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Published on March 7, 2002; 10.1104/pp.010885

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Received September 27, 2001
Returned for revision November 29, 2001
Accepted January 11, 2002

Molecular Analysis of Signals Controlling Dormancy and Growth in Underground Adventitious Buds of Leafy Spurge

David P. Horvath *, Wun S. Chao , and James V. Anderson

United States Department of Agriculture, Agricultural Research Service, Biosciences Research Laboratory, P.O. Box 5674, State University Station, Fargo, North Dakota 58105--5674

* Corresponding author; email: horvathd{at}fargo.ars.usda.gov.

Dormancy and subsequent regrowth of adventitious buds is a critical physiological process for many perennial plants. We have used the expression of hormone and cell cycle-responsive genes as markers to follow this process in leafy spurge (Euphorbia esula). In conjunction with earlier studies, we show that loss of mature leaves results in decreased sugar levels and increased gibberellin perception in underground adventitious buds. Gibberellin is sufficient for induction of S phase-specific but not M phase-specific gene expression. Loss of both apical and axillary buds or inhibition of polar auxin transport did not result in induction of S phase- or M phase-specific gene expression. Loss of polar auxin transport was necessary for continuation of the cell cycle and further bud development if the S phase was previously initiated.




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