PEG胁迫下15份紫云英种质材料萌发期的抗旱性鉴定

摘要

以不同渗透势的PEG-6000溶液模拟干旱胁迫条件,对15份不同来源的紫云英(Astragalus sinicus)种质材料的萌发特性和抗旱能力进行了研究.结果表明:(1)低浓度的PEG胁迫对部分紫云英种质的种子萌发有一定的促进作用；(2)PEG胁迫加剧会导致紫云英种子的发芽率、萌发抗旱指数、活力指数下降,而胚根/胚芽比值上升；(3)PEG浓度达到20％时所有紫云英种质的种子均不能萌发；(4)运用模糊数学隶属函数法对15份紫云英种质材料进行综合评价,发现其抗旱性强弱顺序为,萍宁3号＞湘肥2号＞南京芦庄紫云英＞浙紫62-18＞常山紫云英＞兵库紫云英＞金沙紫云英＞南充紫云英＞78-7＞青浦紫云英＞73-129＞72-24＞清江紫云英＞78-18＞78-1-1.%The germination characteristics and drought resistance of 15 accessions of Astragalus sinicus L. germplasm materials were studied under different osmotic potentials (PEG-6000). The results showed as follows: (1) Low concentration of PEG improved seed germination of some Astragalus sinicus germplasm materials. (2) As the drought intensified, seed germination of all Astragalus sinicus germplasm materials was suppressed. Germination rate, drought resistance index and vigor index declined, while root/ shoot ratio increased. (3) All Astragalus sinicus germplasm materials failed to germinate when the concentration of PEG reached 20%. (4) According to the comprehensive evaluation value of drought resistance, 15 accessions of Astragalus sinicus germplasm materials were ordered below: Pingning 3 > Xiangfei 2 > Nanjing Luzhuang > Zhezi 62-18 > Changshan > Bingku > Jinsha > Nanchong > 78-7 > Qingpu > 73-129 > 72-24 > Qingjiang > 78-18 > 78-1-1.