Effect of continuous unilateral irradiation on the conchocelis of Porphyra umbilicalis (L.) J. Ag. and some other red algae
Por:
van Tussenbroek B.I.
Publicada:
1 ene 1984
Resumen:
Directional growth was induced in the conchocelis phase of Porphyra umbilicalis (L.) J. Ag. by prolonged unilateral light. The filaments of the conchocelis exhibited negative phototropism when irradiated with monochromatic light of wavelengths between 400-500 nm. Fragmented filaments were used for the experiments on phototropism; after a growing period of 4 wk, these filaments showed a phototropic reaction to continuous unilateral light within 1 day. The photoropic response increased in proportion to the logarithm of the photon flux density of the monochromatic light. The wavelength response curve showed similarities with phototropic action spectra found in the literature except that there was an additional peak near 400 nm. Phototropism was also demonstrated in ten other species of red algae, the rhizoids of which showed a negative response. The filaments of some species grew towards light. © 1984 Elsevier Science Publishers B.V.
Filiaciones:
van Tussenbroek B.I.:
Department of Marine Biology, University of Liverpool, Port Erin, Isle of Man, United Kingdom
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