间作遮荫对花生光合作用及叶绿素荧光特性的影响

Effect of Shading on Photosynthesis and Chlorophyll Fluorescence Characteristic of Peanut under Different Inter-row Space in Cassava-peanut Intercropping

以花生单作为对照,设置30、35、40、45、50 cm 5个木薯花生间作行距,播种90 d后测定花生叶片的净光合速率、叶绿素含量及叶绿素荧光参数。结果表明,与单作对照相比,间作花生的光合速率(Pn)、叶绿素含量(Chl a+b)、初始荧光(Fo)、光化学猝灭系数(qP)降低;最大荧光(Fm)、可变荧光(Fv)、最大光化学效率(Fv/Fm)、潜在光化学活性(Fv/Fo)、非光化学淬灭系数(qN)升高;且窄行距(30～35 cm)处理的Pn、Fv、Fv/Fm、Fv/Fo、表观光合电子传递速率(ETR)、实际光化学量子效率(Yield)高于宽行距(45～50 cm)处理。间作遮荫使花生功能叶片的光合速率和叶绿素含量降低,叶绿素荧光参数的一系列变化是花生对间作遮荫的适应性反应。

The net photosynthetic rate,chlorophyll content and chlorophyll fluorescence characteristic of peanut （Arachis hypogaea L.） were determined under different inter-row space of cassava/peanut intercropping（30,35, 40,45,50 cm） and monocropping in the field after 90 d of sowing.The result showed that the net photosynthetic rate and chlorophyll（Chl a＋b） content,initial fluorescence（Fo）,photochemical quenching（qP） in leaves of peanut intercropped with cassava decreased.However,the maximum fluorescence（Fm）,variable fluorescence（Fv）, maximum photochemical efficiency（Fv/Fm）,potential activity of photosystem II（Fv/Fo,non-photochemical quenching（qN） of intercropped peanut increased.Moreover,Pn,Fv,Fv/Fm,Fv/ Fo,apparent electron transport rates（ETR） and effective quantum yield of photosystem II（Yield） of peanut intercropped under 30-35 cm inter-row treatment were more than those under 40-45 cm row space.In conclusion,the shading of intercropping decreased net photosynthetic rate and chlorophyll content of peanut in leaves,and these changes of chlorophyll fluorescence characteristic showed that peanut had flexibility to shading stress under intercropping.