| 套作模式下玉米荫蔽对大豆叶片叶绿体结构及光合特性的影响 |
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| 引用本文： | 谭婷婷,范元芳,李盛蓝,王仲林,杨峰,杨文钰.套作模式下玉米荫蔽对大豆叶片叶绿体结构及光合特性的影响[J].核农学报,2020,34(10):2360-2367. |
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| 作者姓名： | 谭婷婷 范元芳 李盛蓝 王仲林 杨峰 杨文钰 |
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| 作者单位： | 四川农业大学农学院/农业部西南作物生理生态与耕作重点实验室/四川省作物带状复合种植工程技术研究中心,四川 成都 611130 |
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| 摘 要： | 为探讨玉米大豆套作模式下大豆叶片叶绿体及光合荧光特性对荫蔽的响应,本研究选用南豆12、桂夏3号为试验材料,设置大豆单作(CK)、单行玉米行间套作大豆(A1)和两行玉米带间套作大豆(A2)3个处理,分析大豆叶片叶绿体超微结构和光合荧光参数。结果表明,与CK相比,套作玉米荫蔽下两品种大豆叶片叶绿体基粒厚度、基粒面积/叶绿体面积、淀粉粒面积和淀粉粒面积/叶绿体面积增加,且荫蔽下南豆12基粒厚度和淀粉粒面积/叶绿体面积高于桂夏3号;叶绿体基粒数量在品种间存在差异,南豆12较CK增加,而桂夏3号降低。与CK相比,荫蔽下大豆叶片厚度、栅栏组织厚度显著降低,南豆12在A1、A2下叶片厚度、上表皮厚度、下表皮厚度和栅栏组织厚度均高于桂夏3号。荫蔽下大豆叶片PSⅡ潜在活性(Fv/Fo)和PSⅡ原初光能转化效率(Fv/Fm)显著增加,但气孔导度(Gs)、蒸腾速率(Tr)、净光合速率(Pn)和实际光化学效率(Fq'/Fm')显著降低。南豆12在A1、A2下的Pn和Fq'/Fm' 高于桂夏3号。综上,套作玉米荫蔽直接影响大豆叶片结构特征和光合荧光特性,但品种间响应存在显著差异。本研究可为耐荫性套作大豆品种的选育提供一定的理论参考。
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| 关 键 词： | 套作 大豆 叶绿体 光合参数 荧光参数 |
| 收稿时间： | 2019-08-12 |
Effects of Maize Shading on Chloroplast Structure and Photosynthetic Characteristics of Soybean Leaves Under Intercropping Pattern |
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| TAN Tingting,FAN Yuanfang,LI Shenglan,WANG Zhonglin,YANG Feng,YANG Wenyu.Effects of Maize Shading on Chloroplast Structure and Photosynthetic Characteristics of Soybean Leaves Under Intercropping Pattern[J].Acta Agriculturae Nucleatae Sinica,2020,34(10):2360-2367. |
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| Authors: | TAN Tingting FAN Yuanfang LI Shenglan WANG Zhonglin YANG Feng YANG Wenyu |
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| Institution: | College of Agronomy, Sichuan Agricultural University/Key Laboratory of Crop Ecophysiology and Farming System in Southwest,Ministry of Agriculture/Sichuan Engineering Research Center for Crop Strip Intercropping System, Chengdu, Sichuan 611130 |
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| Abstract: | In order to investigate the response of chloroplast and photosynthetic fluorescence characteristics of soybean leaves to the shading under the maize-soybean intercropping model, Nandou 12 and Guixia 3 were chosen as experiment materials in this study, setting soybean monocropping (CK), single row of maize intercropping (A1) and two rows of maize ribbons intercropping (A2) three treatments to analyze the chloroplast ultrastructure and photosynthetic fluorescence parameters of soybean leaves. The results showed that the chloroplast basal thickness, granule area/chloroplast area compared with CK, starch granule area and starch granule area/chloroplast area compared with CK soybean leaves increased under shading of intercropping maize, Not only that the basal grain thickness and starch granule area/chloroplast area under shading of Nandou 12 were higher than Guixia 3 under the shading, but the number of chloroplast granules varied significantly between varieties, with Nandou 12 increasing and Guixia 3 decreasing. The thicknesses of the leaf, palisade tissue and sponge tissue were significantly reduced under the shading compared with CK. The leaf thickness, upper epidermis thickness, lower epidermis thickness and palisade thickness of Nandou 12 in A1 and A2 were all higher than Guixia 3. In addition, under the shading, the potential activity of PSⅡ (Fv/Fo) and the maximal PSⅡ quantum yield in the dark (Fv/Fm) of soybean leaves were significantly increased, and the stomatal conductance (Gs), transpiration rate (Tr), net photosynthetic rate (Pn) and actual photochemical efficiency (Fq'/Fm') were significantly reduced. Moreover, Pn and Fq'/Fm' of Nandou 12 under A1 and A2 were both higher than Guixia 3. Therefore, the intercropping of maize shading directly affects the structural characteristics and photosynthetic fluorescence characteristics of soybean leaves, but there is a significant difference in response between varieties. This study can provides a theoretical reference for the breeding of shade-tolerant intercropped soybean varieties. |
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| Keywords: | intercropping soybean chloroplast photosynthetic parameters fluorescence parameters |
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