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1 January 2007 Imbibition and Germination of Seeds of Colubrina oppositifolia (Rhamnaceae), a Federal-Endangered Tree Species Endemic to Hawaii
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Abstract

Considerable variation in seed dormancy has been reported for Colubrina species. Most freshly-matured seeds of Colubrina oppositifolia have water-impermeable seed coats (physical dormancy). At 28(12 h)/20(12 h), 25(12 h)/15(12 h) °C and ca. 24 °C (room temperatures), 99–100% of the seeds imbibed, and 96–100% of the seeds that germinated did so in 27–34 days. Daily weighing of individual seeds showed that start of imbibition (= 5% increase in mass) at room temperature ranged from < 1 to 20 days. Thus, at high temperature, physical dormancy is broken so rapidly that technically most seeds would be classified as nondormant (i.e. germinate in ≤30 days). At 15(12 h)/6(12 h) and 20(12 h)/10(12 h) °C, 93 and 96%, respectively, of the seeds had imbibed after 30 days, but only 12 and 50%, respectively, of the seeds that germinated did so in 30 days. Eleven months of dry storage at room temperatures increased rates of imbibition and germination of seeds incubated at 28/20 and 20/10 °C. Based on the relatively rapid rates at which seeds become water-permeable and germinate when incubated on a moist substrate, we predict that the soil seed bank of this endangered species may be only short-lived. Thus, seeds would imbibe and germinate (or die) during the first wet season following their dispersal.

Carol C. Baskin, Jerry M. Baskin, and Alvin Yoshinaga "Imbibition and Germination of Seeds of Colubrina oppositifolia (Rhamnaceae), a Federal-Endangered Tree Species Endemic to Hawaii," Natural Areas Journal 27(1), 25-30, (1 January 2007). https://doi.org/10.3375/0885-8608(2007)27[25:IAGOSO]2.0.CO;2
Published: 1 January 2007
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