Effects of Extreme Sparse Sunlight on Photosynthesis Characteristics and Antioxidant Enzyme Activities of Tomato in Greenhouse
Zhang Jibo
Chen Chen
Li Nan
Li Hongyi
Xue Xiaoping
Abstract：The meteorological data of inside and outside greenhouse in November 2015 were selected to analyze the distribution of extreme sparse sunlight and characteristics of greenhouse microclimate.And the changes of photosynthesis characteristics,activities of antioxidant enzymes (SOD,CAT),MDA and soluble protein contents of tomato were studied in sunny,foggy and rainy (snowy) days.The results showed that sparse sunlight could be formed in severe foggy and rainy (snowy) days.The light intensity in greenhouse could be significantly reduced and the temperature declined in different degrees,especially in rainy (snowy)day.The maximum photosynthetic rate,light saturation point,apparent quantum efficiency,CAT activity and soluble protein content of tomato leaves in foggy and rainy (snowy) days were significantly lower than those in sunny day.However,the light compensation point,SOD activity and MDA content in foggy and rainy (snowy) days were significantly higher than those in sunny day.The low light intensity and temperature in greenhouse could make the oxidation resistance of super oxygen free radicals weaker,the structure and function of cell membrane system be hurt heavier,the leaves more likely to aging and the photosynthetic capacity weaker.These results could provide scientific bases for management of greenhouse vegetables and agricultural meteorological service in foggy and rainy (snowy) days in northern China.
Keywords：Sparse sunlightGreenhouseTomatoPhotosynthesis characteristicsEnzyme activities
Publication Date：2017-01-01
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：5( 64-68 )