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作者	单位
覃鹏，孔治有，唐李军	（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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中文摘要:

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 D1>Wx A1>Wx 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。

英文摘要:

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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