文献类型： 外文期刊

作者： Chen, JW ¹ ; Zhang, SL ² ; Zhang, LC ² ; Zhao, ZZ ² ; Xu, JG ² ;

作者机构： 1.Zhejiang Univ, Coll Agr & Biotechnol, Dept Hort, Hangzhou 310029, Peoples R China

2.Zhejiang Univ, Coll Agr & Biotechnol, Dept Hort, Hangzhou 310029, Peoples R China; Zhejiang Acad Agr Sci, Inst Hort, Hangzhou 310021, Peoples R China; Zhejiang Acad Agr Sci, Citrus Res Inst, Huangyan 318020, Peoples R China

关键词： satsuma mandarin;fruit photosynthesis;photosynthate;translocation;partitioning;sugar accumulation

期刊名称：ACTA BOTANICA SINICA （ 影响因子：0.599； ）

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收录情况： SCI

摘要： Dynamics of dry- or fresh-weight of fruit, peel photosynthetic rate and chlorophyll content, and the characteristics of translocation and distribution of radiolabelled assimilates from leaf or fruit were examined in developing satsuma mandarin (Citrus unshiu Marc. cv. Miyagawa wase) fruit from primary stage of fruit enlargement up to fruit full ripe. Change in fruit photosynthetic rate was some what related to the change in the chlorophyll content of peel. Fruit photosynthetic rate markedly declined as chlorophyll degradation occurred in the peel. Before full ripe stage of the fruit, photosynthates produced by a ~(14)C-fed leaf were mainly distributed to juice sacs even during periods when dry matter accumulation in peel was more rapid than that in juice sacs. At the full ripe stage, peel photosynthetic rate approached zero and peel became the major sink of leaf photosynthates. Most of the peel assimilates, however, remained in situ for up to 48 h after feeding CO_2 to the fruit, only a small portion being transported to other parts of fruit. The percentage of fruit photosynthates exported decreased with fruit development and ripening, but the peak rate of export to juice sacs amount to as high as 12% . The sugar content and dry weights of peel and juice sacs in shaded fruit were lower than that in the control frail. These results show that peel assimilate was mainly consumed in peel respiration and growth and thus the dependence on leaf photosynthates decreased. Part of this assimiate was used in sugar accumulation in juice sacs of fruit.