大豆始粒期荚遮光对荚粒物质积累的影响

以黑河17等13份大豆品种(系)为材料,始粒期采用整株荚遮光法研究分析豆荚对粒重的相对光合贡献及荚遮光对荚、粒物质积累的影响。结果表明,荚对粒重的相对贡献因基因型而异,变幅为0.6%~16.6%;叶面积与荚面积比值较小的龙品90-055和石豆2,较比值较大的W1和垦18,荚对粒重的相对光合贡献率高;荚遮光对粒重与荚壳重的比值影响因基因型不同呈现降低、不变和升高三种类型,其中升高类型占大多数,表明荚遮光对荚壳物质积累的抑制大于籽粒的占多数。荚遮光处理降低成熟期籽粒及荚壳中蔗糖和还原糖含量,且籽粒的降低幅度明显大于荚壳,籽粒和荚壳的淀粉含量降低幅度相近;荚遮光处理降低成熟期荚壳的淀粉含量,其降幅明显大于蔗糖和还原糖。

Effect of pod shading on pod and seed matter accumulation at soybean seed formation stage

Heihe17 and other 12 soybean cultivars were used as materials to study the relative photosynthesis service of pod to seed weight and effect of pod shading to pod and seed matter accumulation by whole plant pod shading.The results indicated that the pods of different genotype had differently relative photosynthesis service rate,changing from 0.6% to 16.6%.For Longpin90-055 and Shidou2, with low ratio value of leaf area and pod area,the rate of pod relative photosynthesis service to seed weight is greater than that of W1 and Ken18 with higher ratio value of leaf area and pod area.Different genotypes had various effects on ratio value of seed weight and pod husk weight under the pod shading condition,and there were three sorts: decrease,changelessness and increase,with the sort of increase being the majority,which indicated that pod shading restrained pod husk matter accumulation more significantly than seeds.Pod shading decreased sugar and revive sugar content of seeds and pod husks at ripe stage,the decreasing range of seed was more obviously than pod husk,while there were approximate range of starch content of seed and pod husk.Pod shading treatment decreased starch content of pod husk at ripe stage,and the decreasing range was more obviously than sugar and revive sugar.