干旱区研究

干旱区研究 >

2010 , Vol. 27 >Issue 5: 738 - 744

DOI: https://doi.org/10.13866/j.azr.2010.05.003

植物生理

白榆(Ulmus pumila L.)光驯化后的快速光曲线变化特征

  • 韩炜 ,
  • 徐新文 ,
  • 李利 ,
  • 李生宇 ,
  • 罗玉新 ,
  • 周艺 ,
  • 郭灵丽
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  • 1.中国科学院 新疆生态与地理研究所, 新疆 乌鲁木齐 830011
    2.中国科学院 研究生院, 北京 100039
    3.中国石油天然气股份有限公司 塔里木油田分公司, 新疆 库尔勒 841000
韩炜(1975-), 男, 山东人, 博士生, 主要从事荒漠植物生理生态研究. E-mail: hanweiaaa@163.com
徐新文. E-mail: sms@ms.xjb.ac.cn

收稿日期: 2009-11-26

  修回日期: 2010-04-01

  网络出版日期: 2026-01-09

基金资助

中国科学院西部行动计划项目(KZCX2-XB2-13);新疆维吾尔自治区重大科技专项(200733144-3);国家自然科学基金项目(40701098);国家自然科学基金项目(40901137)

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Variation of Rapid Light Curves of Ulmus pumila Leaves after high-light and Low-light Acclimation

  • HAN Wei ,
  • XU Xin-wen ,
  • LI Li ,
  • LI Sheng-yu ,
  • LUO Yu-xin ,
  • ZHOU Yi ,
  • GUO Ling-li
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  • 1. Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China
    2. Graduate University, Chinese Academy of Sciences, Beijing 100039, China
    3. Tarim Branch, PetroChina Corporation, Korla 841000, Xinjiang, China

Received date: 2009-11-26

  Revised date: 2010-04-01

  Online published: 2026-01-09

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摘要

用饱和脉冲调幅式叶绿素荧光测定仪PAM-2100, 分别测定了驯化于强光和弱光下的白榆(Ulmus pumila L.)叶片的快速光曲线。结果表明, 驯化后的白榆叶片样品, 其光合特征值发生明显改变。① 强光驯化使得瞬时荧光Ft 值升高, 弱光驯化下非光化学淬灭系数NPQ高于强光驯化值; Ⓒ 弱光驯化后, 吸收能量的比例参数Y(II)大大减小, 主动散失能量的能力参数Y(NPQ)增加, 但是对于结构性保护能力参数Y(NO)影响不大; Ⓒ 强光驯化后的白榆叶片的最大电子传递速率rETRmax 远大于弱光驯化后的相应值, 相应的初始斜率 α 和半饱和光强Ik 也具有类似的规律。市内环境的光合有效辐射不会对白榆造成光合机构的损伤, 强光驯化更有利于白榆的光合作用;在干旱区植物中, 白榆具有较强抗性和竞争力; 市内绿化规划时, 建议将白榆种植在阳光直射处, 既可以充分发挥白榆的强光抗性, 又可以为一些阴生绿化植物减少阳光直射伤害。

关键词： 白榆(Ulmus pumila L.); 叶绿素荧光; 光驯化; 快速光曲线; 拟合; 能量; 分配策略

本文引用格式

韩炜 , 徐新文 , 李利 , 李生宇 , 罗玉新 , 周艺 , 郭灵丽 . 白榆(Ulmus pumila L.)光驯化后的快速光曲线变化特征[J]. 干旱区研究, 2010 , 27(5) : 738 -744 . DOI: 10.13866/j.azr.2010.05.003

Abstract

Rapid light curves provide the detailed information about the saturation characteristics of electron trans-port and the holistic photosynthetic performance of a plant. In this study, the rapid light curves (RLCs)were measured with PAM-2100 from the leaf samples of Ulmus pumila L. acclimating to low-light 〔80 μmol / (m2 ·s)〕 and high-light conditions〔80 μmol / (m2 ·s)〕, and the distinctive patterns of RLCs parameters were researched in terms of differential sink capacity and PSII reaction centre closure. Derived cardinal points of RLCs (α, Ik and Pm)were used to describe the photosynthetic capacity of U. pumila leaves, its light adaptation and capacity to tol-erate a short-term light change. The results are as follows: (1)High-light acclimation made the Ft value increase, and the NPQ under low-light acclimation was higher than that under the highlight acclimation; (2)Y(II)corre-sponding to the fraction of energy converted photochemically in PS II was significantly decreased, Y(NPQ)corre-sponding to the fraction of energy dissipated in form of heat via the regulated photo-protective NPQ mechanism was increased, but Y(NO)reflecting the fraction of energy passively dissipated in form of heat and fluorescence, mainly due to the closed PS II reaction centers, was kept steadily; (3)The rETRmax value was much higher after high-light acclimation than that after low-light acclimation, and that of corresponding α and Ik was similar. Measurement and fitting of RLCs can provide the information of plant PS II, on which we can know the survival ways of plants.

Key words： Ulmus pumila L; chlorophyll fluorescence; light acclimation; RLC; fitting; energy; distribution strategy

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