Journal Article

Photoperiodic Regulation of a 24-kD Dehydrin-Like Protein in Red-Osier Dogwood (<i>Cornus sericea</i> L.) in Relation to Freeze-Tolerance

Dale T. Karlson, Yan Zeng, Vicki E. Stirm, Robert J. Joly and Edward N. Ashworth

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 44, issue 1, pages 25-34
Published in print January 2003 | ISSN: 0032-0781
Published online January 2003 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcg006
Photoperiodic Regulation of a 24-kD Dehydrin-Like Protein in Red-Osier Dogwood (Cornus sericea L.) in Relation to Freeze-Tolerance

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A predominant 24-kD dehydrin-like protein was previously found to fluctuate seasonally within red-osier dogwood (Cornus sericea L.) stems. The current study attempted to determine what environmental cues triggered the accumulation of the 24-kD protein and to assess its potential role in winter survival. Controlled photoperiod and field studies confirmed that photoperiod regulates a reduction of stem water content (SWC), freeze-tolerance enhancement and accumulation of the 24-kD protein. Diverse climatic ecotypes, which are known to respond to different critical photoperiods, displayed differential reduction of SWC and accumulation of the 24-kD protein. A time-course study confirmed that prolonged exposure to short days is essential for SWC reduction, 24-kD protein accumulation, and freeze-tolerance enhancement. Water deficit induced 24-kD protein accumulation and enhanced freeze-tolerance under long-day conditions. In all instances, freeze-tolerance enhancement and 24-kD protein accumulation was preceded by a reduction of SWC. These results are consistent with the hypothesis that C. sericea responds to decreasing photoperiod, which triggers a reduction in SWC. Reduced SWC in turn may trigger the accumulation of the 24-kD protein and a parallel increase in freeze-tolerance.

Keywords: Keywords: Cornus sericea — Dehydrins — Freeze-tolerance — Photoperiod — Red-osier dogwood.; Abbreviations: AK, Alaska ecotype; Jv, volume flux of water; LD, long day: LEA, late embryogenesis abundant; Lp, root hydraulic conductivity; MA, Massachusetts ecotype; NW, Northwest Territories ecotype; SD, short day; SWC, stem relative water content; UT, Utah ecotype.

Journal Article.  7388 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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