苜蓿品种抗寒性与秋眠级的相关性研究

Correlation between the cold resistance of alfalfa varieties and their fall dormancy

以16个低秋眠级的苜蓿品种为材料,采用盆栽土培法,通过低温胁迫研究各品种的抗寒性,并采用主成分分析法和隶属函数法对苜蓿抗寒性做出综合评价,应用线性回归法对苜蓿抗寒性与秋眠级指数进行回归分析,探明苜蓿抗寒性与秋眠级的相关性。结果表明:16个不同来源的苜蓿品种,龙牧801与龙牧806相比其他苜蓿品种抗寒性最佳,甘农2号的抗寒性次之,而巨能551的抗寒性最差;苜蓿抗寒性与其秋眠级指数显著负相关(R^2=0.92),秋眠级指数越低,苜蓿的抗寒能力越强,因此在引种与生产中利用秋眠特性对苜蓿抗寒性进行预判具有一定的实际意义。

The lack of high-quality leguminous pasture resources has become a factor that limiting the production and sustainable development of high-quality pastures in the cold regions of northern China.In this study,16 low fall-dormancy alfalfa cultivars were used as materials to study their cold resistance by pot of soil culture.At the same time,principal component analysis and membership function method were used to evaluate the cold resistance,and regression analysis of alfalfa cold resistance and fall dormancy grade was conducted by linear regression method.The purpose of this study was to selected high cold resistant alfalfa cultivars that can be planted in cold areas,and explore the correlation between cold resistance and fall-dormancy grade.The results showed that Longmu 801 and Longmu 806 had the best cold resistance compared to other alfalfa cultivars among the 16 alfalfa cultivars.The cold resistance of Gannong NO.2 was followed Longmu 801 and Longmu 806,and the cold resistance of Juneng 551 was the worst.There was a significant negative correlation between cold resistance and fall dormancy index of alfalfa(R^2=0.92),the fall-dormancy was lower,the cold resistance was stronger of alfalfa.Therefore,It has the practical value to predict the cold resistance of alfalfa by using fall-dormancy characteristics in the introduction and production.