In this article:

The carbon balance in the Sultana vine is examined with emphasis on the post harvest period.

The net photosynthetic rate decreased ten fold from January to May, with 2/3 of this decline occuring in the month before leaf fall. 14C labelled assimilates are shown to move from the leaves to perennial portions of the plant during both early and late Autumn, and this 14C label reappears in shoot growth during the following spring.

However the level of carbohydrate reserves was not found to be significantly effected by the severe defoliation associated with harvest pruning.

Carbon Balance of Sultana Vine (Vitis vinifera L.) and the Effects of Autumn Defoliation by Harvest Pruning

1987, Australian Journal of Plant Physiology, vol 5, pages 561-570

csiro 475

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