This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Web of Science (54) Citing Articles via Google Scholar Google Scholar Articles by Schultz, H. R. Articles by Matthews, M. A. Search for Related Content PubMed PubMed Citation Articles by Schultz, H. R. Articles by Matthews, M. A. Agricola Articles by Schultz, H. R. Articles by Matthews, M. A.

Environmental and Stress Physiology

Resistance to Water Transport in Shoots of Vitis vinifera L. ¹

Relation to Growth at Low Water Potential

Department of Viticulture and Enology, University of California, Davis, California 95616

Apparent resistances to water transport in the liquid phase were determined from measurements of soil, root, basal shoot internode, shoot apex, and leaf water potentials and water flux in Vitis vinifera (cv White Riesling) during soil drying. Predawn water potential differences () in the shoots accounted for 20% of the total between the soil and the shoot apex when plants were well-watered but increased to about 90% when shoot growth ceased. The from soil to root was essentially constant during this period. At low water potential, the in the shoot was persistent when transpiration was low (predawn) or completely prevented (plant bagging). The apparent hydraulic resistance between the basal shoot internode and most rapidly expanding leaf (or shoot apex) increased several-fold when water was withheld. Leaf and internode expansion both exhibited high sensitivity to increasing hydraulic resistance. Measurements of pneumatic resistance to air flow through frozen internode segments indicated progressive vapor-filling of vessels as soil drying progressed. From these observations and others in the literature, it was suggested that embolization may be a common occurrence and play an important role in the inhibition of shoot growth at moderate water deficits.

¹ Supported in part by a grant 8502539 from the U.S. Department of Agriculture Competitive Research Grants Office.

This article has been cited by other articles:

				M. Keller and L. J. Mills Effect of Pruning on Recovery and Productivity of Cold-Injured Merlot Grapevines Am. J. Enol. Vitic., September 1, 2007; 58(3): 351 - 357. [Abstract] [Full Text] [PDF]

				M. Keller Deficit Irrigation and Vine Mineral Nutrition Am. J. Enol. Vitic., September 1, 2005; 56(3): 267 - 283. [Abstract] [Full Text] [PDF]

				A. J. McElrone, J. L. Sherald, and I. N. Forseth Interactive effects of water stress and xylem-limited bacterial infection on the water relations of a host vine J. Exp. Bot., January 2, 2003; 54(381): 419 - 430. [Abstract] [Full Text] [PDF]

				A.G. Netting pH, abscisic acid and the integration of metabolism in plants under stressed and non-stressed conditions: cellular responses to stress and their implication for plant water relations J. Exp. Bot., February 2, 2000; 51(343): 147 - 158. [Abstract] [Full Text] [PDF]

				J. Flexas, M. Badger, W. S. Chow, H. Medrano, and C. B. Osmond Analysis of the Relative Increase in Photosynthetic O2 Uptake When Photosynthesis in Grapevine Leaves Is Inhibited following Low Night Temperatures and/or Water Stress Plant Physiology, October 1, 1999; 121(2): 675 - 684. [Abstract] [Full Text]

				Z. Lu and P. M. Neumann Water Stress Inhibits Hydraulic Conductance and Leaf Growth in Rice Seedlings but Not the Transport of Water via Mercury-Sensitive Water Channels in the Root Plant Physiology, May 1, 1999; 120(1): 143 - 152. [Abstract] [Full Text]