Life history and photoperiodic responses inchondrus giganteusformaflabellatus(gigartinaceae, rhodophyta) from japan
Guiry, Michael D.
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Brodie, Juliet; Masuda, Michio; Guiry, Michael D. (1994). Life history and photoperiodic responses inchondrus giganteusformaflabellatus(gigartinaceae, rhodophyta) from japan. European Journal of Phycology 29 (3), 159-164
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 a 16 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.