Phototropic leaf movements and photosynthetic performance in an amphibious fern, Marsilea quadrifolia |
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Authors: | Wen-Yuan Kao Bai-Ling Lin |
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Institution: | (1) Institute of Ecology and Evolutionary Biology, National Taiwan University, Taipei, Taiwan;(2) Department of Life Science, National Taiwan University, Taipei, Taiwan;(3) Genomic Research Centre, Academia Sinica, Taipei, Taiwan |
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Abstract: | Diurnal phototropism has not been reported in ferns. In this study we found that the four leaflets of the amphibious fern
Marsilea quadrifolia are capable of adjusting their leaflet angle and leaflet azimuth in response to changes in the position of the sun’s direct
beam, exhibiting more diaphototropic movements (orienting the plane of the lamina perpendicular to incident light) in the
morning and late afternoon, and more paraphototropic movements (orienting the plane of the lamina parallel to incident light)
at noon. In addition, by cutting off the leaflet lamina and covering portions of leaflets with black tape, the junction between
the leaflet and petiole was found to be responsible for light reception. Among the light spectrum investigated, blue light
was the most effective at inducing diaphototropism. The role of diurnal phototropism in enhancing carbon return and ameliorating
photoinhibition was also evaluated. It was concluded that diurnal phototropic leaf movement represents one of the plastic
responses enabling this amphibious fern to grow under terrestrial conditions. |
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Keywords: | |
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