Changes in partitioning of current assimilate during tuber bulking in potato (Solanum tuberosum L.) cv Maris Piper
1985
Oparka, K.J.
Potato plants were labelled with 14CO2 at six stages during tuber bulking and changes in current assimilate partitioning (20 h after 14CO2 assimilation) were examined in relation to increasing tuber size on a plant. There was no relationship between the node of origin of a tuber and the amount of 14C which entered it, and those tubers on a plant which imported the most 14C did not all belong to the same stem. However, competition within a node was evident as many tubers borne on second-order stolons were smaller and contained significantly lower concentrations of 14C than those on primary stolons. Two weeks after tuber initiation there was an almost linear relationship between the fresh weights of the tubers and their 14C content but the correlation became less good at subsequent harvests. Within the tubers the ratio of 14C starch: soluble fell over the course of the experiment and was reflected in an increase in the percentage of 14C sucrose appearing in the tubers at each harvest. At any one harvest, however, the 14C starch: soluble ratios were similar but not related to the rates of 14C import of the tubers. The data are consistent with the view that sucrose is compartmentalized in potato tubers.
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