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当前位置: 首页 > 文章 > 亚低温与干旱胁迫对番茄叶片光合及荧光动力学特性的影响 应用生态学报 2015,26 (6) 1687-1694
Position: Home > Articles > Effects of sub-low temperature and drought stress on characteristics of photosynthetic and fluorescence kinetics in tomato leaves Chinese Journal of Applied Ecology 2015,26 (6) 1687-1694

亚低温与干旱胁迫对番茄叶片光合及荧光动力学特性的影响

作  者：
杜清洁;代侃韧;李建明;刘国英;潘铜华;常毅博
单  位：
西北农林科技大学园艺学院;西安市长安区园艺工作站
关键词：
番茄;亚低温胁迫;干旱胁迫;光合特性;能量及电子流分配
摘  要：
利用人工气候室,研究了亚低温(8~15℃)和干旱胁迫(田间持水量的55%~65%)对盆栽番茄叶片光合特性、能量及电子流分配的影响.结果表明:与对照相比,亚低温胁迫下番茄叶片的光合色素含量降低,而干旱胁迫下升高.在亚低温或干旱胁迫下,番茄叶片的胞间CO2浓度、气孔导度及净光合速率均显著下降,气孔限制值升高,其共同处理下相应指标进一步降低或升高.亚低温或干旱单一胁迫提高了光呼吸速率,但共同胁迫下其光呼吸速率反而降低.无论是亚低温、干旱胁迫还是共同胁迫,均会导致初始荧光、PSⅡ原初光能转化效率和有效光量子产量下降,光系统发生损伤,并且PSⅡ激发能分配系数升高,光化学效率降低,过剩光能增加,总电子流及流向各交替电子流库的电子流减少.为耗散过剩光能,热耗散及交替电子流的比例增加.与亚低温和干旱胁迫单一处理相比,二者共同处理加剧了叶片的热耗散,但交替电子流比例没有进一步增加.
译  名：
Effects of sub-low temperature and drought stress on characteristics of photosynthetic and fluorescence kinetics in tomato leaves
作  者：
DU Qing-jie;DAI Kan-ren;LI Jian-ming;LIU Guo-ying;PAN Tong-hua;CHANG Yi-bo;College of Horticulture,Northwest A&F University;Horticultural Work Station of Chang'an District;
关键词：
tomato;;sub-low temperature;;drought;;photosynthetic characteristics;;distribution of energy and electron flow
摘  要：
By using tomato as material potted in climatic chamber,the photosynthetic characteristics and allocation of energy and electron flow were studied under sub-low temperature(8-15 ℃)and drought(55%-65% of field moisture capacity) conditions.The results showed that the photosynthetic pigment content declined under sub-low temperature stress,but increased under drought stress.Both sub-low temperature stress and drought stress significantly decreased the intercellular CO2 concentration,stomatal conductance and photosynthetic rate,and increased the stomatal limitation,which further decreased or increased under simultaneous treatment of sub-low temperature and drought stress.The photorespiration significantly increased under separate treatment of sub-low temperature and drought stress,but decreased under simultaneous treatment.The stress declined the Fo,Fv/Fmand Fv'/Fm',which showed the damage of photosystem.It increased the distribution of energy to PSⅡ and declined the photochemical efficiency,total electron flow and alternating electron flow.Thermal dissipation and the ratio of alternating electron flow were elevated to dissipate the excess energy.Compared with separate treatment of sub-low temperature and drought stress,the simultaneous treatment made thermal dissipation higher,but did not make alternating electrons flow further increase.

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