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Bulletin of Botanical Research ›› 2017, Vol. 37 ›› Issue (6): 841-847.doi: 10.7525/j.issn.1673-5102.2017.06.006

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

YIN Dong-Sheng1,2, SHEN Hai-Long1, WEI Xiao-Hui3   

  1. 1. School of Forestry, Northeast Forestry University, Harbin 150040;
    2. Forestry Research Institute of Heilongjiang Province, Harbin 150081;
    3. School of Marxism, Northeast Forestry University, Harbin 150040
  • Received:2017-03-29 Online:2017-11-15 Published:2017-11-25
  • Supported by:
    The Natural Science Foundation of Heilongjiang Province(C201341)

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(Pmax), dark respiration rate(Rd), 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)

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