We selected 4 survey plots with groundwater depths > 4 m near ecological monitoring wells in the Tarim River to investigate leaf water potential, leaf relative water content, and chlorophyll fluorescence characteristics of Populus euphratica under drought stress induced by decreased groundwater level. We analyzed the impact of drought stress on photosystem II photochemical efficiency and excited energy dissipation in terms of energy metabolism and conversion. The leaf water potential of P. euphratica significantly decreased with increasing drought stress induced by increasing groundwater depth, with no significant differences in leaf relative water content, which maintained optimal values (80.38%–86.19%). Under drought stress, synthetically photosynthetic activity and the leaf light saturation point of P. euphratica significantly decreased, and photosynthetic electron transportation rate, actual photochemical efficiency of photosystem II in the light and photochemical quenching of P. euphratica decreased with increasing photosynthetic active radiation. Greater decreases occurred with more severe drought stress. The non-photochemical quenching and the yield for dissipation by downregulation of P. euphratica under drought stress significantly increased with increasing photosynthetic active radiation, and the maximal photochemical efficiency was maintained at an optimal value (0.80–0.86). Increasing drought stress would result in significantly decreased share of photosynthetic solar energy utilization, whereas the ability to withstand high light intensity decreased, which would result in greater excess of excited energy. P. euphratica can release the stress resulting from excess excited energy by heat dissipation, which plays an important role in the process of energy metabolism on the photosystem of P. euphratica. Although the photosystem II of P. euphratica under drought stress in the lower reaches of the Tarim River has not yet been irreversibly damaged because of light inhibition, the potential crisis of light injury induced by light inhibition is increasing.
Chenggang Zhu, Yaning Chen, Weihong Li, Aihong Fu, Yuhai Yang
. Effect of Drought Stress on Photochemical Efficiency and Dissipation of Excited Energy in Photosystem II of Populus euphratica[J]. Chinese Bulletin of Botany, 2011
, 46(4)
: 413
-424
.
DOI: 10.3724/SP.J.1259.2011.00413
桂仁意, 刘亚迪, 郭小勤等 (2010). 不同剂量137Cs-γ辐射对毛竹幼苗叶片叶绿素荧光参数的影响45(1): 66 - 72.
胡学华, 蒲光兰, 肖千文等 (2007). 水分胁迫下李树叶绿素荧光动力特性研究. 中国生态农业学报15(1): 75 - 77.
焦德茂, 李霞, 黄雪清等 (2001). 转PEPC基因水稻的光合CO2同化和叶绿素荧光特性. 科学通报46( 5): 414 - 418.
兰伯斯, 庞斯等著, 张国平等译 (2005). 植物生理生态学. 浙江大学出版社.pp: 8-68.
林阿朋, 王超, 乔洪金等 (2009). 青岛海域漂浮和沉降浒苔的光合作用研究. 科学通报54(3): 294 - 298.
张守仁 (1999). 叶绿素荧光动力学参数的意义及讨论.植物学通报16 (4): 444 - 448.
Chen YN, Li WH, Chen YP, et al (2004b). Physiological response of natural plants to the change of groundwater level in the lower reaches of Tarim River, Xinjiang. Progress in natural science 14 (11): 975-983.
Chen YN, Wang Q, Li WH, et al (2006). Rational groundwater table indicated by the eco-physiological parameters of the vegetation: A case study of ecological restoration in the lower reaches of the Tarim River. Chinese Science Bulletin 51: 8-15.
Chen YN, Wang Q, Ruan X, et al (2004a). Physiological response of Populus euphratica to artificial water-recharge of the lower reaches of Tarim River. Acta botani sinica 46 (12): 1393-1401.
Chen YN，Zhang XL，Zhu XM，Li WH (2004c)，Zhang YM, et al. Analysis on the ecological benefits of the stream water conveyance to the dried-up river of the lower reaches of Tarim River，China. Science in China 47 (11): 1053-1064.
Chen YP, Chen YN, Li WH, et al (2006). Characterization of photosynthesis of Populus erphratica grown in the arid region. Photosynthetica 44 (4): 622-626.
Dusan Lazar (1999). Chlorophyll a fluorescence induction. Biochimica et Biophysica Acta 1412(3):1-28.
