Effects Of Changing Source-Sink Relationship On Yield And Quality In Soybeans

JiYu 47 and JiYu 54 were tested in the testing land of JiLin Agriculture University. The research had six handles,by removing leaves and removing pods:CK,didn't handle; T₁, removing 1/4 leaves(left one leaf of every four leaves); T₂, removing 1/3 leaves(left one leaf of every three leaves); T₃, removing 1/2 leaves(left one leaf of every two leaves); T₄, removing 1/4 pods(left one node pod of every four nodes); and T₅, removing 1/3 pods(left one node pod of every three nodes).All of them were handled respectively in different stages,took samples after 72 hours.The net photosynthetic rate,shape index,yield and quality index were studied.The results show as the following:1 Effect of shape index of remainder leaves on the change of source-sink relationship in different growth stages.Changing the source-sink relationship in different stages has different effect on soybean height.All the removing leaves handles in different growth stages,removing 1/4 leaves of two breeds increase slightly larger than CK does. Removing 1/3 and 1/2 leaves of two breeds decrease than CK does.Different handles in two breeds are: removing 1/4 leaves slightly increase than CK does,removing 1/3 leaves decrease greatly than CK does ,secondly removing 1/2 leaves.And removing 1/4 leaves is most obviously lower than CK does in podding stage, removing 1/3 and 1/2 leaves are most obviously higher than CK does in this stage. There are no obvious effect on removing pods to plant height.During blooming stage and podding stage,leaf area index of remainder leaves is lower than CK does.Different handles of two breeds in the two growth stages are: removing 1/2 leaves greatly decrease than CK does, secondly removing 1/3 leaves and thirdly removing 1/4 leaves.The growth stages are: removing leaves decrease obviously during blooming stage.And the effect on growth stage are:firstly great filling stage,secondly beginning filling stage,thirdly podding stage,finally blooming stage.2 Effect of Pn and physiologic and biochemistry index of remainder leaves on the change of source-sink relationship in different growth stages.With the change of source-sink relationship in different growth stages,Pn increase during blooming stage and podding stage,but decrease during the following stage.And the variation of specific leaf weight,chlorophyll content,soluble sugar content and soluble protein contentdecrease with the number of removing leaves. After removing leaves in different growth stages,the specific leaf weight, chlorophyll content, soluble sugar content of remainder leaves of removing 1/2 leaves in two breeds are firstly decrease than CK does, secondly removing 1/3 leaves and thirdtly removing 1/2 leaves . Every index of removing 1/2 leaves has the obviously changed in two breeds. The growth stages are :great filling stages is the first, beginning filling stage is the second, podding stage is the third and blooming stage is the last. After removing pods,Pn, specific leaf weight , chlorophyll content and soluble sugar content of remainded leaves are higher than CK does,every index of removing 1/3 pods has the largest increase in the two breeds.Different handles of two breeds in the two growth stages are: removing 1/3 pods and then removing 1/4 pods.The growth stages are:great filling stage,beginning filling stage followed. And soluble protein content is decrease.3 Effect of yiled index on the change of source-sink relationship in different growth stages.After removing leaves in different growth stages,the efficient pods every plant, seed per pod, 100 seed weight and yield every plant and yield of hectare in two soybean are decrease, and the decrease of removing 1/2 leaves is most obvious. The growth stages are.firstly greatly filling stage, secondly begin filling stage, thirdly podding stage,finally blooming stage. It shows that photosynthetic leaf area in the great filling stage is crucial of great yield.After removing pods during begin filling stage and great filling stage , the efficient pods every plant,and yield every plant and yield of hectare are decrease,but the seed per pod, 100 seed weight of different handles in two breeds are higher than CK does. It shows that the efficient pods every plant in filling stage is crucial of large yield.4 Effect of quality index on the change of source-sink relationship in different growth stages.After removing leaves in different growth stages,the fat content of the two soybean are lower than CK does,but they are higher than CK does after removing pods. Different handles in two breeds of removing leaves are:the index decreases with decrease of number of removing leaves, removing 1/2 leaves is markly decreased.The growth stages are: great filling stage is the first, beginning filling stage is the second, podding stage is the third and blooming stage is the last.The analyse shows that different handles of two breeds have marked difference.Different handles of removing pods of two breeds are: removing 1/3 pods is moreobvious than removing 1/4 pods,the growth stages are:great filling stage,then beginning filling stage .After removing leaves in different growth stages,the preotein content of the two soybeans are higher than CK does,but they are lower than CK does after removing pods. Different handles in two breeds of removing leaves are: removing 1/2 leaves greatly increases than CK does,secondly removing 1/3 leaves,fmally removing 1/4 leaves.The growth stages respectively are: great filling stage,beginning filling stage, podding stage and blooming stage.Different handles of removing pods of the two breeds are: removing 1/4 pods greatly decreases than CK does,removing 1/3 pods followes.The growth stages respectively are: beginning filling stage,then great filling stage. It shows that the formation rule of the fat and protein is just different.