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Annals of Botany 62: 449-454, 1988
© 1988 Annals of Botany Company

RESEARCH-ARTICLE

Water Relations of Potato Leaves. II. Pressure—Volume Analysis and Inferences About the Constancy of the Apoplastic Fraction

J. VOS* and P. J. OYARZÚN{dagger}

Centre for Agrobiological Research (CABO) Wageningen, The Netherlands
*Department of Field Crops and Grassland Science, Agricultural University Wageningen, The Netherlands
{dagger}Research Station for Arable Farming and Field Production of Vegetables Lelystad, The Netherlands

Accepted: 21 April 1988   

Water relations characteristics of potato (Solanum tuberosum L. cv. Bintje) leaves were determined from pressure—volume analysis using a pressure chamber. Turgor was 0·77 MPa and the bulk volumetric modulus of elasticity 8·1 MPa at full turgidity; turgor loss occurred when water potential ({psi}) had declined to –0·87 MPa at a relative water content (RWC) of 0·912; the apoplastic water fraction (A) was 0·235. As is usually found, there was a linear relation between 1/{psi} and RWC beyond turgor loss. This finding supports the assumptions of the constancy of A during leaf dehydration.

Beyond turgor loss the difference between {psi} and {pi} [measured after freezing and thawing ({pi}d)] was about 0·1 MPa. This difference did not increase as the leaf water content decreased. This result contradicts the constancy of A.

It was concluded from calculations with a simple model of leaf dehydration that analysis of the relation between {psi} and {pi}d provides more insight in the changes in the apoplastic fraction than the relation between 1/{psi} and RWC. Research on the size of the apoplastic fraction and its changes with water potential would complement current understanding of leaf water relations.

Solanum tuberosum, L., water potential, pressure chamber, osmotic potential, pressure potential, relative water content, apoplast, symplast


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