Mobilization of14C in the spring following autumn assimilation of14CO2By an apple rootstock

Abstract

Summary Movement of labelled assimilates from leaves of one-year-old apple rootstocks treated with ¹⁴ CO₂ in the autumn was mainly downwards to the root system. ¹⁴ Carbonwas detected in all new leaf and shoot growth in the following spring, the level of radioactivity being greatest in the first-formed leaves. Over the winter period there was a reduction in the radioactivity of the root system and old stem, and this was accompanied by a reduction in root dry weight.