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作者	单位
张甲元，周苏玫，尹钧，刘万代，李巧云，石珊珊，年力	（河南农业大学农学院，国家小麦工程技术研究中心，河南郑州 450002）

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中文摘要:

为了解适期晚播对小麦生育后期光合性能的影响，以弱春性小麦强筋品种郑麦9023、中筋品种偃展4110和弱筋品种豫麦50为材料，研究了不同播期（旱播10月17日、适播10月24日、晚播10月31日）下小麦灌浆期旗叶的光合性能和产量特征。结果表明，郑麦9023晚播的籽粒产量比适播低8.26%，比早播高4.68%；偃展4110和豫麦50晩播籽粒产量分别比适播和早播平均高14.38%和18.55%。灌浆期各品种的叶面积指数晚播与适播处理差异不大，但均明显高于早播，平均高出12.7%；郑麦9023和偃展4110旗叶叶绿素含量晩播高于适播和早播，尤其花后14 d后差异达显著水平；旗叶净光合速率晚播处理中郑麦9023一直较高，偃展4110在花后21 d后明显高于适播和早播，豫麦50花后0~7 d较高。3个品种的灌浆速率晩播处理也占明显的优势。因此，适期晩播能维持弱春性小麦品种灌浆期较好的光合性能，获得较高的籽粒产量。

英文摘要:

To understand the effects of late sowing on photosynthetic performance of flag leaves during grain filling stage, the weak spring wheat varieties Zhengmai 9023(strong gluten), Yanzhan4110 (middle gluten) and Yumai 50 (weak gluten) were used as materials and sowed at different date. The result indicated that the grain yield of Zhengmai 9023 at late sowing was 8.26% lower than that at sowing on time and 4.68% higher than that at early sowing; The grain yield in average of Yanzhan4110 and Yumai 50 at late sowing were 14.38%, 18.55% higher than that at sowing on time and early sowing. The leaf area index of each varieties at late sowing had no difference with that sowing on time during grain filling stage, but that of them were significantly higher than that at early sowing，with an average of 12.7%; The chlorophyll content of Zhengmai 9023 and Yanzhan4110 at late sowing were higher than that at sowing on time and early sowing, especially at 14 days after anthesis; The net photosynthetic rate of Zhengmai 9023 at late sowing was the highest all over the grain filling stage, that of Yanzhan4110 at late sowing was significantly higher than that sowing on time and early sowing at 21 days after anthesis, and for Yumai 50 was at 0~7 days after anthesis. The late sowing for the three varieties have advantage on net photosynthetic rate too. Thus, suitable late sowing can maintain better photosynthetic performance of weak spring wheat during the grain filling stage and can improve their yields.

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