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Tree Physiology Advance Access originally published online on August 20, 2009
Tree Physiology 2009 29(10):1269-1277; doi:10.1093/treephys/tpp062
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© The Author 2009. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Magnetic resonance microimaging indicates water diffusion correlates with dormancy induction in cultured hybrid poplar (Populus spp.) buds

Lee Kalcsits1,2, Edward Kendall3,4, Salim Silim1 and Karen Tanino2

1 PFRA Shelterbelt Centre, Agriculture and Agri-Food Canada, Indian Head, SK, Canada
2 Department of Plant Sciences, College of Agriculture and Bioresources, University of Saskatchewan, Saskatoon, SK, Canada
3 Discipline of Radiology, Faculty of Medicine, Janeway Child Health Centre, Memorial University of Newfoundland, St. John’s, NL, A1B 3V6, Canada
4 Corresponding author (Edward.kendall{at}mun.ca)


  Abstract

Water content and mobility, which are factors known to be associated with dormancy induction in woody plants on a tissue level, were measured using non-destructive magnetic resonance microimaging (MRMI). Two cultured poplar clones (‘Okanese’ – temperature-insensitive dormancy and ‘Walker’ – temperature-sensitive dormancy) were subjected to dormancy differentiating temperature regimes, 18.5/3.5 °C and 18.5/13.5 °C (day/night), under a short photoperiod. Apparent diffusion coefficient, an indicator of water mobility, correlated with dormancy development in the axillary bud and vascular bud trace regions. In contrast, T1 relaxation time, an indicator of static biophysical water properties, did not correlate significantly with dormancy in the regions that were examined. Although MRMI studies using T1 relaxation measurements have dominated the phytological field, our work indicates that water mobility is an important factor in studies examining water changes during dormancy induction in the critical tissues of woody plants.

Keywords: T1 relaxation

Received May 21, 2009; Accepted July 3, 2009


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