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Plant Physiol, December 2001, Vol. 127, pp. 1676-1681

Photoperiod and Temperature Interactions Regulate Low-Temperature-Induced Gene Expression in Barley1

D. Brian Fowler,* Ghislaìn Breton, Allen E. Limin, Siroos Mahfoozi, and Fathey Sarhan

Crop Development Centre, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N 5A8 (D.B.F., A.E.L., S.M.); and Département des Sciences Biologiques, Université du Québec à Montréal, Case Postale 8888, Succuvsale Centre-Ville, Montreal, Quebec, Canada H3C 3P8 (G.B., F.S.)

Vernalization and photoperiod (PP) responses are developmental mechanisms that allow plants to synchronize their growth and reproductive cycles with the seasonal weather changes. Vernalization requirement has been shown to influence the length of time that low-temperature (LT)-induced genes are up-regulated when cereal species are exposed to acclimating temperatures. The objective of the present study was to determine whether expression of LT-induced Wcs and Wcor gene families is also developmentally regulated by PP response. The LT-tolerant, highly short-day (SD)-sensitive barley (Hordeum vulgare L. cv Dicktoo) was subjected to 8-h SD and 20-h long-day PPs at cold-acclimating temperatures over a period of 70 d. A delay in transition from the vegetative to the reproductive stage under SD resulted in an increased level and longer retention of LT tolerance. Similar WCS and WCOR protein homologs were expressed, but levels of expression were much higher in plants acclimated under SD, indicating that the poor LT tolerance of long-day plants was the result of an inability to maintain LT-induced genes in an up-regulated state. These observations indicate that the PP and vernalization genes influence the expression of LT-induced genes in cereals through separate pathways that eventually converge to activate genes controlling plant development. In both instances, the delay in the transition from the vegetative to the reproductive stage produces increased LT tolerance that is sustained for a longer period of time, indicating that the developmental genes determine the duration of expression of LT-induced structural genes.

1 This research was supported by a Natural Sciences and Engineering Research Council of Canada strategic grant.

* Corresponding author; e-mail brian.fowler{at}usask.ca; fax 306-966-5015.

© 2001 American Society of Plant Physiologists


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