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中国芒属植物抗寒性初步研究

摘要:

以13份具有地理代表性的芒属(Miscanthus Andersson)植物为材料,分别以5,0,-5,-10,-15,-20和-25℃共7个温度梯度进行冷冻胁迫,通过电导法测定电解质外渗率来评价各材料的抗寒性,并对供试材料半致死温度(LT50)与其原产地地理因子进行回归分析。结果表明:半致死温度(LT50)的变化范围为-2.92~-23.85℃,抗寒性由强到弱依次为C0429(-23.85℃) >D0341(-14.10℃) >B0534(-9.60℃) >B0121(-6.97℃) >A0502(-6.77℃) >A0110(-6.51℃) >B0120(-6.34℃) >B0605(-5.39℃) >A0107(-5.00℃) >C0517(-4.27℃) >B0145(-3.26℃) >C0128(-3.08℃) >C0129(-2.92℃),回归分析表明,半致死温度(LT50)与纬度和海拔成极显著负相关,说明芒属植物抗寒性与地理因子具有一定的相关性。研究结果将为芒属植物抗寒种质资源的筛选提供理论基础。

关键词: 芒属, 抗寒性, 电导率, Logistic方程

Abstract:

The leaves of thirteen Miscanthus Andersson accessions were taken as tested materials to study the cold resistances of them by the means of electrical conductivity method. Seven temperature gradients (5, 0,-5,-10,-15,-20,-25℃) were designed as freezing stresses. The line regressive relationships of LT50 with latitude and altitude were analyzed. The results showed that the variation range of LT50 was-2.92~-23.85 ℃, The cold resistance of tested samples ranked as C0429(-23.85℃) >D0341(-14.10℃) >B0534(-9.60℃) >B0121(-6.97℃) >A0502(-6.77℃) >A0110(-6.51℃) >B0120(-6.34℃) >B0605(-5.39℃) >A0107(-5.00℃) >C0517(-4.27℃) >B1045(-3.26℃) >C0128(-3.08℃) >C0129(-2.92℃). Regression analyses indicated that there were significant relationships between LT50 and latitude or altitude. These results provide a theoretical basis for the cold resistance screening of Miscanthus germplasm resource in China.

Key words: Miscanthus, Cold resistance, Electrical conductivity, Logistic equation

中图分类号: 

Q945.78

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