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
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．
田地，王军伟，邓文韬，吴秋云，黄科. 不同颜色和密度的遮阳网对越夏辣椒幼苗生长及光合特性的影响[J]. 中国蔬菜, 2022, 1(3): 42-49.
TIAN Di，WANG Junwei，DENG Wentao，WU Qiuyun，HUANG Ke. Effect of Solar-Shading Screen with Different Colors and Densities on Growth and Photosynthetic Characteristics of Over-Summer Pepper Seedlings. China Vegetables, 2022, 1(3): 42-49.