窄叶鲜卑花种子萌发和幼苗形成的主导因素之一,在较干旱地区种植需要考虑水分的供给。
关键词:  窄叶鲜卑花  干旱胁迫  种子萌发  聚乙二醇
DOI:10.13961/j.cnki.stbctb.2018.06.005
分类号:
基金项目:国家自然科学基金项目“环境条件和放牧干扰对肃南草地物种多样性影响机制的研究”(31660161)
Effects of Drought Stress on Seed Germination and Seedling Growth of Sibiraea Angustata
CHEN Ye1,2, YAN Fang1,2, MA Yinshan1,2, LUO Guanghong2,3
1.College of Agriculture and Biotechnology, Hexi University, Zhangye, Gansu 734000, China;2.Key Provincial Laboratory of Universities in Gansu Province for Characteristic Resources Utility in Hexi Corridor, Zhangye, Gansu 734000, China;3.Kaiyuan Bio-tech Development Center, Zhangye, Gansu 734000, China
Abstract:
[Objective] The effects of drought stress on the seed germination and seedling growth of Sibiraea angustata was investigated in order to provide reference for wild species domestication and population recovery.[Methods] To study the swellingrate, germination percentage, germination potential, germination index, vigor index, seed drought germination index and seedling growth in Sibiraea angustata under different concentrations of polyethylene glycol(PEG-6000) treatments.[Results] With the intensification of the stress level, the absorption process of the seeds of narrow leaves Sibiraea angustata showed three stages:rapid water absorption period, slow rising period and water absorption period, and the germination rate, germination potential, germination index, vigor index and seed drought-resistance germination index, seedling height and root length, and the seedling weight were negatively correlated with the stress intensity. When the polyethylene glycol concentration reached 30%, the germination of seed was inhibited completely. On the other hand, seed germination and emergence, and 50% of the time delay were decreased with the increase of stress intensity. Among them, the most stringent stage is emergence stage, seed emergence process of environmental was more sensitive, and drought capability is weak.[Conclusion] Drought stress significantly inhibited the seed germination and seedling growth, it also suggested that water is one of the dominant factor for the formation of seed germination and seedling growth. Therefore, planting Sibiraea angustata in the arid areas requires consideration of water supply.
Key words:  Sibiraea angustata  drought stress  seed germination  polyethylene glycol