遮荫对‘保佳红’桃树叶片快速叶绿素荧光诱导动力学曲线的影响  

Effects of Shading on Fast Chlorophyll Fluorescence Induction Dynamics of 'Baojiahong' Peach Leaves

作　　者：贾浩[1] 郝建博 曹洪波[1] 韩艳[1] 李丹[1] 陈海江[1] 

机构地区：[1]河北农业大学园艺学院,河北保定071000

出　　处：《西北植物学报》2015年第9期1861-1867,共7页Acta Botanica Boreali-Occidentalia Sinica

基　　金：现代农业产业技术体系建设专项(CARS-31-3-02);优质耐贮桃新品种"保佳红"中试与示范(14826330D)

摘　　要：以3年生桃品种‘保佳红’为试材,于不同生育时期采用人工遮阴的方法,在叶片生长的不同时期分别设置100%(CK)、80%、60%、40%和20%自然光照的5个光照强度处理,利用快速叶绿素荧光诱导动力学曲线分析技术,研究了不同光强对桃树叶片快速叶绿素荧光诱导动力学曲线及其参数的影响。结果表明:(1)桃树各生长时期的叶片最大荧光值均随着光照强度的减弱而依次升高。(2)在PSⅡ能量分配比率方面,遮阴下的叶片提高了用于电子传递的量子比率(φEo),降低了用于热耗散的的量子比率(φDo)。(3)在PSⅡ反应中心活性方面,遮阴使得单位反应中心吸收的光能(ABS/RC)、捕获的光能(TRo/RC)、用于传递电子的能量(ETo/RC)和用于热耗散的能量(DIo/RC)均下降。(4)各时期不同光强处理的最大光化学效率Fv/Fm均在中午时段出现下降,且光照强度越大,降幅越大,说明桃叶在中午会出现强光抑制。研究认为:在遮阴条件下,桃叶天线色素吸收和捕获的光能减少,PSⅡ反应中心活性降低,但其可以通过增加能量在电子传递方面的分配比率来提高对光能的利用。Through artificial shading treatment,fast chlorophyll fluorescence induction dynamics characteristics of three-year old peach cultivar‘Baojiahong＇leaves were studied under five different light intensities（100%,80%,60%,40%and 20% of full sunlight）at different growth periods.The result showed that：（1）with the decreasing of light intensity,the maximum fluorescence gradually increased.（2）In terms of PSⅡenergy distribution ratio,the value ofφEoincreased significantly under the lower light intensity,but the value ofφDodecreased.（3）In terms of PSⅡ reaction center activity,the values of ABS/RC,TRo/RC,ETo/RC,DIo/RCdecreased significantly under the lower light intensity.（4）At all the 3growth periods investigated in this study,diurnal variations of the maximum photochemical efficiency（Fv/Fm）decreased at noon under all the 5light intensity treatments;and the higher light intensity was,the more Fv/Fmreduced.This result suggested that peach leaves had photoinhibition at noon.The present study revealed that,under low light intensity,the antenna pigment of peach leaves had the reduced fluxes of both absorption and trapped energy,and PSⅡreaction center activity decreased,while the enhanced energy distribution ratio of electron transport could improve the light efficiency.

关 键 词：桃树 遮荫 叶绿素荧光 OJIP曲线 

分 类 号：Q945.79[生物学—植物学]