Abstract
Chloroplasts alter their distribution within plant cells depending on the external light conditions. Myosin inhibitors 2,3-butanedione monoxime (BDM), N-ethylmaleimide (NEM), and 1-(5-iodonaphthalene-1-sulfonyl)-1H-hexahydro-1,4-diazepine hydrochloride (ML-7) were used to study the possible role of myosins in chloroplast photorelocation in Arabidopsis thaliana mesophyll cells. None of these agents had an effect on the chloroplast high-fluence-rate avoidance movement but all of the three myosin inhibitors blocked the accumulation movement of chloroplasts after a high-fluence-rate irradiation of the leaves. The results suggest that myosins have a role in A. thaliana chloroplast photorelocation.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Arabidopsis / cytology
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Arabidopsis / drug effects
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Arabidopsis / metabolism*
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Azepines / pharmacology
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Cell Polarity / drug effects
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Cell Polarity / physiology
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Chloroplasts / drug effects
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Chloroplasts / metabolism*
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Chloroplasts / ultrastructure
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Cytoplasmic Streaming / drug effects
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Cytoplasmic Streaming / physiology
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Diacetyl / analogs & derivatives
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Diacetyl / pharmacology
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Enzyme Inhibitors / pharmacology
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Ethylmaleimide / pharmacology
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Light
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Myosins / antagonists & inhibitors
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Myosins / metabolism*
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Naphthalenes / pharmacology
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Photic Stimulation
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Photosynthesis / drug effects
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Photosynthesis / physiology*
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Plant Epidermis / cytology
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Plant Epidermis / drug effects
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Plant Epidermis / metabolism*
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Plant Leaves / cytology
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Plant Leaves / drug effects
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Plant Leaves / metabolism*
Substances
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Azepines
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Enzyme Inhibitors
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Naphthalenes
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ML 7
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diacetylmonoxime
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Myosins
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Diacetyl
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Ethylmaleimide