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The Influence of Temperature, Irradiance and Photoperiod on the Reproductive Life History of Porphyra leucosticta (Bangiales, Rhodophyta) in Laboratory Culture

The Influence of Temperature, Irradiance and Photoperiod on the Reproductive Life History of... Abstract Laboratory culture studies were undertaken on aspects of the reproduction of the red alga Porphyra leucosticta Thuret. The life cycle of Porphyra is characterized by two different phases: 1. a leafy thallus, the haploid gametophyte and 2. a filamentous conchocelis, the diploid sporophyte. Particular attention was given to the individual effects of temperature, light intensity and photoperiod on the vegetative and the reproductive stages. A temperature optimum of 15 °C, an illumination of 9.5 Wm~ 2 and a daylight of 16 : 5 h light : dark were optimal for vegetative growth of the conchocelis. Vegetative growth of the thalli was maximal at the same temperature and irradiance as for the conchocelis, however the optimal daylength was 8 : T5 h light: dark. A similar broad tolerance to temperature was demonstrated for carpospore and conchospore induction and release, but these processes were favoured by a particular combination of irradiance and photoperiod. In contrast to the thallus, the conchocelis exists for several seasons after releasing conchospores. The complete life history can, under optimal conditions, be observed within two months. Introduction Porphyra leucosticta Thuret (Bangiaceae) is a benthic red alga. Both, the sporophytic conchocelis phase and the gametophytic thallus http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Botanica Marina de Gruyter

The Influence of Temperature, Irradiance and Photoperiod on the Reproductive Life History of Porphyra leucosticta (Bangiales, Rhodophyta) in Laboratory Culture

Botanica Marina , Volume 35 (3) – Jan 1, 1992

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References (9)

Publisher
de Gruyter
Copyright
Copyright © 2009 Walter de Gruyter
ISSN
0006-8055
eISSN
1437-4323
DOI
10.1515/botm.1992.35.3.251
Publisher site
See Article on Publisher Site

Abstract

Abstract Laboratory culture studies were undertaken on aspects of the reproduction of the red alga Porphyra leucosticta Thuret. The life cycle of Porphyra is characterized by two different phases: 1. a leafy thallus, the haploid gametophyte and 2. a filamentous conchocelis, the diploid sporophyte. Particular attention was given to the individual effects of temperature, light intensity and photoperiod on the vegetative and the reproductive stages. A temperature optimum of 15 °C, an illumination of 9.5 Wm~ 2 and a daylight of 16 : 5 h light : dark were optimal for vegetative growth of the conchocelis. Vegetative growth of the thalli was maximal at the same temperature and irradiance as for the conchocelis, however the optimal daylength was 8 : T5 h light: dark. A similar broad tolerance to temperature was demonstrated for carpospore and conchospore induction and release, but these processes were favoured by a particular combination of irradiance and photoperiod. In contrast to the thallus, the conchocelis exists for several seasons after releasing conchospores. The complete life history can, under optimal conditions, be observed within two months. Introduction Porphyra leucosticta Thuret (Bangiaceae) is a benthic red alga. Both, the sporophytic conchocelis phase and the gametophytic thallus

Journal

Botanica Marinade Gruyter

Published: Jan 1, 1992

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