Boron uptake by peach leaf slices

The objective of this study was to determine if plasmalemma 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 proport...

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Bibliographic Details
Published inJournal of plant nutrition Vol. 14; no. 8
Main Authors Shu, Z.H. (Fengshan Tropical Horticultural Experiment Station, Fengshan, Kaohsiung, Taiwan, R.O.C.), Wu, W.Y, Oberly, G.H
Format Journal Article
LanguageEnglish
Published 01.08.1991
Subjects
ABSORCION DE SUBSTANCIAS NUTRITIVAS
ABSORPTION DE SUBSTANCES NUTRITIVES
ACIDE BORIQUE
ACIDO BORICO
ADENOSINE TRIPHOSPHATE
ADENOSINTRIFOSFATO
BORE
BORO
COMPOSE PHENOLIQUE
COMPUESTOS FENOLICOS
ESTROGENOS
ESTRUCTURA CELULAR
FEUILLE
HOJAS
INHIBICION
INHIBITION
OESTROGENE
PRUNUS PERSICA
STRUCTURE CELLULAIRE
TEMPERATURA
TEMPERATURE
TRANSPORT DES SUBSTANCES NUTRITIVES
TRANSPORTE DE NUTRIENTES
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Summary:The objective of this study was to determine if plasmalemma 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 + 46.1x, 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 degrees C to 40 degrees C range. Peach leaf slices had the highest B absorption at 40 degrees C. B uptake decreased sharply when the temperature dropped to 2 degrees C. Adenosine Triphosphate (ATP) increased B uptake significantly in the range from 1 to 2 mM. ATP concentrations higher or lower than this range did not affect B uptake. Diethylstilbestrol (DES) and 2,6--Diiodo--4- nitrophenol (DNP) both inhibited B uptake with DNP the more effective inhibitor than DES. It is suggested that plasmalemma transport is not the rate limiting step in B absorption by peach leaves. Boron uptake by peach leaf slices involves both an active and a passive process with the active uptake as a major component
Bibliography:F61
F60
9148379
ISSN:0190-4167
1532-4087
DOI:10.1080/01904169109364248