Gravity-directed calcium current in germinating spores of Ceratopteris richardii
Gravity-directed calcium current in germinating spores of Ceratopteris richardii
Gravity directs the early polar development in single cells of Ceratopteris richardii Brogn. It acts over a limited period of time during which it irreversibly determines the axis of the spore cell's development. A self-referencing calcium selective electrode was utilized to record the net movement of calcium across the cell membrane at different positions around the periphery of the spore during the period in which gravity orients the polarity of the spore. A movement of calcium into the cell along the bottom and out of the cell along the top was detected. This movement was specific, polarized, and strongest in a direction that opposed the vector of gravity. Treatment with nifedipine, a calcium-channel blocker, diminished the calcium current and caused the cell to lose its responsiveness to the orienting influence of gravity. Results shown suggest that calcium plays a crucial role in the ability of a single cell to respond to gravity and in the subsequent establishment of its polarity.
calcium –ceratopteris (ca, gravity), developmental polarity, gravity, ion current, nifedipine
607-610
Chatterjee, Ani
18db3ca4-e6e9-4661-bd6f-31b460af7772
Marshall Porterfield, D.
f2ef48bb-913b-43b0-a10f-957ffad92844
Smith, Peter S.
003de469-9420-4f12-8f0e-8e8d76d28d6c
Roux, Stanley J.
e046a8b6-0996-4e28-8de4-43cfaaf5754d
2000
Chatterjee, Ani
18db3ca4-e6e9-4661-bd6f-31b460af7772
Marshall Porterfield, D.
f2ef48bb-913b-43b0-a10f-957ffad92844
Smith, Peter S.
003de469-9420-4f12-8f0e-8e8d76d28d6c
Roux, Stanley J.
e046a8b6-0996-4e28-8de4-43cfaaf5754d
Chatterjee, Ani, Marshall Porterfield, D., Smith, Peter S. and Roux, Stanley J.
(2000)
Gravity-directed calcium current in germinating spores of Ceratopteris richardii.
Planta, 210 (4), .
(doi:10.1007/s004250050050).
Abstract
Gravity directs the early polar development in single cells of Ceratopteris richardii Brogn. It acts over a limited period of time during which it irreversibly determines the axis of the spore cell's development. A self-referencing calcium selective electrode was utilized to record the net movement of calcium across the cell membrane at different positions around the periphery of the spore during the period in which gravity orients the polarity of the spore. A movement of calcium into the cell along the bottom and out of the cell along the top was detected. This movement was specific, polarized, and strongest in a direction that opposed the vector of gravity. Treatment with nifedipine, a calcium-channel blocker, diminished the calcium current and caused the cell to lose its responsiveness to the orienting influence of gravity. Results shown suggest that calcium plays a crucial role in the ability of a single cell to respond to gravity and in the subsequent establishment of its polarity.
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Published date: 2000
Keywords:
calcium –ceratopteris (ca, gravity), developmental polarity, gravity, ion current, nifedipine
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Local EPrints ID: 190603
URI: http://eprints.soton.ac.uk/id/eprint/190603
ISSN: 0032-0935
PURE UUID: 430f572d-4dfc-431f-a38d-779210b6c2f7
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Date deposited: 17 Jun 2011 13:08
Last modified: 15 Mar 2024 03:39
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Author:
Ani Chatterjee
Author:
D. Marshall Porterfield
Author:
Stanley J. Roux
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