Trees

, Volume 23, Issue 5, pp 971–979

Warm temperature accelerates short photoperiod-induced growth cessation and dormancy induction in hybrid poplar (Populus × spp.)

Original Paper

DOI: 10.1007/s00468-009-0339-7

Cite this article as:
Kalcsits, L.A., Silim, S. & Tanino, K. Trees (2009) 23: 971. doi:10.1007/s00468-009-0339-7

Abstract

There is increasing evidence that temperature, in addition to photoperiod, may be an important factor regulating bud dormancy. The impact of temperature during growth cessation, dormancy development, and subsequent cold acclimation was examined in four hybrid poplar clones with contrasting acclimation patterns: ‘Okanese’—EARLY, ‘Walker’—INT1, ‘Katepwa’—INT2, and ‘Prairie Sky’—LATE. Four day–night temperature treatments (13.5/8.5, 18.5/13.5, 23.5/8.5, and 18.5/3.5°C) were applied during a 60-day induction period to reflect current and predicted future annual variation in autumn temperature for Saskatoon, SK. Warm night temperature (18.5/13.5°C) strongly accelerated growth cessation, dormancy development, and cold acclimation in all four clones. Day temperature had the opposite effect of night temperature. Day and night temperatures appeared to act antagonistically against each other during growth cessation and subsequent dormancy development and cold acclimation. Growth cessation, dormancy development, and cold acclimation in EARLY and LATE were less affected by induction temperature than INT1 and INT2 suggesting that genotypic variations exist in response to temperature. Separating specific phenological stages and the impact by temperature on each clone revealed the complexity of fall phenological changes and their interaction with temperature. Most importantly, future changes in temperature may affect time to growth cessation, subsequently altering the depth of dormancy and cold hardiness in hybrid poplar.

Keywords

Bud dormancyTemperatureAdaptationClimate change

Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Lee Anthony Kalcsits
    • 1
  • Salim Silim
    • 2
  • Karen Tanino
    • 1
  1. 1.Department of Plant Sciences, College of Agriculture and BioresourcesUniversity of SaskatchewanSaskatoonCanada
  2. 2.Agroforestry DivisionAgriculture and Agri-Food CanadaSaskatoonCanada