Display Settings:

Format

Send to:

Choose Destination
Plant Physiol. 1984 Jan;74(1):77-80.

Temperature-Induced Change in the Water Relations of Abies amabilis (Dougl.) Forbes.

Author information

  • 1College of Forest Resources, University of Washington, Seattle, Washington 98195.

Abstract

Water conductance through Abies amabilis seedlings was measured while the roots were exposed to temperatures from 15 to 0.25 degrees C. Before conductance was measured, the seedlings were preconditioned for 3 months at either a high temperature (23 degrees C) or a low temperature (3 degrees C). For both groups of seedlings, conductance decreased as root temperature decreased. Conductance was lowest at 0.25 degrees C. In addition, preconditioning at 3 degrees C for 3 months significantly lowered conductance to water at all root temperatures. Under the same environmental conditions, seedlings preconditioned at 3 degrees C had less than 25% of the transpirational water loss of seedlings preconditioned at high temperature. A decrease in leaf osmotic potential also resulted from low temperature preconditioning. In trees growing in the subalpine forest, which is the natural habitat of Abies amabilis, both decreased leaf conductance to water vapor and lower osmotic potentials were evident in winter. Since in winter the temperature of the soil in the subalpine zone remains less than 1 degrees C for many months, lowered leaf conductance and decreased osmotic potentials appear to be mechanisms which aid in preventing desiccation damage.

PMID:
16663390
[PubMed]
PMCID:
PMC1066627
Free PMC Article
PubMed Commons home

PubMed Commons

0 comments
How to join PubMed Commons

    Supplemental Content

    Icon for HighWire Icon for PubMed Central
    Loading ...
    Write to the Help Desk