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• W2064202284 startingPage "1031" @default.
• W2064202284 abstract "Gravitropically tip-growing cell types are attractive unicellular model systems for investigating the mechanisms and the regulation of gravitropism. Especially useful for studying the mechanisms of positive and negative gravitropic tip-growth are characean rhizoids and protonemata. They originate from the same cell type, show the same overall cell shape, cytoplasmic zonation, arrangement of actin and microtubule cytoskeleton, use statoliths for gravisensing, but show opposite gravitropism. In both cell types, actin microfilaments are complexly organized in the apical dome, where a dense spherical actin array is colocalized with spectrin-like epitopes and a unique endoplasmic reticulum aggregate, the structural center of the Spitzenkörper. The opposite gravitropic responses seem to be based on differences in the actin-organized anchorage of the Spitzenkörper and the actin-mediated transport of statoliths. In negatively gravitropic (upward bending) protonemata, the statoliths-induced drastic upward shift of the cell tip is preceded by a relocalization of dihydropyridine-binding calcium channels and of the apical calcium gradient to the upper flank (bending by bulging). Such relocalizations have not been observed in positively gravitropically responding (downward growing) rhizoids in which statoliths sedimentation is followed by differential flank growth (bending by bowing). This paper reviews the current knowledge and hypotheses on the mechanisms of the opposite gravitropic responses in characean rhizoids and protonemata." @default.
• W2064202284 created "2016-06-24" @default.
• W2064202284 creator A5040526557 @default.
• W2064202284 date "2001-01-01" @default.
• W2064202284 modified "2023-09-27" @default.
• W2064202284 title "Gravisensing in single-celled systems: characean rhizoids and protonemata" @default.
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• W2064202284 doi "https://doi.org/10.1016/s0273-1177(01)00180-6" @default.
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• W2064202284 hasPublicationYear "2001" @default.
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