陕西麦区小麦品种萌发期抗旱性分析

摘要

以21份陕西主栽小麦品种为材料,采用20% PEG-6000溶液模拟干旱胁迫,研究了小麦萌发期发芽势等8个指标的变化,并进行抗旱性综合分析.结果表明:(1)PEG胁迫后,发芽势、发芽率、初生根条数、胚根长、胚芽长、芽鲜重、根鲜重和全株鲜重等均有不同程度降低,其降幅依次为21.32%、11.32%、23.59%、40.54%、71.81%、65.39%、25.93%和39.45%;(2)通过隶属函数法分析,依据综合抗旱性D值筛选出晋麦47为强抗旱性品种,商麦5226、陕农138、陕旱981、长武134、商麦1619、小偃15、西农979和西农2000为中等抗旱性品种,郑麦9023和秦麦9号为不抗旱品种,其余为弱抗旱性品种.%The germination potential and 7 other indexes of 21 mainly-planted wheat varieties during germination in Shaanxi were measured under drought stress simulated with 20% PEG-6000 solution, and the comprehensive evaluation of drought resistance of each variety was conducted by using membership function method.The resulted showed that: (1) After PEG stress, the germination potential, germination rate, radicle number, radicle length, coleoptile length, fresh bud weight, fresh root weight, and total plant fresh weight of wheat were reduced by 21.32%, 11.32%, 23.59%, 40.54%, 71.81%, 65.39%, 25.93% and 39.45%, respectively;(2) Through membership function analysis, according to the comprehensive drought resistance index D, Jinmai 47 was identified to be strongly resistant to drought;Shangmai 5226, Shannong 138, Shanhan 981, Changwu 134, Shangmai 1619, Xiaoyan 15, Xinong 979 and Xinong 2000 had a medium drought resistance;Zhengmai 9023 and Qinmai No.9 had no drought resistance;the other varieties were weakly resistant to drought.