ABSTRACT
SUMMARY. The scope of this review is limited to hormonal involve ment in the induction of woody bud endodormancy and does not address dormancy maintenance or release. Knowledge of hormonal regulation of processes has become increasingly more complex, particularly with recent findings of auxin-and ethylene-triggered abscisic acid induction revealing many more responses mediated by ABA than originally con sidered. The intent of this review is to provide an account of the current state of knowledge of hormones in bud dormancy research within an his torical context with a focus on promising avenues of research. While hormones are undoubtedly involved at some point during dormancy in duction, meaningful progress in unraveling the mechanism of endodormancy-induction is difficult through this hormone-centered approach. The path to dormancy acquisition is a continuum. In many plants, this path begins far earlier than the traditionally-examined autumn period. Aside from more useful hormonal localization studies within the bud and utilization of mutants, continued gross analysis of hormone pres ence/absence during dormancy induction may not be fruitful. Examin-
Karen K. Tanio is affiliated with the Department Plant Sciences, 51 Campus Drive, College of Agriculture, University of Saskatchewan, Saskatoon, SK, S7N 5A8, Canada (E-mail: tanino@sask.usask.ca).
