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Open Access Life history and photoperiodic responses in Chondrus giganteus forma flabellatus (Gigartinaceae, Rhodophyta) from Japan

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The life history and photoperiodic responses of the carrageenophyte Chondrus giganteus forma flabellatus (Rhodophyta) from Japan were investigated in culture. This entity has a Polysiphonia-type life history and the formation of both tetrasporangia and cystocarps is controlled by daylength. A night-break of 1 h in the middle of a 16 h night was effective in inhibiting reproduction, confirming the classical photoperiodic nature of the response. Tetrasporangia formed at daylengths of 12 h or less, whereas cystocarps only developed at daylengths of 10 h or less. The formation of spermatangia required daylengths of 12 h or less, but production was not inhibited by a night-break of 1 h in the middle of a 16 h night.

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Keywords: Chondrus giganteus f. flabellatus; Carrageenophyte; life history; photoperiodism; short-day response

Document Type: Research Article

Affiliations: 1: Science Department, Bath College of Higher Education, Newton Park, Newton St Loe, Bath, BA2 9BN, UK 2: Division of Biological Sciences, Graduate School of Science, Hokkaido University, Sapporo, 060, Japan 3: The Martin Ryan Marine Science Institute and Department of Botany, University College Galway, Galway, Ireland

Publication date: 01 August 1994

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