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| Effect of Solar-Shading Screen with Different Colors and Densities on Growth and Photosynthetic Characteristics of Over-Summer Pepper Seedlings |
| TIAN Di，WANG Junwei，DENG Wentao，WU Qiuyun，HUANG Ke* |
| College of Horticulture，Hunan Agricultural University，Engineering Research Center for Horticultural Crop Germplasm Creation and New Variety Breeding，Ministry of Education，Key Laboratory for Vegetable Biology of Hunan Province， Changsha 410128，Hunan，China |
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Abstract High temperature hot summer with heavy rain and strong sunlight had seriously affected the culture of pepper seedlings．In order to explore the effect of solar-shading screen with different colors and densities on growth of over-summer pepper seedling，this study took pepper varieties of ‘Ruanpi No.15’ as test material；covered seedlings with 5 different specifications solar-shading screens，including green 3， black 3，green 6，black 6，blue 6；and took no solar-shading screen cover as the contrast（CK）．The results showed that the plant height，aerial parts fresh weight of pepper seedlings，and chlorophyll and carotenoid contents， minimal（Fo）and maximal（Fm）fluorescence，maximal photochemical efficiency（Fv/Fm），and photochemical quenching（qP）in pepper seedling leaves treated with black 3 were all significantly higher than those of the contrast．The leaves growth of over-summer pepper seedlings，transportation and accumulation of assimilat products to vegetative organs，photosynthetic pigments contents，and openness of PS Ⅱ reaction center were improved；integrity of photosynthetic system membrane，smooth transmission of photosynthetic electrons were protected．Considering these indicators，we believed covering solar-shading screens of black 3 was beneficial to pepper seedlings culture over-summer．It is worthwhile to recommend to production．
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Received: 25 January 2021
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