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Sori formation in Laminaria japonica was studied from the ecological and physiological point of view. Cutting through the medulla of Laminaria japonica improved the formation of sori.Sori formation under different water temperature, photoperiod, and light intensity was investigated and total nitrogen and reducible sugar content determined. The result showed that son of L. japonica can be formed in 1-22℃ water in Dalian. No sori were found in water over 23℃. High temperature inhibits the formation of son, but low temperature has no effect. Apparently, light intensity affects the formation of sori, but photoperiod does not. In shallow water L. japonica grows slower but stores dry material faster and forms sori rapidly. In deeper water it grows faster in length but stores dry material slower and the sori formation is slow. Analysis of dry material shows that during sori formation the water content decreases but total nitrogen and total reducible sugar increase.Only when the storage of sugar reaches a cer 相似文献
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