| Wx基因对灌浆期小麦不同叶位叶片光合特性的影响 |
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| 引用本文： | 覃 鹏,孔治有,唐李军.Wx基因对灌浆期小麦不同叶位叶片光合特性的影响[J].麦类作物学报,2014,34(7):917-921. |
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| 作者姓名： | 覃 鹏 孔治有 唐李军 |
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| 作者单位： | （1.云南农业大学农学与生物技术学院，云南昆明 650201； 2.保山学院资源环境学院，云南保山 678000； 3.德宏州农业科学研究所，云南芒市 678400） |
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| 基金项目： | 国家自然科学基金项目（31000712） |
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| 摘 要： | 为了解Wx基因对小麦光合作用的影响,对8个小麦Wx近等基因系的不同叶位叶片光合参数进行了测定和分析。结果表明,小麦叶片净光合速率、气孔导度、胞间CO2浓度和蒸腾速率在叶位和基因型间均有极显著差异,缺失单个Wx基因使叶片光合参数下降,且降幅表现为Wx-D1Wx-A1Wx-B1;胞间CO2浓度不影响光合作用,不同叶位叶片光合参数明显呈旗叶倒二叶倒三叶,但WxABD(糯小麦)光合参数在叶位间没有显著差异;Wild type和WxABD总体光合能力和产量相对较高。以上结果说明,Wx基因的缺失会引起叶片光合能力下降,不利于小麦产量形成。
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| 关 键 词： | 小麦 Wx基因 光合特性 叶位 灌浆期 |
Effect of Wx Genes on Photosynthetic Characteristics of Different Position Leaf of Wheat at Filling Stage |
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| QIN Peng,KONG Zhiyou,TANG Lijun.Effect of Wx Genes on Photosynthetic Characteristics of Different Position Leaf of Wheat at Filling Stage[J].Journal of Triticeae Crops,2014,34(7):917-921. |
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| Authors: | QIN Peng KONG Zhiyou TANG Lijun |
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| Abstract: | Synthesis of starch in wheat grain is affected not only by the key enzymes of starch synthesis, but also by photosynthesis regulation, absence of the Wx gene may influence the starch synthesis and the photosynthesis in wheat to a large extent. The effect of Wx gene on photosynthetic characteristics of wheat leaves at different positions was investigated with 8 Wx near isogenic lines in this study, the results showed that net photosynthetic rate, stomatal conductance, intercellular CO2 concentration and transpiration rate were significantly different among leaf positions and genotypes, the effect of absence of Wx genes on photosynthetic characteristics was as Wx D1>Wx A1>Wx B1; intercellular CO2 concentration on photosynthesis was not significantly affected; Significant variation in photosynthetic characteristics of leaves at different positions was observed as that of flag leaf > top second leaf > top third leaf; there were no significant difference among flag leaf, top second leaf and top third leaf of WxABD (waxy wheat). The photosynthetic capacity and yield of wild type and WxABD were all relatively higher. To summarize, the deletion of Wx gene might cause the decline of flag leaf photosynthetic capacity, and was not conducive to wheat grain yield formation. |
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| Keywords: | Wheat Wx gene Photosynthetic characteristics Leaf position Filling stage |
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