猪屎豆种质资源萌发期的耐旱性评价

Evaluation of Drought Tolerance of Crotalaria pallida in Germination Period

为筛选耐旱性强的优异猪屎豆种质,本研究采用质量分数为15%的聚乙二醇(PEG-6000)溶液模拟干旱环境,以相对发芽势、相对发芽率、萌发耐旱指数、相对胚根长、相对苗高和活力指数作为评价指标,利用隶属函数法对228份猪屎豆种质资源的萌发期耐旱性进行综合评价。根据6个评价指标的平均隶属函数值将猪屎豆资源的耐旱性分为5个等级,其中耐旱等级为Ⅰ级的种质1份,来源于云南元江,平均隶属函数值为0.8;Ⅱ级种质13份,0.6≤平均隶属函数值<0.8;Ⅲ级种质105份,0.4≤平均隶属函数值<0.6;Ⅳ级种质105份,0.2≤平均隶属函数值<0.4;Ⅴ级种质4份,其平均隶属函数值小于0.2。

The relative germination potential,relative germination rate,germination drought tolerance index,relative radicle length,relative seedling height and vigor index were used as the evaluation indexes to evaluate the drought tolerance of 228 accessions of Crotalaria pallida.According to the average membership function values of the six evaluation indexes,the drought tolerance of the resources was divided into five grades.Among them,one accession germplasm with drought tolerance grade I came from Yunnan,with an average membership function value 0.8,13 accessions with drought tolerance grade II had an average membership function value less than 0.8,greater than or equal to 0.6,105 accessions with drought tolerance gradeⅢhad an average membership function value less than 0.6,greater than or equal to 0.4,105 accessions with drought tolerance grade IV had an average membership function value less than 0.4,greater than or equal to 0.2,four accessions with drought tolerance grade V had an average membership function value less than 0.2.