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植物研究 ›› 2017, Vol. 37 ›› Issue (2): 281-287.doi: 10.7525/j.issn.1673-5102.2017.02.017

• 论文 • 上一篇    下一篇

越冬期广玉兰阳生叶和阴生叶PSⅡ功能及捕光色素分子内禀特性的比较研究

胡文海1,2, 叶子飘2,3, 闫小红1,2, 杨旭升1   

  1. 1. 井冈山大学生命科学学院, 吉安 343009;
    2. 江西省生物多样性与生态工程重点实验室, 吉安 343009;
    3. 井冈山大学数理学院, 吉安 343009
  • 收稿日期:2016-10-26 出版日期:2017-03-15 发布日期:2017-03-11
  • 作者简介:胡文海(1973-),男,教授,博士,主要从事园艺植物生理生态方面的研究。
  • 基金资助:
    国家自然科学基金项目(31560069);江西省教育厅科技计划项目(GJJ12724)

PSⅡ Function and Intrinsic Characteristics of Light-harvesting Pigment Molecules for Sun- and Shading-leaf in Magnolia grandiflora During Overwintering

HU Wen-Hai1,2, YE Zi-Piao2,3, YAN Xiao-Hong1,2, YANG Xu-Sheng1   

  1. 1. School of Life Sciences, Jingganshan University, Ji'an 343009;
    2. Key Laboratory for Biodiversity Science and Ecological Engineering, Jingganshan University, Ji'an 343009;
    3. Math and Physics College, Jingganshan University, Ji'an 343009
  • Received:2016-10-26 Online:2017-03-15 Published:2017-03-11
  • Supported by:
    National Natural Science Foundation of China(31560069);Project in the Educational Commission of Jiangxi Province(GJJ12724)

摘要: 捕光色素分子的内禀特性不仅决定了光能的吸收与传递,也将影响到激发能向光化学反应、热耗散和叶绿素荧光的分配。本文采用叶绿素荧光技术和光合电子流对光响应机理模型,研究了越冬期广玉兰(Magnolia grandiflora)阳生叶和阴生叶两种不同光环境下叶片PSⅡ功能及其捕光色素分子内禀特性的差异,以探索广玉兰越冬的光保护策略。结果表明:越冬期低温导致叶片轻微光抑制的发生,全光照加剧了阳生叶光抑制程度,而弱光环境有利于阴生叶光抑制的恢复。阳生叶可通过降低叶绿素含量和捕光色素分子数量以减少对光能的吸收,并且具有较强的光化学和热耗散能力以保护光合机构免受低温强光伤害。而阴生叶虽然其光化学反应能力相对较弱,但具有较强的热耗散能力,可有效地保护其免受短时曝露在强光下的伤害。

关键词: 广玉兰, 越冬期, PSⅡ功能, 捕光色素分子内禀特性, 光保护策略

Abstract: Light absorption and energy transfer are determined by intrinsic characteristics of light-harvesting pigment molecules, which also have impacts on distribution of excited energy for photochemical reaction, heat dissipation and chlorophyll fluorescence. We compared the differences of the PSⅡ function and intrinsic characteristics of light-harvesting pigment molecules of sun- and shading-leaves to study the photoprotective strategies in overwintering Magnolia grandiflora. The slight photoinhibition was caused in leaves of M.grandiflora by low temperature during overwintering. Natural sunlight enhanced photoinhibition in sunleaf, however, low light condition was propitious to the recovery of photoinhibition in shading-leaf. Sun-leaf had lower chlorophyll content and the numbers of light-harvesting pigment molecules(N0) to reduce light energy absorption. Sun-leaf also possessed higher photochemical function and thermal energy dissipation in PSⅡ, which would protect photosynthetic apparatus against damage by low temperature and high light. Shading-leaf exhibited lower capability of photochemical reaction, however, possessed greater thermal energy dissipation, which would alleviate photoinhibition of shadingleaf under temporal high light condition during overwintering.

Key words: Magnolia grandiflora L., overwintering, PSⅡ function, intrinsic characteristics of light-harvesting pigment molecules, photoprotective strategies

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