Plant Physiol. Illumina
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

This Article
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in Web of Science
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via CrossRef
Right arrow Citing Articles via Web of Science (21)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Marshall, J. G.
Right arrow Articles by Dumbroff, E. B.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Marshall, J. G.
Right arrow Articles by Dumbroff, E. B.
Agricola
Right arrow Articles by Marshall, J. G.
Right arrow Articles by Dumbroff, E. B.

Turgor Regulation via Cell Wall Adjustment in White Spruce1

John G. Marshall2 and Erwin B. Dumbroff*

Department of Biology, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1

Turgor regulation at reduced water contents was closely associated with changes in the elastic quality of the cell walls of individual needles and shoots of naturally drought-resistant seedlings of white spruce (Picea glauca [Moench] Voss.) and of seedlings of intermediate resistance that had been pretreated with paclobutrazol, a stress-protecting, synthetic plant-growth regulator. Paclobutrazol-treated seedlings showed marked increases in drought resistance, and pressure-volume analysis combined with Chardakov measurements confirmed observations that water stress was ameliorated during prolonged drought. Turgor was maintained in the paclobutrazol-treated and in the naturally resistant drought-stressed seedlings despite water contents near or below the turgor-loss volumes of well-watered controls. The maintenance of turgor in these seedlings was in large part a function of the dynamic process of cell wall adjustment, as reflected by marked reductions in both the saturated and turgor-loss volumes and by large increases in the elastic coefficients of the tissues. Shear and Young's moduli, calculated from pressure-volume curves and the radii and wall thicknesses of mesophyll cells, also confirmed observed changes in the elastic qualities of the cell walls. Elastic coefficients of well-watered, paclobutrazol-treated seedlings were consistently larger than those in well-watered controls and several times larger than the values in untreated plants, which succumbed rapidly to drought. In contrast, untreated seedlings that withstood prolonged drought without wilting displayed elastic coefficients similar to those in seedlings that had been treated with paclobutrazol but that had not been exposed to drought.

1   J.G.M. was supported by graduate fellowships from Forestry Canada and the Natural Sciences and Engineering Research Council of Canada (NSERC). A research operating grant from NSERC to E.B.D. is also gratefully acknowledged.
2   Present address: Department of Surgery, Toronto General Hospital, Room 1-917, Max Bell Research Wing, 200 Elizabeth Street, Toronto, Ontario, Canada M5G 2C4.
*   Corresponding author; e-mail dumbroff{at}agri.huji.ac.il; fax 972-8-946-8263.

Plant Physiol. (1999) 119: 313-320
Copyright Clearance Center:   0032-0889/99/119//08
© 1999 American Society of Plant Physiologists




This article has been cited by other articles:


Home page
 ANN BOT (LOND)Home page
E. A. BRAY
Classification of Genes Differentially Expressed during Water-deficit Stress in Arabidopsis thaliana: an Analysis using Microarray and Differential Expression Data
Ann. Bot., June 15, 2002; 89(7): 803 - 811.
[Abstract] [Full Text] [PDF]

Home page
 Plant Cell PhysiolHome page
S. Kawasaki, C. Miyake, T. Kohchi, S. Fujii, M. Uchida, and A. Yokota
Responses of Wild Watermelon to Drought Stress: Accumulation of an ArgE Homologue and Citrulline in Leaves during Water Deficits
Plant Cell Physiol., July 1, 2000; 41(7): 864 - 873.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1999 by the American Society of Plant Biologists