Action Spectrum for Light-induced Chloroplast Accumulation in a Marine Coenocytic Green Alga, Bryopsis plumosa
Abstract
A marine coenocytic green alga, Bryopsis plumosa exhibited multistriate type protoplasmic streaming of a velocity less than 100 μm.min−1. When the alga was illuminated locally, chloroplasts and other cell organelles accumulated in the illuminated zone. The action spectrum for this reaction showed that blue light between 380 and 500 nm was most effective. The velocity of chloroplast movement decreased when the cell was totally illuminated with blue light, but no comparable change was observed under red light illumination. Therefore, chloroplast accumulation probably was caused by the reduced streaming rate in the illuminated zone. Electron microscopy showed cytoplasmic microtubules arranged parallel to the cell axis in the vicinity of the chloroplasts. Chloroplast movement was inhibited heavily by treatment with antimicrotubule agents, but was little affected by cytochalasin B at a concentration of 10 μg/ml.
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Actin appears dispensable for chloroplast motility in at least some Bryopsis strains.
“In land plants, actin generally plays a dominant role in organelle transport; however, a kinesin‐like protein (KAC), which is critical for actin‐based chloroplast motility in land plants, is absent from the Bryopsis genome, and actin appears to be dispensable for chloroplast motility, at least in some Bryopsis strains (Mizukami & Wada, 1981; Ochiai et al., 2024; Suetsugu et al., 2010).”
From <scp>RNAi</scp> reveals a unique set of kinesins mediating chloroplast motility in the giant cytoplasm of <i>Bryopsis</i> (Ulvophyceae), a coenocytic green alga (2026) · cites this paper as Mizukami & Wada, 1981
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Poff, K. L., & Hong, C. B. (1982) · Photochemistry and Photobiology · doi:10.1111/j.1751-1097.1982.tb09499.x · Cited by 4 · see citing works
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- Authors
- Mizukami, M., & Wada, S.
- Affiliations
- Tohoku University (JP)
- Venue
- Plant and Cell Physiology
- Publisher
- Oxford University Press (OUP)
- Published
- 1981-11
- ISSN
- 0032-0781 (ISSN-L)
- 1471-9053
- OpenAlex
- W1959995304
- Cited by
- 26
- References
- 0
- Citations by year
- 2025: 1 · 2016: 1 · 2015: 1
- FWCI
- 1.80
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Plant and Cell Physiology (publishedVersion)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Light effects on plants
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Photosynthetic Processes and Mechanisms
- Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal plant biology
- Keywords
- Bryopsis plumosa, cytoplasmic streaming, action spectrum, blue light, red light, microtubules, microtubule inhibitors, cytochalasin B, chloroplast movement, marine green algae
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