植物生态学报 ›› 2021, Vol. 45 ›› Issue (8): 870-879.DOI: 10.17521/cjpe.2021.0146

所属专题: 光合作用

• 研究论文 • 上一篇    下一篇

黑沙蒿光合能量分配组分在生长季的相对变化与调控机制

靳川1,2, 李鑫豪1,2, 蒋燕1,2, 徐铭泽1,2, 田赟1,2, 刘鹏1,2, 贾昕1,2,3, 查天山1,2,3,*()   

  1. 1北京林业大学水土保持学院, 北京 100083
    2宁夏盐池毛乌素沙地生态系统国家定位观测研究站, 北京 100083
    3北京林业大学水土保持国家林业局重点实验室, 北京 100083
  • 收稿日期:2021-04-19 修回日期:2021-06-26 出版日期:2021-08-20 发布日期:2021-07-22
  • 通讯作者: 查天山
  • 作者简介:* tianshanzha@bjfu.edu.cn
  • 基金资助:
    国家自然科学基金(32071842);国家自然科学基金(31901366);国家自然科学基金(32071843);中央高校基本科研业务费专项资金(2015ZCQ-SB-02)

Relative changes and regulation of photosynthetic energy partitioning components in Artemisia ordosica during growing season

JIN Chuan1,2, LI Xin-Hao1,2, JIANG Yan1,2, XU Ming-Ze1,2, TIAN Yun1,2, LIU Peng1,2, JIA Xin1,2,3, ZHA Tian- Shan1,2,3,*()   

  1. 1School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
    2Yanchi Ecology Research Station of Mau US Desert, Beijing 100083, China
    3Key Laboratory of State Forestry Administration on Soil and Water Conservation, Beijing Forestry University, Beijing 100083, China
  • Received:2021-04-19 Revised:2021-06-26 Online:2021-08-20 Published:2021-07-22
  • Contact: ZHA Tian- Shan
  • Supported by:
    National Natural Science Foundation of China(32071842);National Natural Science Foundation of China(31901366);National Natural Science Foundation of China(32071843);Fundamental Research Funds for the Central Universities(2015ZCQ-SB-02)

摘要:

为了探明典型荒漠灌木优势物种黑沙蒿(俗名油蒿, Artemisia ordosica)光合过程能量中分配对环境波动的相对变化及其长期调节机制, 该研究于2018年4-10月在宁夏盐池毛乌素沙地, 同时使用MONITORING-PAM多通道荧光监测仪和LI-6400XT便携式光合测量仪对黑沙蒿叶片的最小荧光产量(Fo)、最大荧光产量(Fm)、稳态荧光产量(Fs)、光下最大荧光产量(Fm′)、净光合速率(Pn)、暗呼吸速率(Rd)、蒸腾速率(E)和叶片气孔导度(gs)进行现场测定, 在实验室内计算比叶面积(SLA)、单位面积氮含量(Narea)、叶绿素含量(CChl)和叶绿素a/b (Chl a/b), 分析黑沙蒿光合过程能量分配中固碳耗能占比(ΦA)、光呼吸耗能占比(ΦPR)、调节性热耗散耗能占比(ΦNPQ)和非调节性热耗散耗能占比(ΦNO)与环境参数和叶性状参数之间的关系以及能量分配各组分之间的相对变化。结果表明, 光化学反应组分(ΦAΦPR)和热耗散组分(ΦNPQΦNO)之间呈负相关竞争关系, 两组分内部呈正相关协同关系, EΦAΦPR正相关, 和ΦNPQΦNO负相关。在低土壤含水量(SWC)和高饱和水汽压差(VPD)环境条件下, 黑沙蒿ΦAΦPRSLA显著降低, ΦNPQΦNO显著增加。研究认为, 在长期干旱或高蒸散条件下, 黑沙蒿通过降低SLA等途径避免水分的过度流失, 同时将部分过剩光能由光呼吸代谢途径转移到热耗散组分进行耗散。波动环境下黑沙蒿形态性状的变异和光合过程能量分配的长期调节机制, 反映了其利用形态与生理的协同可塑性对逆境的适应。

关键词: 荒漠植物, 光合作用, 能量分配, 光呼吸, 热耗散

Abstract:

Aims This study is to examine the relative changes and regulation in photosynthetic energy partitioning components of a typical desert shrub Artemisia ordosica in Northwest China.
Methods The minimum fluorescence yield (Fo), maximal fluorescence yield (Fm), actual fluorescence yield (Fs), maximal fluorescence yield in the light-adapted state (Fm′), net photosynthetic rate (Pn), dark respiration (Rd), transpiration rate (E) and stomatal conductance (gs) of A. ordosica were investigated from April to October, 2018 using a multi-channel fluorometer and a portable photosynthesis analyzer. The specific leaf area (SLA), nitrogen per leaf area (Narea), chlorophyll content (CChl) and the ratio of chlorophyll a to chlorophyll b content (Chl a/b) were also measured. We analyzed the fraction of energy used for CO2 assimilation (ΦA), the fraction of energy used for photorespiration (ΦPR), the fraction of regulate heat dissipation (ΦNPQ) and the fraction of non-regulate heat dissipation in energy allocation (ΦNO) during the photosynthetic process in A. ordosica and their responses to fluctuating environment.
Important findings The photochemical reaction component (ΦA and ΦPR) and the heat dissipation component (ΦNPQ and ΦNO) showed a negative competition relationship, and exhibited positive synergistic relationship within components. E was positively correlated with ΦA and ΦPR, and negatively correlated with ΦNPQ and ΦNO. Under low soil water content (SWC) and high saturated water vapor pressure (VPD) conditions, ΦA, ΦPR and SLA were significantly decreased, while ΦNPQ and ΦNO were significantly increased. The results indicate that A. ordosica avoids excessive loss of water under the condition of the long drought or high evapotranspiration via reducing SLA. Synergistically, excessive light energy is transferred from photorespiration to thermal dissipation pathway. The relative changes and long-term regulation of photosynthetic energy partitioning in A. ordosica under fluctuating environment, fully reflect the acclimation of plants to adversity via its synergistic morphologic and physiological plasticity.

Key words: desert plant, photosynthesis, energy partitioning, photorespiration, heat dissipation