Chinese Bulletin of Botany ›› 2013, Vol. 48 ›› Issue (6): 635-642.DOI: 10.3724/SP.J.1259.2013.00635

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Chloroplast Ultrastructure and Emission Fluorescence Spectrum Characteristics for Stems of Phyllostachys pubescens

Dengju Chen1, Peijun Gao1, Xingbo Wu1, Yan Gao1, Guosheng Wen1, Yukui Wang3, Rongfu Gao1,2, Rumin Zhang1*   

  1. 1The Nurturing Station for the State Key Laboratory of Subtropical Silviculture, Zhejiang Agriculture and Forestry University, Lin’an 311300, China;

    2College of Biological Sciences and Technology, Beijing Forestry University, Beijing 100083, China;

    3Research Center of Bamboo, State Forestry Administration, Hangzhou 310012, China
  • Received:2013-01-25 Revised:2013-04-03 Online:2013-11-01 Published:2013-12-03
  • Contact: Rumin Zhang

Abstract: To reveal the photosynthetic characteristics of stems of Phyllostachys pubescens, we used scanning electron microscopy to observe the chloroplast ultrastructure of stems and leaves and detected the changes in pigment content and emission fluorescence spectra in 1- and 3-year-old plants. The emission fluorescence spectra underwent fourthderivative analysis with Origin Pro 9.0. Chloroplasts of stems showed numerous lamella and abundant starch grains. The chlorophyll, carotenoid and chlorophyll a/b content was significantly lower in stems than leaves (P<0.05). The main peak of emission fluorescence spectrum at 735 nm in stems was absent. The semi-width ratios of PSII and PSI in 1- and 3-year-old stems were significantly reduced by 7.0% and 11.3% (P<0.05), respectively, as compared with leaves, whereas the height ratio increased by 6.5% and 18.3% (P<0.05), respectively. Fourth-derivative spectra showed 6 fluorescence peaks between 650 and 800 nm, representing LHCII, CP43, CP47, RCI, LHCI and PSII-PSI shoulder peaks, respectively. RCI and LHCI in stems showed obvious Stokes shifts as compared with the peaks in leaves. Thus, chloroplasts in stems of P. pubescens may adapt to far-red light and coordinate the allocation of excitation energy between PSII and PSI by increasing the chlorophyll b relative content and the number of lamella as well as reducing the content of LHCI.