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Annals of Botany 88: 537-543, 2001
© 2001 Annals of Botany Company

Anomalous Pressure Volume Curves of Resurrection Plants Do Not Suggest Negative Turgor

Clare Vander Willigen+, Jill M. Farrant and N. W. Pammenter

Botany Department, University of Cape Town, Private Bag, Rondebosch, 7701, South Africa Department of Molecular and Cellular Biology, University of Cape Town, Private Bag, Rondebosch, 7701, South Africa School of Life and Environmental Sciences, George Campbell Building, University of Natal, Durban, 4041, South Africa

Received: 31 January 2001 ; Returned for revision: 12 March 2001 . Accepted: 1 June 2001

Pressure-volume (PV) curves of the desiccation-tolerant angiosperms, Eragrostis nindensis, Craterostigma wilmsii and Xerophyta humilis, and the desiccation-sensitive species, E. curvula, were compared. The shape of curves for E. nindensis and C. wilmsii differed from the usual curvilinear form. Over the relative water content (RWC) range of approx. 70 to 25%, PV curves indicated water potentials higher than directly measured water activity on frozen-thawed tissue. Anatomical studies showed considerable cell wall folding and a consequent reduction in cell volume in these two species; this was not seen in X. humilis or E. curvula which showed normal PV curves. It is suggested that this wall folding may have prevented the development of negative turgor and physical stress in the cells, and contributed to desiccation tolerance. Copyright 2001 Annals of Botany Company

Negative turgor, Craterostigma, Eragrostis, Xerophyta, psychrometry, water relations, water activity, PV isotherm, resurrection plants, desiccation tolerance


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C. Vander Willigen, N. W. Pammenter, S. G. Mundree, and J. M. Farrant
Mechanical stabilization of desiccated vegetative tissues of the resurrection grass Eragrostis nindensis: does a TIP 3;1 and/or compartmentalization of subcellular components and metabolites play a role?
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