摘要： 研究番茄亚低温(15℃)种子发芽特性和幼苗抗冷性的相关性,为番茄抗冷种质资源的快速鉴定提供技术依据。以6个番茄品种为试材,测定亚低温种子的发芽特性和低温(12℃/8℃)幼苗的生理生化变化,对各抗冷性指标进行相关性分析。结果表明:亚低温发芽率与幼苗冷害指数呈显著的负相关(r=-0.781 7^*);冷害指数与低温(12℃/8℃)处理3 d的叶绿素含量呈极显负相关(r=-0.914 4^**),与低温处理6 d电解质渗透率和可溶性糖含量呈显著负相关(r=-0.773 6^*,r=-0.760 8^*),与处理6 d SOD活性呈极显著负相关(r=-0.967 7^**)。亚低温下番茄种子发芽特性与幼苗抗冷性具有较好的一致性,15℃处理12 d的番茄种子发芽率可作为快速鉴定番茄幼苗抗冷性的指标。

关键词: 番茄, 亚低温发芽特性, 幼苗抗冷性, 相关性研究

Abstract: To provide guidelines for rapid identify of different cold resistance of tomato germplasm,the correlation between germination rate of tomato seeds under suboptimal temperature and cold-resistant of tomato seedlings was investigated.Our results showed that there was a negative correlation between the germination rate of tomato seeds under suboptimal temperature and chilling index of tomato seedlings(r=-0.781 7^*).Whereas the chilling index of tomato seedlings showed significant negative correlated with the chlorophyll content of tomato seedlings leaves treated under cold temperature(12℃/8℃) for 3 days(r=-0.914 4^**) and SOD activities of tomato seedlings leaves treated under cold temperature(12℃/8℃)for 6 days in addition,the chilling index of tomato seedlings was negative correlated with the relative permeability of cell membrane and soluble sugar content of tomato seedling leaves treated under cold temperature(12℃/8℃) for 6 days(r=-0.773 6^*,r=-0.760 8^*).In conclusion,the germination rate of Germination rate;tomato seeds under suboptimal temperature was correlated with cold resistance of tomato seedlings and the germination rate under 15℃ for 12 days of tomato seeds can be used as a rapid identify index of different cold resistance of tomato germplasm.

Key words: Tomato, Suboptimal temperature, Cold resistance, Correlation

中图分类号: 

• S54