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《Acta Agrestia Sinica》 2017-04
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Interaction Effect of Soil Drought and Strong Light on Photosynthetic Performance of Kobresia Pygmaeain Qinghai-Tibetan Plateau

SHI Sheng-bo;LI Tian-cai;WANG Wei;DE Ke-jia;XU Xian-ying;WANG Qi;MA Jian-ping;LI Ai-de;KANG Cai-zhou;Key Laboratory of Adaptation and Evolution of Plateau Biology/Key Laboratory of Crop Molecular Breeding of Qinghai Province/Northwest Institute of Plateau Biology,Chinese Academy of Sciences;Research Center of Engineer Technique for Desert Plants in Gansu/Gansu Desert Control Research Institute;Qinghai Academy of Animal Science and Veterinary Medicine/Qinghai University;  
Plant response to a single environmental factor is often modified by another factor.Kobresia pygmaea was collected from the Alpine Grassland Ecosystem Research Station in the region of Three-RiverSource.The chlorophyll fluorescence imaging of leaves was used to determine the interaction effects between soil drought and strong light besides measurement of photosynthetic pigments.The results showed that there was no difference in total chlorophyll contents(Chl a+b),and that chlorophyll acontents(Chl a)and the ratio of chlorophyll ato b(Chl a/b)decreased in soil drought treatment.The PSII maximum and operating efficiency(F_v'/F_m'and F_q'/F_m')and the PSII efficiency factor(Fq'/F_v')were significantly influenced by actinic light intensity,and the decrease of F_v'/F_m'and Fq'/F_m'were intensified by the treatment of soil drought.Non-photochemical quenching coefficient(NPQ)and relative limitation of PSII photochemical efficiency(L(PFD))increased with the enhancement of actinic light intensity,and these trends were aggravated in soil drought treatment.GLM univariate analysis indicated that light intensity was the mainfactor,and excepting Fq'/F_m'and L(PFD),the fluorescence parameters of NPQand F_v'/F_m'exhibited interaction effect among actinic light and soil drought treatments.The results demonstrated that K.pygmaea could quickly respond to environmental light variations and had a strong tolerance to soil drought stress.The improvement of dissipation of non-photochemical energy was one of the important strategies for K.pygmaeato maintain effective performance of photosynthetic apparatus in alpine environments.
【Fund】: 青海省重大科技专项“耗牛提质增效技术集成与产业化示范”(2016-NK-A7);; 国家自然科学基金项目(31660237);; 甘肃省基础研究创新群体项目(1506RJIA155);; 青海省自然科学基金面上项目(2016-ZJ-906);; 青海省创新平台建设专项项目-青海省作物分子育种重点实验室(2017-ZJ-Y14)资助
【CateGory Index】: Q945.11
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