Effects of Shading on Physocarpus amurensis Seedlings Photosynthetic Ability and Carbohydrate Accumulation

doi:10.7525/j.issn.1673-5102.2017.06.006

Abstract

Abstract: For studying the adaptability of Physocarpus amurensis seedlings under different shading environment, we measured the photosynthesis characteristics, photosynthetic pigment content, non-structural carbohydrate(NSC) accumulation of one-year seedlings through three intensities of artificial shading(control(full light, CK), moderate shading(60% of full light, L1) and heavy shading(20% of full light, L2)). P.amurensis was heliophilous trees, and was very sensitive to changes of the light environment. The shading resulted in significant decrease in the apparent quantum efficiency(AQY), maximum net photosynthetic rate(P_max), dark respiration rate(R_d), light compensation point(LCP), light saturation point(LSP) and carotenoid content(Car)(P<0.05), and significant increase chlorophyll a(Chla), chlorophyll b(Chlb), total chlorophyll(Chl) content and chlorophyll/carotenoid(P<0.05). The shading had resulted in significant decrease in the NSC content of root, stem and leaf(P<0.05), especially L2, decreased by 52.5%, 44.9% and 43.9%, respectively, compared to CK. Thus, the ability of adaptation and regulation of P.amurensis seedling to shading environment was inferior, and it should be planted in a sunny environment in practice.

Key words: Physocarpus amurensis, shade, photosynthetic characteristics, photosynthetic pigments, non-structural carbohydrate (NSC)

CLC Number:

Q949.751.8

YIN Dong-Sheng, SHEN Hai-Long, WEI Xiao-Hui. Effects of Shading on Physocarpus amurensis Seedlings Photosynthetic Ability and Carbohydrate Accumulation[J]. Bulletin of Botanical Research, 2017, 37(6): 841-847.

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