Diurnal response of effective quantum yield of PSII photochemistry to irradiance as an indicator of photosynthetic acclimation to stressed environments revealed in a xerophytic species
Diurnal response of effective quantum yield of PSII photochemistry to irradiance as an indicator of photosynthetic acclimation to stressed environments revealed in a xerophytic species
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PSII光化学有效量子产率对辐照度的日响应作为旱生物种对应激环境光合适应的指标
DOI：
10.1016/j.ecolind.2016.11.027
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发表时间：
2017
影响因子：
6.9
通讯作者：
Peltola Heli
中科院分区：
文献类型：
--
作者：
Zha Tian-Shan;Wu Ya Juan;Jia Xin;Zhang Ming Yan;Bai Yu Jie;Liu Peng;Ma Jing Yong;Bourque Charles Paul-Andre;Peltola Heli
利用叶绿素荧光（ChlF）技术原位监测植物对胁迫的响应越来越受到关注，但由于缺乏稳定的日间指标，限制了该方法的应用。光系统II（PSII）光化学有效量子产额（Φ PSII）对光合有效辐射（PAR）的日响应的季节变化被认为反映了植物在变化环境中生理状态的变化。通过对油蒿（Artemisia ordosica）PSII叶绿素（ChlF）的连续季节监测，研究了PSII对PAR的昼夜响应及其与环境因子的关系。采用Durako（2012）修改的昼夜回归方法分析响应数据。Φ PSIIforA.鄂尔多斯的光合速率主要受PAR控制，随PAR的增加而降低。日变化的响应速率（斜率）随环境因子的季节变化而降低，特别是日平均气温（Ta）和水汽压亏缺（VPD）的升高，随土壤含水量（SWC）的增加而升高。在生长季内，PSII-PAR日变化的y截距与PSII光化学最大量子产额（Fv/Fm）呈线性相关，并随SWC的增加而增加。我们的研究结果证实了Durako（2012）的建议，即日变化的PPSII-PAR关系的y截距可以作为一个很好的代表，用于用ChlF技术非侵入性监测植物的生理状态。
Monitoring responses of plants to stressesin situusing the chlorophyll-fluorescence (ChlF) technique has been of growing interest, but challenged by lack of stable daytime indicators, limiting the method’s application. Seasonal changes in diurnal responses of effective quantum yield of photosystem II (PSII) photochemistry (ΦPSII) to photosynthetically active radiation (PAR) have been assumed to reflect changes in physiological status of plants in changing environments. We examined the responses of diurnal ΦPSIIto PAR in relation to environmental factors through continuous season-long monitoring of ChlF of PSII in a desert shrub species,Artemisia ordosica. Response data were analysed with a modification of the diurnal regression method by Durako (2012). Diurnal variation in ΦPSIIforA. ordosicawas largely controlled by PAR, decreasing with increasing PAR. The rates of the response of diurnal ФPSIIto PAR (slopes) were down-regulated by seasonal changes in environmental factors, in particular, high values for daily mean air temperature (Ta) and vapor pressure deficit (VPD), and up-regulated with increases in soil water content (SWC). The y-intercepts of diurnal ФPSII-PAR regressions were linearly related to maximal quantum yield of PSII photochemistry (Fv/Fm) during the growing season, increasing with increasing SWC. Our results confirm the suggestion by Durako (2012) that the y-intercept of diurnal ФPSII-PAR relationship serves as a good proxy forFv/Fmin non-invasive monitoring of the physiological status of plants with the ChlF technique.