Flowering requirements of Polymnia canadensis (Asteraceae) and their influence on its life history variation |
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Authors: | Martin H Bender Jerry M Baskin Carol C Baskin |
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Institution: | (1) School of Biological Sciences, University of Kentucky, Lexington, KY 40506-0225, USA;(2) Present address: The Land Institute, 2440 East Water Well Road, Salina, KS 67401, USA |
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Abstract: | The purpose of this study is to determine the flowering requirements of Polymnia canadensis and how they correspond to the occurrence of winter annuals, biennials, and short-lived monocarpic perennials in this species. Polymnia canadensis has a vernalization requirement for flowering, and even very small plants (i.e., those with one pair of leaves) can be vernalized. Vernalized plants can flower under both long- and short days. However, to flower plants must attain a minimum postvernalization size. Plants of this primarily monocarpic species that do not die after they flower once require another period of vernalization to flower a second time (i.e., to be dicarpic). Vernalized plants exposed to high temperatures can be devernalized; these must be re-vernalized in order to flower. |
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Keywords: | Devernalization Facultative biennial Photoperiod Postvernalization size for flowering Prevernalization size for flowering Vernalization |
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