Turnover of Carbohydrates in Relation to Growth in Apple Trees. II. Distribution of 14C Assimilates Labelled in Autumn, Spring and Summer

One-year-old plants of the apple rootstocks MM. 106 and M.7were allowed to assimilate ¹⁴CO₂ in autumn, spring and summerand the distribution of the tracer within the plant over a growingseason was followed. In MM.106 distribution of the tracer intwo fractions of extractable carbohydrate and the residues representingstructural material, was determined. The results of the radioactivityassay are discussed in relation to seasonal patterns of assimilatesupply and demand in the different regions of the plant. Malus sylvestris L, apple, ¹⁴C assimilates, distribution of carbohydrates