学术论文

      陕北黄土丘陵沟壑区主要植物种子对干旱胁迫的萌发响应及抗旱性评价

      Evaluation of germination response and the resistance of main plant species seedling to drought stress in the hill-gullied Loess Plateau region of northern Shaanxi

      摘要:
      陕北黄土丘陵沟壑区土壤水分匮乏是影响植被恢复的重要因素,而干旱胁迫对种子萌发的制约是植物自然更新的关键限制因子.本研究通过设置不同浓度梯度聚乙二醇(PEG-6000)溶液模拟不同的干旱胁迫条件,测定黄土高原丘陵沟壑区16种主要植物种子的萌发特性及抗旱性.结果表明,随PEG浓度的增加,16种植物种子的萌发均受到不同程度的抑制,种子的萌发时滞延长直至不萌发,种子的发芽势、发芽率、发芽指数和抗旱指数均呈下降趋势.而轻度的干旱胁迫(50 g·L-1)能促进部分种子的萌发,增加种子发芽率和发芽势.采用隶属函数法对16种植物种子的相对发芽势、相对发芽率、相对发芽指数和抗旱指数进行综合评价,结果发现,鬼针草(Bidens pilosa)、猪毛蒿(Artemisia scoparia)、狗尾草(Setaria viridis)种子萌发耐旱性最强,而大针茅(Stipa grandis)最弱.
      Abstract:
      In the hill-gullied Loess Plateau region of northern Shaanxi,lack of soil water is a dominant factor affecting vegetation restoration,and the effect of drought stress on seed germination is a key limiting factor for plant regeneration.This experiment was conducted to estimate the seed germination characteristics and drought resistance of 16 main plant species in the hill-gullied Loess Plateau region.Different concentrations of polyethylene glycol (PEG-6000) solution were used to simulate the drought stress in this study.The results showed that germination of all seeds was subjected to different degrees of inhibition with the increase of PEG concentration.Generally,with drought stress increase,the seed germination time lag was prolonged,or even the seeds did not germinate,and the germination potential,germination rate,germination index,and drought resistance index of all seeds tended to decline.However,slight drought stress (50 g · L-1) promoted the germination of some seeds and increased seed germination potential and germination rate.The comprehensive evaluation of the relative germination potential,relative germination rate,relative germination index,and drought resistance index of 16 species by the membership function method indicated that the drought resistance of Bidens pilosa,Artemisia scoparia,and Setaria viridis was the strongest,and that of Stipa grandis was the weakest.
      作者: 葛芳红 [1] 王宁 [2] 胡澍 [3] 周正朝 [1] 蒋平海 [1]
      Author: Ge Fang-hong [1] Wang Ning [2] Hu Shu [3] Zhou Zheng-chao [1] Jiang Ping-hai [1]
      作者单位: 陕西师范大学地理科学与旅游学院,陕西西安,710119 陕西师范大学地理科学与旅游学院,陕西西安710119;黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西杨凌712100 黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西杨凌,712100
      刊 名: 草业科学 ISTICPKU
      年,卷(期): 2018, 35(2)
      分类号: S330.3 Q945.78
      在线出版日期: 2018年5月9日
      基金项目: 国家自然科学基金项目,黄土高原土壤侵蚀与旱地农业国家重点实验室开放基金