| 苗期弱光对花生光合特性的影响 |
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| 引用本文： | 张昆,万勇善,刘风珍.苗期弱光对花生光合特性的影响[J].中国农业科学,2010,43(1):65-71. |
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| 作者姓名： | 张昆 万勇善 刘风珍 |
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| 作者单位： | （作物生物学国家重点实验室/山东农业大学农学院） |
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| 基金项目： | 国家公益性行业科研专项项目，国家科技支撑计划重点项目 |
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| 摘 要： | 【目的】探讨苗期不同弱光条件下花生(Arachis hypogaeaL.)叶片光合特性的变化规律,为合理规划麦套花生布局提供理论依据。【方法】以丰花1号为供试材料,在花生苗期用不同透光率的黑色遮阳网进行遮光,设置不遮光(CK)、遮光27%、遮光43%和遮光77%4个处理。测定遮光后花生功能叶片的叶绿素含量、净光合速率、光合曲线参数、荧光参数以及光合酶的活性,比较不同遮光处理间的差异。【结果】遮光后随遮光程度的增强,花生叶片净光合速率(Pn)显著降低,气孔导度(Gs)、细胞间隙CO2浓度(Ci)、光补偿点、光饱和点、CO2补偿点、CO2饱和点、羧化效率、RUBPCase和PEPCase活性显著降低;叶绿素含量、表观量子效率显著增加,实际光化学效率ФPSⅡ和最大光化学效率(Fv/Fm)升高;即时光强和长期遮光处理均能明显降低光合酶的活性。【结论】苗期遮光显著降低花生叶片的光合速率,原因是气孔限制、非气孔因素即叶肉细胞光合活性下降和光系统Ⅱ光能分配变化;提高了花生利用弱光的能力;遮光27%的影响较小,可据此合理规划麦套花生的种植规格。
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| 关 键 词： | 花生 遮光 光合特性 叶绿素荧光 |
| 收稿时间： | 2009-03-05; |
Effects of Weak Light on Photosynthetic Characteristics of Peanut Seedlings |
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| ZHANG Kun,WAN Yong-shan,LIU Feng-zhen.Effects of Weak Light on Photosynthetic Characteristics of Peanut Seedlings[J].Scientia Agricultura Sinica,2010,43(1):65-71. |
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| Authors: | ZHANG Kun WAN Yong-shan LIU Feng-zhen |
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| Affiliation: | ZHANG Kun,WAN Yong-shan,LIU Feng-zhen (1National Key Laboratory of Crop Biology/College of Agronomy,Sh,ong Agricultural University,Tai\'an 271018,Sh,ong) |
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| Abstract: | Objective]The aim of this study was to investigate the effects of weak light on the photosynthetic characteristics of peanut leaves at the seedling stage and to offer a theoredcal basis for the programming of peanut intercropped with wheat.Method]Fenghua 1 was grown in an experiment with four shading treatments(CK,in which the plants were grown under natural light,and 27% shading,43% shading,77% shading)and the investigation was carried out at seedling stage using black sunshade net.The chlorophyll content,net photosynthetic rate,photosynthetic curve,fluorescence parameters and photosynthetic enzyme activities were tested.Result]Shading treatment significantly reduced the net photosynthetic rate(Pn),stomatal conductance(Gs),intercellular CO_2 concentration(Ci),light compensation point,light saturation point,CO_2 compensation concentration,CO_2 saturation concentration,carboxylation efficiency,RUBPCase and PEPCase activities along with the shading degree but increased the chlorophyll content,apparent quantum yield,and Φ_(PSⅡ) and Fv/Fm.Real-time low light intensity and long-term shading treatment depressed photosynthetic enzyme activities jointly.Conclusion]Shading at seedling stage depressed Pn significantly,which induced by stomatal limitation and non-stomatal factors(such as decline of photosynthetic ability of mesophyll cell,changes of absorbed light allocation of PS Ⅱ),improved the capacity of utilization of weak light.Shading of 27% had less influence,and therefore can program plant the standards of intercropping system of wheat and peanut. |
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| Keywords: | peanut shading photosynthetic traits chlorophyll fluorescence |
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