Figure 4

Qualitative and quantitative representation of carbon export within an Arabidopsis rosette. Picture (A) and autoradiogram (B) of a Col-0 rosette where leaf 8 was labelled with ¹⁴CO₂, as described in Figure 2. The plant was exposed to the film for 9 days. (C) Quantitative analysis of the amount of ¹⁴C in different rosette leaves. Mean ± SE (n = 4). In this experiment, leaf 8 was labelled for 5 min, followed by a chase period of 1 h in air. The leaves were harvested separately for quantitative analysis. Leaf 1 (L1) is the first emerging leaf, L2 the next etc. R denotes the sample containing the leaves younger than leaf 16, the stem and meristem.