Effects of temperature and irradiance on early development of Chondrus ocellatus Holm (Gigartinaceae, Rhodophyta)
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Chondrus is a type of commercially produced red seaweed that widely used for food and carrageen extraction. Although the natural life history of the alga had been well understood, the factors influencing development of the tetraspore and carpospore remain poorly understood. In the perspective of seedling resources, the regulation of early development is crucial for the seedling nursing; therefore, it is necessary to understand the physiological influences during its early development. In this study, we studied the effects of temperature and irradiance on the early development of Chondrus ocellatus Holm under laboratory conditions. The released tetraspores and carpospores were cultivated at different temperatures (10–28°C) and irradiances (10, 60 μmol photons m−2s−1) with a photoperiod of 12L:12D. The results indicate that both tetraspores and carpospores are tolerant to temperatures of 10–25°C, and have the highest relative growth rate at 20°C. Irradiance variances influenced the growth of the discoid crusts, and the influence was more significant with increasing temperature; 60 μmol photons m−2s−1 was more suitable than 10 μmol photons m−2s−1. The optimum temperature and irradiance for the development of seedlings was 20°C and 60 μmol photons m−2s−1, respectively.
KeywordChondrus ocellatus temperature irradiance early development
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- Chen M Q, Ren G Z. 1985. The development process of sporelings of Gracilaria verrucosa (Hudson) Papenfuss. Oceanologia et Limnologia Sinica, 16(3): 181–187.Google Scholar
- Enright C T, Craigie J S. 1981. Effects of temperature and irradiance on growth and respiration of Chondrus crispus Stackhouse. In: Levring T ed. Proceedings of the International Seaweed Symposium. Walter de Gruyte, Berlin. p. 271–276.Google Scholar
- Hori T. 1993. An Illustrated Atlas of the Life History of Algae. Vol. 2. In: Brown and Red Algae. Uchdia Roka-kuho Publishing Co., Ltd., Tokyo. Japan.Google Scholar
- Ji Y K, Guo J. 1992. The effect of temperature on the growth and development of Chondrus ocellatus. Journal of Dalian Fisheries College, 7: 32–37.Google Scholar
- Komiyama T, Sasamoto M. 1957. Studies on the propagation of Gracilaria verrucosa (Huds.) Papenfuss I. On the settling of the spores and development of the early stage. Report of the Investigations on the Ariake Sea, 4: 25–34.Google Scholar
- Noda H. 1990. Antitumor activity of marine algae. Proc Int. Seaweed Symp., 13: 577–584.Google Scholar
- Provasoli L. 1968. Media and prospects for the cultivation of marine algae. In: Watanabe A, Hattori A eds. Cultures and Collection of Algae. Japanese Society of Plant Physiology, Tokyo. p. 63–77.Google Scholar
- Taylor A R A, Chen L C M. 1994. Chondrus Stackhouse. In: Akatsuka I ed. Biology of Economic Algae. SPB Academic Publishing, Hague. p. 35–76.Google Scholar