Abstract:【Objective】Passion fruit is native in South America, because of its unique aroma and flavor, passion fruit is favored in the domestic fruit market in recent years, but Guizhou and other provinces that cultivate passion fruit mainly using open field cultivation, and open field cultivation is susceptible to environmental conditions, so the yield and quality performance of passion fruit is not stable, affected the economic benefits of passion fruit seriously. As the auxiliary measures of cultivation, rain shelter and light supplement can effectively improve the yield or quality of many vegetables and fruits, in order to find the methods which can stabilize performance of passion fruit, in this study, we conducted the rain shelter cultivation and light supplement cultivation, discusses the rain shelter and light supplement on the influence of the yield and fruit quality of passion fruit,and find the possible causes of the results, in order to provide reference for efficient cultivation of passion fruit.【Methods】The test material is sweet passion fruit, setting Rain Shelter (RS), Light Supplement (L), Rain Shelter + Light Supplement (RSL) and open field cultivation control group (CK). The measurement indexes include: branch length, internode length and thickness, fruit longitudinal diameter and transverse diameter, colour-changed period, average fruits number and weight of individual, yield, intrinsic quality of the fruit (titratable acid, total sugar, total free amino acids, vitamin C, total phenols, total flavonoids and β-carotene), content of chlorophyll-a and chlorophyll-b, photosynthetic properties (net photosynthetic rate, transpiration rate, stomatal conductivity and intercellular CO2 concentration). 【Results】In contrast to control group CK, Light Supplement (L): no significant effect on the branch length and internode length, can significantly increase the internode thickness by 4%, no significant effect on the fruit longitudinal diameter and transverse diameter, accelerated the fruit color change by 3d (5%), no significant effect on the yield, increase of the titratable acid by 3%, increase of the total sugar by 2%, the total free amino acids was significantly increased by 12%, the vitamin C was significantly increased by 9% , the total phenols was significantly increased by 13%, the total flavonoids was significantly increased by 38%, the β-carotene was significantly increased by 19%, the chlorophyll-a content was significantly increased by 11%, no significant effect on the chlorophyll-b content, the net photosynthetic rate was significantly increased by 20%, the transpiration rate was significantly increased by 8%, the stomatal conductance was significantly increased by 19%, no significant effect on the intercellular CO2 concentration. Rain Shelter (RS): the branch length was significantly increased by 19%, the internode length was significantly increased by 26%, the internode thickness was significantly decreased by 20%, no significant effect on the fruit longitudinal diameter and transverse diameter, delayed the fruit color change by 8d (14%), yield was significantly increased by 20%, the titratable acid was significantly decreased by 14%, the total sugar was significantly decreased by 11%, the total free amino acids was significantly decreased by 7%, the vitamin C was significantly decreased by 6% , the total phenols was significantly decreased by 64%, the total flavonoids was significantly decreased by 43%, the β-carotene was significantly decreased by 37%, the chlorophyll-a content was significantly increased by 10%, the chlorophyll-b content was significantly increased by by 37%, the net photosynthetic rate was significantly decreased by 50%, the transpiration rate was significantly decreased by 62%, the stomatal conductance was significantly decreased by 55%, the intercellular CO2 concentration was significantly decreased by 7%. Rain Shelter + Light Supplement (RSL): the branch length was significantly increased by 19%, internode length was significantly increased by 7%, the internode thickness was significantly decreased by 6%, no significant effect on the fruit longitudinal diameter and transverse diameter, delayed the fruit color change by 4d (7%), yield was significantly increased by 23%, the titratable acid was significantly decreased by 8%, the total sugar was significantly decreased by 10%, the total free amino acids was significantly decreased by 6%, the vitamin C was significantly decreased by 4%, the total phenols was significantly decreased by 50%, the total flavonoid was significantly decreased by 37%, the β-carotene was significantly decreased by 25%, the chlorophyll-a content was significantly increased by 19%, the chlorophyll-b content was significantly increased by 40%, the net photosynthetic rate was significantly decreased by 37%, the transpiration rate was significantly decreased by 46%, the stomatal conductance was significantly decreased by 51%, no significant effect on the intercellular CO2 concentration. 【Conclusion】Light Supplement (L) can significantly improve the photosynthetic characteristics of plants, increase the nutrient content of fruit, and accelerate the time of fruit color change, but cannot effectively increase the yield. Rain Shelter (RS) and Rain Shelter + Light Supplement (RSL) can significantly increase the yield, but it will lead to the decline of the plant photosynthesis characteristics and the fruit intrinsic quality, and delay the time of fruit color change. All indicators of RSL are better than RS, indicating that light supplement can compensate for the influence of insufficient light, but the effect of light source in this test is less than that of natural light. Rain shelter and light supplement can be used according to the actual requirements.
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