PEG模拟干旱胁迫下12份新疆野生无芒雀麦种质萌发期抗旱性评价

Evaluation of drought resistance for 12 Bromusinermis germplasms in Xinjiang under PEGstress at germination stage

摘要:

以15%聚乙二醇(PEG-6000) 模拟干旱胁迫,对采自新疆天山北坡不同区域的12份野生无芒雀麦种质材料的发芽率、发芽势、发芽指数及幼苗生长指标进行测定,并以各个指标的相对值作为抗旱性评价指标,采用隶属函数法对供试无芒雀麦种质的抗旱性进行综合评价。结果表明:15% PEG胁迫降低了发芽率、发芽势和发芽指数,抑制胚芽和胚根的生长。通过隶属函数法综合评价,筛选出萌发期抗旱性强的种质为B10、B11和B12,B01、B02、B04、B05、B06、B07、B08和B09抗旱性中等,B03抗旱性弱。

Abstract:

15% polyethylene glycol (PEG-6000) was used to simulate drought stress,the germination rate,germination energy,germination index,and seedling growth index of 12 wild Bromus inermis germplasms collected from different regions on the northern slope of Tianshan Mountain in Xinjiang were measured.And the relative value of each index was taken as evaluation index of drought resistance,the drought resistance of B.inermis germplasms were evaluated with subordinate function method.The results showed that the germination rate,germination energy,and germination index of B.inermis germplasms decreased generally under 15% PEG stress,and the growth of germ and radicle was inhibited.According to the comprehensive evaluation of subordinate function method,B10,B11 and B12 showed a strong drought resistance,B01,B02,B04,B05,B06,B07,B08 and B09 showed a medium drought resistance,and B03 showed a weak drought resistance at germination stage.