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The effects of shading on photosynthetic characteristics and growth of Dendrocalamopsis oldhami seedlings in container.

DU Lan1, XIE Jin-zhong1*, LAI Qiu-xiang2, CHEN Liang1, ZHANG Wei1, CHEN Sheng1, XIA Jie1, WU Wei2   

  1. (1Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Fuyang 311400, Zhejiang, China; 2Nursery Center of Yongan Forestry (Group) Incorporated Company, Yongan 366000, Fujian, China).
  • Online:2019-01-10 Published:2019-01-10

Abstract: Dendrocalamopsis oldhami is an important bamboo species for afforestation in south subtropical China, with a broad application prospect in culm and shoot production. In this study, photosynthetic capacity, chlorophyll fluorescence parameters, and growth characteristics of D. oldhamiwere investigated under three shading treatments: no shading as control (full illumination, L0), singlelayer shading (70% of full illumination, L1), and two-layer shading (30% of full illumination, L2). We found that treatment L1 increased the apparent quantum efficiency and net photosynthetic rate of D. oldhami leaves, while treatment L2 had the lower values, with significant difference among the three treatments (P<0.05). The dark respiration rate (Rd), light compensation point (LCP), and light saturation point (LSP) declined with decreasing light levels. For the chlorophyll fluorescence parameters, shading significantly increased PSⅡ primary energy conversion efficiency (Fv/Fm), PSⅡ potential activity (Fv/Fo) and electron transport rate (ETR), and decreased photochemical efficiency of PSⅡ (Fv′/Fm′), photochemical quenching (qP) and nonphotochemical quenching (NPQ). Moreover, shading significantly increasedleaf chlorophyll content (Chla+Chlb) and Chla/Chlb ratio, with a significant difference between treatments L0 and L2 (P<0.05). Shading enhanced the growth performance of D. oldhami, with greatest basal diameter in treatment L1. Leaf area increased with the increases of shading levels. There was no effect of shading on plant height (P>0.05). Thus, D. oldhami has a strong adaptability to weak shading environment and an adjustable inherent mechanism to utilize low intensity light. However, low light intensity would restrict the growth ofD. oldhami container seedlings.

Key words: layered black phosphorus, methyl orange, hydroxyl radical, UV photocatalysis