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- Title
Abscisic acid concentrations and fluxes in droughted conifer saplings.
- Authors
Jackson, G. E.; Irvine, J.; Grace, J.; Khalil, A. A. M.
- Abstract
We present the first study of abscisic acid (ABA) concentrations and fluxes in the xylem sap of conifers during a drought cycle. In both <em>Pinus sylvestris</em> and <em>Picea sitchensis</em> the concentration of ABA in the sap rose 11-fold as the drought progressed. There were clear diurnal trends in this concentration, which reached its maximum (6-8 mmol ABA m-3) near the middle of the day. The fluxes of ABA were calculated by multiplying the xylem ABA fluxes in the droughted plants in the middle of the day were usually no higher than those of the controls, as a result of the very low sap flow in the droughted plants at that time. However, the ABA flux in the droughted plants was higher than in the controls in the morning, and we postulate that the stomata are responding to these 'morning doses'.
- Subjects
CONIFERS; ABSCISIC acid; SCOTS pine; DROUGHTS; EFFECT of acids on plants; PLANT hormones
- Publication
Plant, Cell & Environment, 1995, Vol 18, Issue 1, p13
- ISSN
0140-7791
- Publication type
Article
- DOI
10.1111/j.1365-3040.1995.tb00539.x