کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4528076 1625843 2012 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of short-term and prolonged saturation on seed germination of Amazonian floodplain forest species
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم آبزیان
پیش نمایش صفحه اول مقاله
Effects of short-term and prolonged saturation on seed germination of Amazonian floodplain forest species
چکیده انگلیسی

Many tropical floodplain species show enhanced germination after submergence in annual flood waters. In this study, we tested seed germination response to time in water (ranging 2–84 d) among Amazonian floodplain species. To test seed response to short-term saturation, seeds from ten flood-tolerant woody species were air-dried or placed in water (i.e., saturated) for 45 h before germination. Germination rates varied across species, achieving 50% germination in 12–58 d among saturated seeds and 2–84 d among air-dry seeds. Short-term saturation enhanced germination of the five shade-tolerant species by 14–100%. Three light-demanding species (Pseudobombax, Cordia, and Vitex) increased germination by 3–48% following air-drying. Cecropia and Laetia had poor germination in germination chambers (<20%), but Cecropia doubled germination rates in sunlit shade houses. Long-term saturation (removing seeds at 2-week intervals over 12 weeks) of four species showed that prolonged submergence enhanced germination only among Crataeva. The wind-dispersed Pseudobombax was intolerant of submergence >14 d, while water-and fish-dispersed Crataeva seeds increased germination rates with submergence time, peaking at 6 weeks and maintaining >80% germination for up to 12 weeks. None of the ten flood-tolerant species required prolonged submergence for germination. Short-term saturation was sufficient to stimulate germination for most species, while prolonged submergence enhanced germination for one species, Crataeva. While species differed in seed physiology and seed size, they grouped into successional guilds of light-demanding species with dry-tolerant seeds and shade-tolerant species with recalcitrant seeds.


► We tested the effects of saturation on ten flood-tolerant species from Amazon flooded forests.
► Zero of ten flood-tolerant species required prolonged submergence for germination.
► Light-demanding species had dry-tolerant seeds.
► Shade-tolerant species had recalcitrant seeds that required saturation to germinate.
► One of four species showed increased germination with increased time underwater.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Aquatic Botany - Volume 99, May 2012, Pages 49–55
نویسندگان
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