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[目的]研究自然条件下选育的3种不同耐寒番茄品系的耐寒指标及其生理特性。[方法]以苗龄21～28 d的番茄幼苗为材料,通过实验室冷处理模拟外界环境条件,鉴定植株的存活及生长状况;研究植株离体叶片冷处理恢复后的形态变化并测定相对电导率,鉴定不同品系番茄植株的耐寒程度,分析电导率与存活率的相关性;测定冷胁迫条件下番茄植株体内可溶性糖和脯氨酸含量变化。[结果]不同品系的番茄冷处理后,叶片形态变化、电导率大小、恢复后的生长状况存在较大差异;不同品系番茄植株体内可溶性糖含量变化差异显著,脯氨酸含量变化差异不显著。[结论]冷处理条件下不同品系番茄叶片的电导率与存活率存在一定相关性,植株耐寒性与可溶性糖含量的积累有关。
[Objective] The study aimed to study the cold tolerance index and physiological characteristics of three different cold-tolerant tomato lines bred under natural conditions. [Method] With tomato seedlings aged from 21 to 28 days as materials, the survival and growth status of plants were identified by laboratory cold treatment to simulate the external environmental conditions. The morphological changes of detached leaves after cold treatment were studied and the relative conductivity, To identify the cold tolerance of tomato plants in different lines, the correlation between conductivity and survival rate was analyzed. The contents of soluble sugar and proline in tomato plants under cold stress were measured. [Result] After cold treatment, the leaf morphological changes, the conductivity and the growth status were different after different cold treatments. The content of soluble sugar in different tomato cultivars was significantly different but the content of proline was not significantly different. [Conclusion] There was some correlation between the conductivity and survival rate of tomato leaves under different cold treatments. The cold tolerance of plants was related to the accumulation of soluble sugar content.