Effect of Source-sink Change on Photosynthesis and Yield of Wheat

源库变化对小麦光合作用产物及其产量影响的研究(摘要)(英文)

[Objective] The paper aims to explore the influences of source sink change of wheat at different densities on wheat yield.[Method] 225 （D1） and 320 plant/m2（D2） were adopted,then cutting flag leaf （L1）,the second last leaf （L2）,removing upper part of spike （L3） and controlling （CK） were used to conduct field experiment.[Result] The results showed that both of the two densities of wheat＇s 1 000-grain weight and grain filling rate after anthesis in a decreasing order of L3〉CK〉L2〉L1,and the grain weight per spike and dry matter amount translated after anthesis turned to be CK〉L2〉L1 〉L3.[Conclusion].Both of leaf-cutting and spikelet removing decreased the grain weight per spike and dry matter amount translated after anthesis.Removing upper part of spike increased wheat＇s 1 000-grain weight.But the decreasing of the sink and dry matter amount translated contributed to the decreasing of the yield of wheat.

[目的]探讨不同密度小麦的源库变化对小麦产量的影响。[方法]采用225株/m2(D1),320株/m2(D2)2种种植密度,并进行剪旗叶(L1)、剪倒二叶(L2)、剪上半穗(L3)和不做处理(对照)4个处理进行田间试验。[结果]不同种植密度的小麦灌浆速率和千粒重均表现为L3>对照>L2>L1;小麦穗粒重和各器官干物质转移量密切相关,不同种植密度的小麦各器官干物质转移量和穗粒重均表现为对照>L2>L1>L3。[结论]剪叶处理均显著降低了小麦千粒重和干物质转移量,导致产量显著降低,且剪旗叶处理产量下降显著高于剪倒二叶;剪上半穗处理千粒重显著增加,但由于库容量显著减小、干物质转移量显著下降,致使产量显著降低。