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Journal of Experimental Botany, Vol. 53, No. 374, pp. 1651-1657, July 1, 2002
© 2002 Oxford University Press

Light-regulated leaf expansion in two Populus species: dependence on developmentally controlled ion transport

Received 8 August 2001; Accepted 19 March 2002

Kari A. Stiles1 and Elizabeth Van Volkenburgh1,1

1 Botany Department, Box 35-5325, University of Washington, Seattle, WA, 98195-5325, USA

Abbreviations: Em, membrane potential; TEA, tetraethylammonium.

Leaf growth responses to light have been compared in two species of Populus, P. deltoides and P. trichocarpa. These species differ markedly in morphology, anatomy, and dependence on light during leaf expansion. Light stimulates the growth rate and acidification of cell walls in P. trichocarpa but not in P. deltoides, whereas leaves of P. deltoides maintain growth in the dark. Light-induced growth is promoted in P. deltoides when cells are provided 50–100 mM KCl. In both species, light initially depolarizes, then hyperpolarizes mesophyll plasma membranes. However, in the dark, the resting Em of mesophyll cells in P. deltoides, but not in P. trichocarpa, is relatively insensitive to decade changes in external [K+]. Results suggest that light-stimulated leaf growth depends on developmentally regulated cellular mechanisms controlling ion fluxes across the plasma membrane. These developmental differences underlie species-level differences in growth and physiological responses to the photoenvironment.

Key words: Key words: Ion transport, leaf expansion, light, Populus.


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