Relationship between soluble sugar and soluble protein content in leaves,buds and fruits of Idesia polycarpa and its alternate bearing years
[Objective]Provide a reference for artificially regulating the occurrence of alternate bearing years in Idesia polycarpa.[Method]Three types of I.polycarpa were used as test materials for three fruit-bearing types of Chengdu provenance,namely no alternate fruiting,incomplete alternate fruiting,completely alternate fruiting,the leaves,buds and fruits of fruit-bearing shoots and fruitless shoots were picked at the fruit expansion stage,oil accumulation stage,flower bud differentiation stage and fruit ripening stage,and the contents of soluble sugar and soluble protein were determined by anthony colorimetric method and coomassie brilliant blue staining method,respectively.[Result]In three different alternate bearing of I.Polycarpa,the soluble sugar content in leaves with and without fruit-bearing twigs initially decreased and then increased during fruit development.Meanwhile,the soluble sugar content in buds initially increased and then decreased,while that in fruits exhibited an upward trend.As the fruit develops,the soluble protein content in buds and fruits,both with and without fruit-bearing twigs,continues to increase across the three types of fruit-bearing years.The soluble protein content in the leaves of fruit-bearing twigs initially decreased and then increased,whereas the trend in the leaves of non-fruit-bearing twigs was inconsistent.The ratio of soluble sugar to soluble protein content in the buds and leaves of fruit-bearing young branches of three types was higher than that in the buds and leaves of non-fruit-bearing young branches.During different stages of fruit development,the ratio of soluble sugar content in buds and fruits to soluble sugar content in leaves of fruit-bearing young branches initially increased and then decreased with fruit development.However,the ratio of soluble protein content in buds and fruits to soluble protein content in leaves did not change significantly with fruit development and had not reached a significant level.During the fruit enlargement period,the three types of fruit sizes were ranked from high to low in terms of the ratio of soluble sugar and soluble protein content in the leaves as NAB(16.64),IAB(9.93),and CAB(5.95).This indicated that a higher ratio of soluble sugar and soluble protein content in the leaves during the fruit enlargement period was more favorable for the accumulation of soluble sugar and soluble protein in the buds during the flower bud differentiation period.[Conclusion]The occurrence of alternate bearing years in I.polycarpa is attributed to the competition between fruit development and flower bud differentiation for soluble sugars and soluble proteins.During the fruit enlargement period,a higher ratio of soluble sugar content to soluble protein content in leaves ensures a sufficient nutritional supply during the flower bud differentiation stage,thereby promoting flower bud differentiation and preventing the occurrence of alternate bearing years.
Idesia polycarpasoluble sugarsoluble proteinbranch typealternate bearing type
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