干旱区生态环境知识资源中心(Arid): 油蒿(Artemisia ordosica)光系统II光化学效率对去除降雨的响应

Arid

	油蒿(Artemisia ordosica)光系统II光化学效率对去除降雨的响应
其他题名	PSII Photochemical Efficiency of Artemisia ordosica in Response to Rainfall Exclusion
	张明艳; 贾昕; 查天山; 秦树高; 吴雅娟; 任才
来源期刊	中国沙漠
ISSN	1000-694X
出版年	2017
卷号	37 期号:3 页码:475-482
中文摘要	认识植物生理特征对极端干旱的响应有助于理解和预测气候变化对生态系统过程的影响。通过对叶绿素荧光连续监测,研究了油蒿(Artemisia ordosica)光系统II(PSII)最大光化学效率(F_v /F_m) 、实际光化学效率(Phi_(PSII))和非光化学淬灭(NPQ)对去除降雨的响应,旨在探讨干旱环境下PSII的光保护机制。结果表明: 油蒿叶片Phi_(PSII)和NPQ受光合有效辐射影响呈现出明显的日变化。与对照相比,去除降雨条件下Phi_(PSII)降低、NPQ升高。去除降雨降低了Phi_(PSII)对环境因子的敏感性,提高了NPQ对环境因子的敏感性。去除降雨条件下F_v /F_m的降低是由于PSII反应中心的可逆性失活。这些结果表明极端干旱影响油蒿PSII光化学效率; 油蒿通过增加非辐射热耗散来抵抗干旱胁迫。
英文摘要	Understanding the adaptive strategy of psammophyte plants under drought stress has drawn much research attention. Artemisia ordosica is among the most important sand-fixing species in the Mu Us Sandland. We conducted continuous in situ measurements of chlorophyll fluorescence on A. ordosica under both rainfall exclusion and natural precipitation conditions to examine the response of PSII photochemical efficiency to water stress. Continuous measurements of the chlorophyll fluorescence parameters were made in August, 2013 at the Yanchi Research Station, Ningxia Hui Autonomous Region, northwest China. Chlorophyll fluorescence parameters were measured on Artemisia ordosica under both rainfall exclusion and natural precipitation conditions using a Monitoring-Pam fluorometer. Climatic variables were simultaneously measured with automated sensors. The maximum quantum yield of PSII photochemistry (F_v /F_m), photochemical efficiency (Phi_(PSII)) and non-photochemical quenching (NPQ) were analyzed in relation to environmental factors at the hour and diel scales. Photosynthetically active radiation was the direct control over Phi_(PSII) and NPQ at the diel scales. Phi_(PSII) and NPQ were significantly different in different water cinditions. The sensitivity of Phi_(PSII) to incident photosynthetically active radiation, air temperature and relative humidity was lower under rainfall exclusion than under natural rainfall, while the sensitivity of NPQ to these factors was increased by rainfall exclusion. The decrease of F_v /F_m was by the reversible inactivation of PSII reaction center. Our results indicated that drought stress strongly affects the dynamics of chlorophyll fluorescence parameters of Artemisia ordosica, which copes with harsh desert environments by adaptively increasing its thermal dissipation to avoid damages to the photosynthetic apparatus.
中文关键词	叶绿素荧光 ; 降雨 ; PSII光化学效率 ; 干旱半干旱区
英文关键词	chlorophyll fluorescence rainfall PSII photochemical efficiency arid and semiarid area
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:5988938
来源机构	北京林业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/237098
作者单位	北京林业大学水土保持学院, 宁夏盐池毛乌素沙地生态系统国家定位观测研究站;;水土保持国家林业局重点实验室, 北京 100083, 中国
推荐引用方式 GB/T 7714	张明艳,贾昕,查天山,等. 油蒿(Artemisia ordosica)光系统II光化学效率对去除降雨的响应[J]. 北京林业大学,2017,37(3):475-482.
APA	张明艳,贾昕,查天山,秦树高,吴雅娟,&任才.(2017).油蒿(Artemisia ordosica)光系统II光化学效率对去除降雨的响应.中国沙漠,37(3),475-482.
MLA	张明艳,et al."油蒿(Artemisia ordosica)光系统II光化学效率对去除降雨的响应".中国沙漠 37.3(2017):475-482.