Effects of Different Light Intensities on the Growth and Photosynthesis of Symplocos tetragona Seedlings

doi:10.7525/j.issn.1673-5102.2017.04.011

Abstract

Abstract: By measuring the effects of different shading on seedling morphology of Symplocos tetragona, we studied the response and adaptation mechanism of the growth and photosynthetic characteristics of S.tetragona to changes of light intensity in growth environment. The biomass of S.tetragona seedlings was sensitive to light intensity distribution, under light processing, the ratio of leaf area decreased, the total leaf area decreased. Under weak light treatment by increasing the leaf biomass ratio and leaf area ratio, the biomass ratio was support, and the light harvesting capacity was improved. However, total biomass accumulation under L100, L30, and L10 treatments was significantly less than that under L50 treatment, and total leaf area under L30, L50, L100 light intensity treatments was significantly higher than that under L10. The growth intensity significantly affected photosynthetic physiological parameters and photosynthetic pigment content of S.tetragona. At 10% and 100% light intensity, leaf maximum net photosynthetic rate(P_max), apparent quantum efficiency(AQY) and light saturation point(LSP) of S.tetragona were significantly lower than the condition of 30% and 50% light intensity, and the light compensation point(LCP) increased with the increase of light intensity. The total chlorophyll and carotenoid in 10% 100% were decreased significantly with the increase of light intensity(P<0.05). Too strong or too weak light environment has a negative impact on the growth of S.tetragona, of which 50% is the best light intensity for seedling growth of S.tetragona. S.tetragona is a neutral species, whose seedlings is suitable for slightly hidden conditions.

Key words: Symplocos tetragona, light intensity, growth dynamic, biomass allocation, photosynthetic characteristics

CLC Number:

Q949.775.4

SHU Wen-Jiang, CHAI Sheng-Feng, LI Zhao-Hai, FAN Jin-Shun, TANG Jian-Min, ZHU Shu-Fang, HE Zhi-Hong. Effects of Different Light Intensities on the Growth and Photosynthesis of Symplocos tetragona Seedlings[J]. Bulletin of Botanical Research, 2017, 37(4): 556-562.

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