Photosynthetic activity of the non-dormant <Emphasis Type="Italic">Posidonia oceanica</Emphasis> seed |
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Authors: | David Celdrán Arnaldo Marín |
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Institution: | 1.Dpto. Ecología e Hidrología,Universidad de Murcia,Murcia,Spain |
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Abstract: | The photosynthetic adaptive features of non-dormant seeds in Posidonia oceanica were studied in order to evaluate the effects of light on germination success. Transmission electron micrographs showed the
presence of chloroplasts in the epidermal cells, close to the nucleus at the periphery of the cytoplasm. The well-developed
thylakoid membranes and the presence of starch granules indicated that the chloroplasts were photosynthetically active. The
relationship between photosynthesis versus irradiance in P. oceanica seeds incubated at 15 and 21°C was analysed. The net photosynthesis in the non-dormant seed of P. oceanica was positive and compensated its respiration demand (90 μmol quanta m−2 s−1) at both temperatures. Net photosynthesis was negative at the other irradiance values. To test the effects of light on germination
success, seeds were placed both in dark and light conditions. Germination success was significantly higher in light rather
than in dark condition. The characteristics observed in the photosynthesis in P. oceanica seed could be a mechanism to guarantee seedling survival in temperate waters, demonstrating though the specialized nature
of this species. |
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