Plant Cold Acclimation: The Role of Abscisic Acid |
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Authors: | L V Gusta R Trischuk C J Weiser |
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Institution: | (1) Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, SK, S7N 5A8, Canada;(2) Department of Horticulture, Oregon State University, Corvallis, OR, 97331, USA |
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Abstract: | The freezing tolerance or cold acclimation of plants is enhanced over a period of time by temperatures below 10°C and by a
short photoperiod in certain species of trees and grasses. During this process, freezing tolerance increases 2–8°C in spring
annuals, 10–30°C in winter annuals, and 20–200°C in tree species. Gene upregulation and downregulation have been demonstrated
to be involved in response to environmental cues such as low temperature. Evidence suggests ABA can substitute for the low
temperature stimulus, provided there is also an adequate supply of sugars. Evidence also suggests there may be ABA-dependent
and ABA-independent pathways involved in the acclimation process. This review summarizes the role of ABA in cold acclimation
from both a historical and recent perspective. It is concluded that it is highly unlikely that ABA regulates all the genes
associated with cold acclimation; however, it definitely regulates many of the genes associated with an increase in freezing
tolerance. |
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Keywords: | Freezing tolerance Gene induction ABA responsive element Hormones |
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