扁蓿豆萌发对干旱胁迫的响应及抗旱性评价

Response of seed germination of Melilotoides ruthenica to drought stress and its drought resistance evaluation

以不同浓度聚乙二醇(PEG 6000)溶液(0、10%、15%、20%和25%)模拟干旱胁迫条件,对不同生态区的6份扁蓿豆种质材料种子萌发及幼苗生长特性进行了研究。结果表明,随着干旱胁迫的加剧,6份扁蓿豆种子的发芽率、发芽势、发芽指数、活力指数、芽长、根长及幼苗干质量均呈下降趋势,而根长与芽长的比值则逐渐增大;采用聚类分析和隶属函数法对干旱胁迫下扁蓿豆种子萌发期的抗旱性进行了综合评价,得出来源于通辽市大青沟自然保护区的02972及包头市土默特右旗的02988和03056的抗旱性较强,而呼和浩特市武川县的02982抗旱性最差。

The six kinds of germplasm materials of Melilotoides ruthenica from different ecological regions was used to evaluate their seed germination and seedling growth under simulation drought resistance condition with PEG solution.This study indicated that the seed germination rate,germination energy,germination index,vigor index,bud length,root length and seedling dry weight decreased,however,the ratio of root length and bud length gradually increased as the drought stress increased.Evaluation on drought resistance of M.ruthenica germplasms by using cluster analysis and subordination function method showed that the germplasm materials entitled 02972 derived from the Daqinggou Nature Reserve of Tongliao City,and the germplasm materials entitled 02988 and 03056 derived from the Right Tumete Banner of Baotou City had strong drought resistance and the germplasm materials entitled 02982 derived from the Wuchuang County of Hohhot City was poor for drought resistance.