Analysis of the Contribution Rate of Capsule Photosynthesis to the Traits Related to Grain Weight Formation in Sesamum indicum
We analyzed the effect and contribution rate of the capsule photosynthesis to the traits related to grain weight formation,i.e.,fresh weight per capsule(FWC),fresh weight of wall per capsule(FWW),dry weight of wall per capsule(DWW),fresh weight of grain per capsule(FGW),and dry weight of grain per capsule(DGW).The findings demonstrated that,with the exception of FWW,all four traits did not alter substantially from the control group under the shade treatment.This suggested that the photosynthesis of leaves and stems could swiftly offset the effects of the capsule photosynthesis.The photosynthetic contribution rates of the capsule in L1 and S1 at 40 DAP was comparable to that of DWW and DGW,this indicated that the formation of seed weight diversity in L1 and S1 was related to the photosynthetic contribution of the capsule,and that the photosynthetic contribution of the leaves and stems to the formation of grain weight in sesame materials with different seed weight was rather close.Under the girdling treatment,all five traits were significantly different with the control,suggesting that the photosynthesis of leaves and stems could not be fully compensated by the capsule after girdling treatment,which had a significant impact on the development of capsules and the formation of grain weight.Furthermore,the photosynthetic contribution rates of capsules to FWC,DWW and DGW increased accompanying with the development of the capsules,implying that capsule photosynthesis may have a compensatory enhancing effect.Especially,the capsule photosynthesis of L1 at 40 DAP contributed to DWW and DGW significantly more than those of S1,which further confirmed that the grain weight formation of L1 may be related to the higher photosynthetic contribution of capsules.
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