不同茄子品种幼苗耐热性研究

以45 ℃/36 ℃（昼/夜）的温度对4个茄子品种进行胁迫处理，研究了高温胁迫对茄子的热害指数、电解质渗透率、SOD活性、MDA含量及叶绿素荧光参数的影响。结果表明，高温处理后，茄子热害指数、电解质渗透率及MDA含量显著上升，耐热品种上升幅度低于不耐热品种；SOD活性显著降低，恢复2 d后耐热品种06-E417和紫妃1号的SOD活性比处理前上升了20.3 %和20.7 %，不耐热品种则没有表现这种趋势。高温胁迫后，茄子Fv/Fm、Fv/Fo、ΦPSⅡ、qP、ETR及Fv’/Fm’均显著降低，耐热品种降低的幅度低于不耐热品种，表明在高温胁迫后耐热品种具有较高的光系统Ⅱ活性。

Studies on Seedling Heat Tolerance of Different Eggplant(Solanum melongena L)Varieties

This paper studied the effects of high temperature stress(45 ℃/36 ℃,day/night)on 4 eggplant(Solanum melongena L.)varieties and the heat injury index,electrolytic leakage,SOD activity,MDA content and the influence exerted by chlorophyll fluorescence of high temperature stress on these varieties.The results showed that heat injury index,electrolytic leakage rate and MDA content in eggplant seedlings increased significantly after high temperature treatment.The rising rate of heat tolerant varieties was lower than those sensitive cultivars.The SOD activity decreased significantly.After 2 days recovery,the SOD activity of heat tolerant eggplants‘06-E417’and‘Zifei No.1’increased by 20.3 % and 20.7 %,respectively than pre treatment,while those of heat sensitive eggplants nearly remained the same.High temperature stress also decreased Fv/Fm，Fv/Fo，ΦPSⅡ，qP，ETR and Fv’/Fm’in eggplant significantly.But the decreasing rate of heat tolerant cultivars is lower than those of heat sensitive cultivars.This indicates that under high temperature stress,the heat tolerant varieties possess higher activity of PSⅡ.