番茄白粉病对番茄叶片光合特性的影响

Effects of Tomato Powdery Mildew on Photosynthetic Characteristics of Tomato Leaves

[目的]为探明番茄白粉病的致病机理,研究番茄白粉病对番茄光合特性的影响。[方法]人工接种番茄白粉菌于4种番茄上,番茄感病后在自然光照条件下,用Li-6400便携式光合仪测定番茄叶片的净光合速率、气孔导度、蒸腾速率等参数。[结果]4个番茄品种感病后的净光合速率、气孔导度、蒸腾速率均下降,但不同品种感病后净光合速率、气孔导度、蒸腾速率下降幅度不同,其中感病较重的金洋大飓星(4号)和鑫盛一号(5号)下降幅度较大,感病较轻的改良96-8和露佳(13号)下降幅度较小。[结论]研究结果可为番茄白粉病的致病机理、防治新途径以及抗病育种研究提供理论基础。

[Objective] The paper was to explore the pathogenic mechanism of tomato powdery mildew,and to study the effects of the disease on photosynthetic characteristics of tomato.[Method] With four tomato varieties as materials,the pathogen of tomato powdery mildew was artificially inoculated.After the varieties were infected,the parameters such as net photosynthetic rate,stomatal conductance and transpiration rate of tomato leaf were measured by Li-6400 portable photosynthesis detector under natural lighting conditions.[Result] The net photosynthetic rate,stomatal conductance and transpiration rate of four tomato varieties all decreased after infection.However,the decrease extent of these parameters of four varieties was different.The parameters of Jinyangdajuxing（No.4） and Xinsheng No.1（No.5） with heavy infection decreased greatly,while the parameters of improved 98-6 and Lujia（No.13） with light infection decreased lightly.[Conclusion] The results could provide theoretical basis for the study on pathogenic mechanism,new prevention way and resistance breeding of tomato powdery mildew.