Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 7-Day Trial for You or Your Team.

Learn More →

Modification of Drought Resistance by Water Stress Conditioning in Acacia and Eucalyptus

Modification of Drought Resistance by Water Stress Conditioning in Acacia and Eucalyptus Abstract Plants of Acacia and Eucalyptus species were grown under different levels of shading, nutrition, and irrigation to assess the effect of these factors on plant water use. Water use per unit of leaf (phyllode) area was affected only by the irrigation treatment, control plants that had received water daily using appreciably more water than plants that had been repeatedly subjected to water stress. Water stress conditioning had little or no effect on plant height, leaf (phyllode) area, or minimum stomatal resistance in any of the species. Detailed study of the water stress conditioning of Eucalyptus robusta showed that controls used 46% more water than conditioned plants. Leaf area and plant height were unaffected by conditioning. Control of transpiration was not due to stomatal functioning, both sets of plants operating with the same leaf diffusive resistance under conditions of ready water availability. Hydraulic conductivity of the intact root system was lowered by conditioning and it is suggested that this was due, at least in part, to the effect that conditioning had on root xylem conductivity. Specific conductivity of stem sections was lowered by water stress conditioning. Water stress avoidance was also associated with a more pronounced tendency for stomata to close prior to wilting and with a higher level of leaf resistance which could be maintained at a low leaf water potential. Conditioned plants exhibited drought tolerance in their ability to control loss of water from the leaf at lower leaf water potentials than the controls. This content is only available as a PDF. Author notes 1Present address: CIAT, Apartado Aereo 6713, Cali, Colombia © Oxford University Press http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Experimental Botany Oxford University Press

Modification of Drought Resistance by Water Stress Conditioning in Acacia and Eucalyptus

CLEMENS,, J.; JONES, P., G.
Journal of Experimental Botany , Volume 29 (4) – Aug 1, 1978
Download PDF
10 pages

Loading next page...
 
/lp/oxford-university-press/modification-of-drought-resistance-by-water-stress-conditioning-in-YDcekG22Fj

References (0)

References for this paper are not available at this time. We will be adding them shortly, thank you for your patience.

Publisher
Oxford University Press
Copyright
© Oxford University Press
ISSN
0022-0957
eISSN
1460-2431
DOI
10.1093/jxb/29.4.895
Publisher site
See Article on Publisher Site

Abstract

Abstract Plants of Acacia and Eucalyptus species were grown under different levels of shading, nutrition, and irrigation to assess the effect of these factors on plant water use. Water use per unit of leaf (phyllode) area was affected only by the irrigation treatment, control plants that had received water daily using appreciably more water than plants that had been repeatedly subjected to water stress. Water stress conditioning had little or no effect on plant height, leaf (phyllode) area, or minimum stomatal resistance in any of the species. Detailed study of the water stress conditioning of Eucalyptus robusta showed that controls used 46% more water than conditioned plants. Leaf area and plant height were unaffected by conditioning. Control of transpiration was not due to stomatal functioning, both sets of plants operating with the same leaf diffusive resistance under conditions of ready water availability. Hydraulic conductivity of the intact root system was lowered by conditioning and it is suggested that this was due, at least in part, to the effect that conditioning had on root xylem conductivity. Specific conductivity of stem sections was lowered by water stress conditioning. Water stress avoidance was also associated with a more pronounced tendency for stomata to close prior to wilting and with a higher level of leaf resistance which could be maintained at a low leaf water potential. Conditioned plants exhibited drought tolerance in their ability to control loss of water from the leaf at lower leaf water potentials than the controls. This content is only available as a PDF. Author notes 1Present address: CIAT, Apartado Aereo 6713, Cali, Colombia © Oxford University Press

Journal

Journal of Experimental Botany – Oxford University Press

Published: Aug 1, 1978

There are no references for this article.