Journal
JOURNAL OF PLANT RESEARCH
Volume 125, Issue 3, Pages 417-428Publisher
SPRINGER TOKYO
DOI: 10.1007/s10265-011-0444-8
Keywords
Actin filament; Adiantum capillus-veneris L.; Blue light; Chloroplast movement; Dark position; Microbeam
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Funding
- Japanese Ministry of Education, Sports, Science and Technology (MEXT) [17084006]
- Japan Society for the Promotion of Science (JSPS) [16107002, 20227001]
- Grants-in-Aid for Scientific Research [17084006, 20227001] Funding Source: KAKEN
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Chloroplasts change their positions in a cell in response to light intensities. The photoreceptors involved in chloroplast photo-relocation movements and the behavior of chloroplasts during their migration were identified in our previous studies, but the mechanism of movement has yet to be clarified. In this study, the behavior of actin filaments under various light conditions was observed in Adiantum capillus-veneris gametophytes. In chloroplasts staying in one place under a weak light condition and not moving, circular structures composed of actin filaments were observed around the chloroplast periphery. In contrast, short actin filaments were observed at the leading edge of moving chloroplasts induced by partial cell irradiation. In the dark, the circular structures found under the weak light condition disappeared and then reappeared around the moving chloroplasts. Mutant analyses revealed that the disappearance of the circular actin structure was mediated by the blue light photoreceptor, phototropin2.
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