Journal
AMERICAN JOURNAL OF BOTANY
Volume 89, Issue 10, Pages 1644-1650Publisher
WILEY
DOI: 10.3732/ajb.89.10.1644
Keywords
dormancy; ex situ conservation; in situ conservation; Lima beam; persistent soil seed bank; Phaseolus lunatus
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Seed dormancy and its impact on the soil seed bank for wild Lima bean (Phaseolus lunatus) populations were studied in the Central Valley of Costa Rica. Five populations were selected in contrasted environments. In all cases, distribution of seeds in the soil was limited to 3 cm depth. No innate dormancy was observed but combination of hard seed coat and hilum opening controlled by environmental conditions were responsible for an induced dormancy and the constitution of a persistent seed bank. Breaking of this dormancy was obtained by a brief elevation of temperature from 25degrees to 45degreesC. Impacts of this phenomenon concern both genetic and demographic aspects of in situ conservation of the species. Consequences on ex situ conservation are mainly related with the regeneration of the seed collection.
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