高温胁迫下黄瓜幼苗的某些光合特性和PSⅡ光化学活性的变化  

Changes of Some Photosynthetic Properties and Photosystem Ⅱ Photochemical Activities in Cucumber Seedlings under High Temperature Stress

作　　者：李建建[1,2] 常雅君[3] 郁继华[2] 

机构地区：[1]红河学院农学系 [2]甘肃农业大学园艺系,兰州730070 [3]兰州大学生命科学学院

出　　处：《植物生理学通讯》2007年第6期1085-1088,共4页Plant Physiology Communications

基　　金：甘肃省自然科学基金(3ZS061-A35-075);红河学院博硕项目(XSS06019)

摘　　要：以三叶一心期的黄瓜品种‘津春4号’(耐热)为试材,研究其在高温(处理I35℃/20℃、II42℃/27℃,光照强度350μmol·m^(-2)·s^(-1))胁迫1、3、5 d及恢复2d后的某些光合特性和PSⅡ光化学活性。变化的结果表明:高温胁迫下黄瓜幼苗的净光合速率(P_n)、气孔导度(G_s)显著下降;叶绿素荧光参数,F_v/F_m、Φ_(psⅡ)与q_p均下降,而NPQ上升;恢复2d后35℃/ 20℃下的各项指标均有所恢复,但仍不能恢复到未作高温处理的水平,而42℃/27℃下的各项指标比恢复前更严重。Changes of some photosynthetic properties and photosystem Ⅱ photochemical activities in cucumber （Cucumis sativus） seedlings were tested under high temperature stress （treat Ⅰ： 35 ℃ in daytime/20 ℃ in night; Ⅱ： 42 ℃/27 ℃; with a light intensity of 350μmol·m^-2·s^-1） for 1, 3 and 5 d and recovery for 2 d. The results showed that the net photosynthetic rate （Pn） and stomatal conductance （Gs） decreased significantly after the treatment. Chlorophyll fluorescence parameters such as Fv/Fm, ФPSⅡ and qp decreased significantly, while NPQ increased. Except that all indexes under 35 ℃/20 ℃ treatment could recover to some extent after the plants had been recovered for 2 d, but could not recovered to the level of untrearment. And all indexes under 42 ℃/27 ℃ treatment were more serious as compared with before recovery.

关 键 词：高温胁迫 黄瓜幼苗 光合作用 叶绿素荧光 

分 类 号：S642.2[农业科学—蔬菜学] Q945[农业科学—园艺学]