SEASONAL VARIATION OF PHOTOSYNTHETIC CARBON FLOW RATE INTO YOUNG WALNUT AND ITS PARTITIONING AMONG THE PLANT ORGANS AND FUNCTIONS

摘要

Daily fluxes of photoassimilates into young, branched walnut trees were investigated over the whole season through gas exchange measurements. Their partitioning among the different plant organs and functions was assessed by quantitative C-14 labelling in August and October. At harvest, 7 hours or 5 days after labelling, the labelled compounds were partitioned among 4 fractions: starch, sugars, lipids, and the residue fraction containing all other compounds, mainly cell walls and proteins.