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Effect of Several Factors on the Expression of Dormancy in Western Ironweed

Published online by Cambridge University Press:  12 June 2017

F. S. Davis  and
M. K. McCarty
F. S. Davis
Affiliation:
Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, College Station, Texas, and Lincoln, Nebraska
M. K. McCarty
Affiliation:
Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, College Station, Texas, and Lincoln, Nebraska
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Abstract

Internal dormancy (the state of internally arrested growth) in western ironweed (Vernonia baldwini Torr.) buds consisted of a recurring annual cycle of high and low activity with transition periods. Trends in sprouting activity were similar regardless of whether activity was measured by sprouting of buds following removal of stems in the field, or by sprouting of rhizome section buds in moist sand. Bud activity measurement was quantitatively different by the two methods, however, and the apparent period when internal dormancy developed also differed. A number of interdependent factors modified activity. At various points in the cycle, the stem apex inhibited bud growth; the stem alone inhibited bud growth; a transient block due to immaturity occurred in some buds; and two temperature-related blocks occurred. Bud age and location on the rhizome had little effect on activity. During the period of internal dormancy, sprouting of buds apparently stimulated activity of adjacent buds. Temperature greatly affected expression of internal dormancy; prolonged moist cold treatment eliminated it.

Type
Research Article
Information
Weeds , Volume 14 , Issue 1 , January 1966 , pp. 62 - 69
Copyright
Copyright © 1966 Weed Science Society of America 

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References

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