褐藻ジョロモクとアカモク幼胚の低照度下の生長
1993 年 59 巻 8 号 p. 1289-1295
詳細
1993 年 59 巻 8 号 p. 1289-1295
The effect of low light intensity on thallus and rhizoid growth of the germlings of Myagropsis myagroides and Sargassum horneri was studied. The germlings were cultured for 8 weeks at 20°C under two different light intensities with 12L/12D and total darkness. In both species, the thalli and rhizoids of the germlings grew well at 2000-2800lx. In S. horneri, furthermore, under this condition many adventitious branches were formed from rhizoids of individuals. In M. myagroides and S. horneri, the thalli and rhizoids of the germlings grew very slowly under the conditions of total darkness and 200-300lx. In both species, however, after 8 weeks under these conditions no individuals detached from the substratum or died. Moreover, the germlings of these two species had been cultured for 2, 4, and 6 weeks under these conditions, after which they were transferred to the condition of 2000-2800lx and cultured for 2 weeks. These germlings showed rapid growth after the transfer. In both species, the germlings which were cultured in this study were attached to the substratum by rhizoids. Staining with alcian blue revealed that an adhesive substance surrounded the rhizoids.
