Effect of temperature and day length on the zoosporangial sorus formation and growth of sporophytes Laminaria japonica Areschoug (Laminariales, Phaeophyceae) in tank culture
2003
Kirihara, S. (Aomori-ken. Fisheries Experiment Station, Ajigasawa (Japan)) | Fujikawa, Y. | Notoya, M.
Abstract: In order to obtain mature sporophytes of Laminaria japonica for seeding, effect of seawater temperature (5, 10, 15, 20, 25 deg C and day length (15:9, 12:12, 9:15h LD) on the growth and zoosporangial sorus formation were investigated in 150 litres culture tank with flowing filtered seawater, and compare with natural seawater temperature and day length as a control experiment. The sporophytes could not survive at 25 deg C). At 10-20 deg C, the sporophytes died early with increasing higher temperature or shorter day length. Many sporophytes produced a zoosporangial sorus at 5-20 deg C and 9 D:15 L in a short culture period. Zoosporangial sorus was produced earlier more than three weeks at 5-20 deg C and 9 L:15 D and at 15 deg C and 12 L:12 D in contrast to control experiment tank. We can get mature sporophytes within a month from natural young 1st year sporophytes under these culture conditions. It is considered that the suitable conditions for the growth and maturation of sporophytes are at lower temperature in the long day conditions.
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