Abstract:

In order to give insight into uptake and distribution of 13C and 15N and hence to guide culture practice，leaves from different positions and nodes of six-year-old Cabernet Sauvignon were treated with 13CO2 and 15N-urea. It was found that photosynthate and nitrogen nutrition were not transported to each other in the leaves of shoots close to and far from trunk；The fruits on the shoots close to the trunk exhibited the stronger capacity of photosynthate acquisition（3.74 folds higher δ value）than those on the shoots far from the trunk. The closer labelled leaves to fruits exhibited the higher δ and Ndff values on the same shoot，indicating that fruits prefer to recruit photosynthate and nitrogen nutrition from leaves close to fruits. The lateral shoots of six leaves showed 0.1- and 0.8-fold high photosynthate and nitrogen nutrition in comparison to the lateral shoots with two leaves.

Key words: grape, 13C, 15N, absorption, distribution