Loss of desiccation tolerance in imbibed seeds: Implications for seed mortality

M. I. Daws, S. Bolton, David Francis Robert Philip Burslem, Christopher Mullins, N. C. Garwood

Research output: Contribution to journalArticle

Abstract

During germination, orthodox seeds loose their ability to tolerate desiccation. We determined whether the critical proportion of a seed's germination time after which desiccation tolerance is lost (CIP) is constant within and between species for nine species of neo-tropical pioneer trees. Seeds were imbibed for various periods before being desiccated. Following desiccation, seeds were re-imbibed and subsequent germination recorded. We found that the CIP was constant within species and was similar for the different species (60–70% of the germination time). Consequently, the maximum number of seeds that can be killed by a single desiccation event, during germination, should increase in seedlots that either have a longer time to germination, or have a narrow range of times to germination. This prediction provides an empirical explanation for the typically observed across species relationship of an increasing spread of germination times within increasing time to 50% germination.
Original languageEnglish
Pages (from-to)501-501
Number of pages1
JournalSouth African Journal of Botany
Volume73
Issue number3
Early online date11 Jun 2007
DOIs
Publication statusPublished - Jul 2007

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