Changes of Carbohydrate Content and C/N in Branches and Leaves during Flower Bud Differentiation of Tianhong 2 Apple
The changes of carbohydrate content and C/N in the leaves and branches of short and medium branches with different rootstocks during flower bud differentiation in Tianhong 2 apple were studied.The results showed that the flowering rate of Tianhong 2 apple was not affected by rootstocks during the stable yield stage.During the whole flower bud differentiation period,in the same branch of SH40 interstock and vigorous stock,the contents of soluble sugar,sucrose,fructose and nitrogen exhibited higher levels in leaves compared to branches,while the content of starch and C/N displayed lower levels.Within SH40 interstock,the contents of starch and fructose were lower in leaves of short branch with high flowering rate compared to those in leaves of medium branch with low flowering rate.The contents of soluble sugar,sucrose and C/N were higher in leaves of short branch than those in leaves of medium branch from the initial differentiation stage to petal primordium stage.The contents of soluble sugar,fructose and C/N were lower in branches of short branch than those in medium branch,and the starch content was higher in branches of short branch than that in medium branch before the petal primordium stage.Similarly for vigorous stock,the contents of soluble sugar,starch,fructose and C/N were lower in leaves of short branch with high flowering rate compared to those in leaves of medium branch with low flowering rate.The contents of soluble sugar,fructose and C/N were lower in branches of short branch than those in medium branch,and the starch content was lower in branches of short branch than that in medium branch during the transformation stage.It was concluded that carbohydrate content and C/N did not play a decisive role in apple flowering.During the whole flower bud differentiation period,there was an increasing trend in the soluble sugar content in leaves,while the content of starch and C/N in branches showed a fluctuating upward trend,suggesting that the accumulation of carbohydrates and C/N was essential for the morphological differentiation of Tianhong 2 apple flower buds.
国家科技期刊平台
NSTL
万方数据
