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《Chinese Journal of Applied Ecology》 2014-07
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Effects of photoperiod on photosynthesis and PSⅡperformance in peach during dormancy induction

LI Dong-mei;TAN Qiu-ping;GAO Dong-sheng;CHEN Xiu-de;LI Ling;College of Horticulture Science and Engineering,Shandong Agricultural University / State Key Laboratory of Crop Biology;  
Long-day and short-day photoperiods were set artificially,with natural condition as the control,to examine photosynthetic parameters and chlorophyll fluorescence transient kinetics of 6-year-old ‘Chunjie'peach cultivar( Prunus persica cv. Chunjie),and to investigate the effects of photoperiod on photosynthesis of the northern deciduous fruit trees. The tree advanced into the dormancy induction period under the short-day condition,and delayed under the long-day condition.In the dormancy induction period,the leaf net photosynthetic rate( Pn) and stomatal conductance( gs) decreased,and the intercellular CO2concentration( Ci) increased,suggesting that the Pndecreased because of non-stomatal limitation. Maximum quantum yield for primary photochemistry( φPo,or Fv/Fm),potential activity( Fv/Fo),probability that a trapped exciton moved an electron into the electron transport chain beyond QA-( ψo) and performance index on absorption basis( PIABS) decreased in the dormancy induction period,suggesting that the electron transport capacity of photosynthetic electron transport chain was inhibited,possibly due to the damage to downstream electron transport chain( after QA-acceptor) of PSⅡ reaction center. Long-day photoperiod improved Pnin the dormancy induction period,and reduced the range of decline in PIABSand the injured degree of photosystem. Short-day photoperiod deepened and accelerated the damage to photosynthetic apparatus significantly. The induced effect of photoperiod was associated with the dormancy processes.
【Fund】: 国家自然科学基金项目(31372050);; 山东省优秀中青年科学家科研奖励基金项目(BS2011NY011)资助
【CateGory Index】: S662.1
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