Boron uptake by peach leaf slices

Abstract The objective of this study was to determine if plasma‐lemma transport is a limiting step for boron (B) uptake by peach leaf. Only about 0.3% of the B applied could be absorbed by peach (Prunus persica L. Batsch) leaves when enriched 10B‐boric acid was used as a tracer. Boron uptake increased proportionally to the external B concentration in the range of 1 mM to 20 mM. The highest B content was found in the 20 mM treatment. Boron uptake was rapid for the initial 6 to 8 hours, but it then slowed down steadily until the end of the experiment. A linear correlation between the external B concentration and leaf B content was obtained (y =‐8.98 + 46.1×, R2 = 0.999). pH had a profound effect on B uptake by peach leaf slices with pH 7 and 8 had the highest B absorption. Boron uptake was strongly dependent on temperature over the 2°C to 40°C range. Peach leaf slices had the highest B absorption at 40°C. B uptake decreased sharply when the temperature dropped to 2°C. Adenosine Triphosphate (ATP) increased ...