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Title of Journal: Trees

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Abbravation: Trees

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Springer-Verlag

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10.1007/s10439-010-0213-1

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1432-2285

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Salt allocation during leaf development and leaf f

Authors: John W Cram Peter G Torr Derek A Rose
Publish Date: 2002/01/09
Volume: 16, Issue: 2-3, Pages: 112-119
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Abstract

By taking samples along individual branches and measuring leaf size thickness and Na+ and K+ concentrations we have shown in Bruguiera cylindrica Avicennia rumphiana and Avicennia marina that there are two phases of salt accumulation by leaves This is confirmed by reanalysis of published data for other species The first phase is a rapid increase in leaf content as it grows from bud to maturity the second is a slower but continuous change in quantity in the leaf via changes in ion concentration and/or in leaf thickening Leaf thickening must not be overlooked in estimating changes in leaf contents with age Generally leaf Na+ content increases significantly and K+ content falls slightly Mangrove leaves thus continue as sinks for Na+ throughout their lifetime At the end of a leafs life just before abscission no burst of salt accumulation has been found Yellow senescent leaves do not have higher Na+ than old green ones We point out that leaf drop involves losing both salt and biomass not just salt and hence does not reduce the salt concentration in the plant We conclude that leaf drop is not a salt excretion mechanism but is simply the point in time at which the leaf ceases to accumulate salt Using a simple model the contribution to salt accumulation of slowly accumulated Na+ by mature leaves has been calculated For B cylindrica the most extensively studied species 60 of the salt in the leaf is accumulated slowly in the mature phase thus more than during the initial phase of rapid expansion growth The limited data suggest that glandbearing species show smaller changes in mature leaf Na+ content than do glandless species

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