Effect of temperature and light to tomato photosynthesis and quality in greenhouse.

【Objective】 By heating,ventilating and supplementary lighting in the greenhouse,we studied the evolution of photosynthetic characteristics and quality of tomato,then provided theoritical evidence for precision management of tomato in greenhouse in the northwestern areas,as well as the improvement of the photosynthetic effects and economic benefits.【Method】 Using Jinpeng One as material,effect of different temperature and light conditions on chlorophyll a,chlorophyll b,and chlorophyll a/b changes and quality of the tomatoes'functional leaves cultivated in the greenhouse was studied.【Result】 Under the same temperature,as the light intensity increased,the tomatoes'photosynthetic rate increased,but decreased when the temperature exceeded 30 ℃.The value of chlorophyll a/b,vitamin C,as well as soluble sugar content increased,while chlorophyll a,chlorophyll b,and organic acid decreased with the incrense of light intensity.Under the same light intensity,with the increase in temperature,photosynthetic rate increased,and reached its highest level,but beyond 30 ℃,photosynthetic rate decreased.With the increase of temperature and light intensity,the stomatal conductance and transpiration rate of tomato leaf increased,while the concentration of CO2 decreased,but with no significant difference between each treatment;chlorophyll a and chlorophyll b increased,while chlorophyll a/b value and the sugar acid ratio decreased.【Conclusion】 Under the same temperature,the more intense light the intensity is,the better the photosynthesis and quality are.The average temperature and light conditions of early spring tomato in the northwestern district are 26.6 ℃ and 395 μmol/(m2·s).