不同品种冬小麦的抗旱性鉴定与分析

Identification and analysis of drought resistance of different winter wheat cultivars

以13个抗旱等级不同的冬小麦品种为材料,设旱地和水地两种处理,在冬小麦起身期、拔节期、挑旗期、抽穗开花期、灌浆期、乳熟期测定了叶片相对含水量、叶绿素含量、叶片渗透调节能力、脯氨酸含量、丙二醛含量、SOD活性、POD活性等7个与抗旱相关的生理指标。计算各指标旱、水地差值绝对值,并与抗旱指数分别进行相关、逐步回归、通径、灰色关联分析。结果表明,挑旗期叶绿素含量差值、拔节期叶片渗透调节能力、起身期脯氨酸含量差值、拔节期丙二醛含量差值、灌浆期SOD活性差值等5个生理指标与冬小麦抗旱性显著相关,可作为抗旱鉴定指标。

With dry land and wet land treatments designed,thirteen winter wheat cultivars with different ranks of drought resistance were used as materials,seven physiological indices were monitored at setting stage,jointing stage,flag leaf stage,heading stage,flowering stage,filling stage and milk stage,which were relative leaf water content,chlorophyll content,ability of osmotic adjustment,praline content,MDA content,SOD activity and POD activity.Multiply partial correlations,stepwise regression,path analysis and gray correlative analysis were conducted between different values of various indices and drought index.The results showed that five indices including different values of chlorophyll content at flag leaf stage,ability of osmotic adjustment at jointing stage,different values of praline content at setting stage,different values of MDA content at jointing stage and different values of SOD activity at filling stage influnced significiantly the drought resistance and could be the indices to identify the drought resistance in winter wheat.