Efeoglu B, Ekmekci Y, Cicek N (2009). Physiological responses of three maize cultivars to drought stress and recovery. South African Journal of Botany 75: 34-42.
Flexas J, Escalona JM, Medrano H (1999). Water stress induces different levels of photosynthesis and electron transport rate regulation in grapevines. Plant Cell Environ. 22:39–48.
Fu AH, Chen YN, Li WH (2006). Analysis on water potential of Populus euphratica oliv and its meaning in the lower reaches of Tarim River, Xinjiang. Chinese Science Bulletin 51 (1): 1-8.
Gries D, Zeng F, Foetzki A, et al (2003). Growth and water relations of Tamarix ramosissima and Populus euphratica on Taklamakan desert dunes in relation to depth to a permanent water table. Plant, cell and environment 26: 725 - 736.
Gu RS, Liu QL, Pei D, et al (2004). Understanding saline and osmotic tolerance of Populus euphratica suspended cells. Plant cell, Tissue and Organ Culture 78: 261-265.
Guerfel Mokhtar, Baccouri Olfa, Boujnah Dalenda, et al (2009). Impacts of water stress on gas exchange, water relations, chlorophyll content and leaf structure in the two main Tunisian olive (Olea europaea L.) cultivars. Scientia Horticulturae119 (3):257-263.
Hamerlynck EP, Huxman TE (2009). Ecophysiology of two Sonoran Desert evergreen shrubs during extreme drought. Journal of Arid Environments 73: 582-585.
Huang X, Chen YN, Li WH, et al (2007). Daily variation of carbon flux in soils of Populus euphratica forests in the middle and lower reaches of the Tarim River. Progress in natural science 17 (5): 584-590.
Kramer DM, Johnson G, Kiirats O, Edwards GE (2004). New fluorescence parameters for the determination of QA redox state and excitation energy fluxes. Photosynthesis Research 79: 209-218.
Liu JZ, Chen YN, Chen YJ, et al (2005). Degradation of Populus euphratica community in the lower reaches of the Tarim River, Xinjiang, China. Journal of environmental sciences 17 (5): 740-747.
Oxborough K, Baker NR (1997). Resolving chlorophyll fluorescence images of photosynthetic efficiency into photochemical and non-photochemical components—calculation of qp and′Fv /Fm′without measuring Fo′. Photosynthesis Research 54: 135-142.
Peltzer D, Dreyer E, Polle A (2002). Temperature dependencies of anti-oxidative enzymes in two contrasting species. Plant Physiol Biochem. 40:141-50.
Remorini D, Melgar JC, Guidi L et al (2009). Interaction effects of root-zone salinity and solar irradiance on the physiology and biochemistry of Olea europaea. Environmental and Experimental Botany 65(2-3):210-219.
Ribas-Carbo M, Taylor NL, Giles L, et al (2005). Effects of water stress on respiration in soybean leaves. Plant Physiol.139: 466–473.
Siam A. M. J, Radoglou K. M, Noitsakis B (2008). Physiological and growth responses of three Mediterranean oak species to different water availability regimes. Journal of Arid Environments 72(5): 583-592.
Sofo A, Dichio B, Montanaro G et al (2009). Shade effect on photosynthesis and photo-inhibition in olive during drought and rewatering. Agricultural Water Management 96(8):1201-1206.
Tezara W, Mitchell VJ, Driscoll SD, Lawlor DW (1999). Water stress inhibits plant photosynthesis by decreasing coupling factor and ATP. Nature 1401: 914-7.
Thomas FM, Foetzki A, Arndt SK, et al (2006). Water use by perennial plants in the transition zone between river oasis and desert in NW China. Basic and applied ecology 7: 253-267.
Wang Q, Ruan X., Chen YN, et al (2007). Eco-physiological response of Populus euphratica Oliv. to water release of the lower reaches of the Tarim River, China. Environ Geol 53: 349-357.
Zhuang L, Chen YN (2006). Physiological Responses of Three Contrasting Plant Species to Groundwater Level Changes in an Arid Environment. Journal of Integrative Plant Biology 48 (5): 520-526.
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