Abstract
In prothallia of the fern, Adiantum capillus-veneris, chloroplasts and nuclei locate along the anticlinal wall in the dark (dark position) and along the periclinal wall under light condition (light position). For the red light-induced relocation movements of these organelles, neochrome1 (neo1) has been proved to be the photoreceptor. However, we previously reported that chloroplasts in neo1 mutants still showed relocation movement under red light (JSPP meeting 2009). The light-positioning of chloroplasts was independent from the light direction and was inhibited by photosynthesis inhibitors. In the present study, we examined the effect of red light on the positioning of nuclei in neo1 mutant. The results indicated that nuclei in neo1 mutant also showed relocation movement under red light. The positioning of nuclei was independent from the direction of red light. Further, the positioning was induced even in the dark by the addition of glucose or sucrose. Thus the light positioning of chloroplasts and nuclei under red light in A. capillus-veneris occur through photosynthesis-dependent non-directional movement as well as neo1-dependent directional movement.
