Specificity and integration of responses: Ca2+ as a signal in polarity and osmotic regulation

Brownlee, Colin; Goddard, Helen; Hetherington, Alistair M.; Peake, L. A.

doi:10.1093/jxb/50.special_issue.1001

Cited by 23 publications

(13 citation statements)

References 68 publications

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“…The Ca 2ϩ signal at the rhizoid apex is essential for turgor and volume regulation (13) and probably involves the regulation of ion channels that allow osmoregulatory ion efflux (24). Polarized growth requires localized Ca 2ϩ elevation, transduced via Ca 2ϩ ͞calmodulin (25,26), regulation of targeted exocytosis (27), and a functional cytoskeleton (28).…”

Section: Resultsmentioning

confidence: 99%

Elemental propagation of calcium signals in response-specific patterns determined by environmental stimulus strength

Goddard

Manison

Tomos

et al. 2000

Proc. Natl. Acad. Sci. U.S.A.

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Section: Resultsmentioning

confidence: 99%

Elemental propagation of calcium signals in response-specific patterns determined by environmental stimulus strength

Goddard

Manison

Tomos

et al. 2000

Proc. Natl. Acad. Sci. U.S.A.

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“…It is well documented that the plant cells responding to osmotic stress display rapid transient elevations in cytosolic Ca 2+ concentration (Knight et al. , 1991, 1997, 1998; Brownlee et al. , 1999).…”

Section: Discussionmentioning

confidence: 99%

Altered patterns of tubulin polymerization in dividing leaf cells of Chlorophyton comosum after a hyperosmotic treatment

2001

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Summary• Microtubule organization and tubulin polymerization in meristematic leaf cells of Chlorophyton comosum treated with an aqueous solution of 1 M mannitol, inducing plasmolysis, were examined with immunofluorescence and transmission electron microscopy.• Hyperosmotic treatment induced disintegration of the interphase microtubule systems. Free tubulin, either liberated from the depolymerized microtubules or preexisting as a nonassembled pool, was incorporated into a network of paracrystals. In most of the dividing cells, mitotic and cytokinetic microtubule systems were replaced by atypical spindle-like structures displaying bipolarity and atypical phragmoplasts, respectively. These atypical mitotic and cytokinetic structures consisted of large densely packed bundles of macrotubules (32 nm diameter) or macrotubules and paracrystals. Tubulin paracrystals also occurred in ectopic positions in plasmolysed mitotic and cytokinetic cells. Dividing cells displaying paracrystals only did not form atypical mitotic and cytokinetic apparatuses.• Short hyperosmotic stress causes disintegration of all microtubule arrays in dividing cells of C. comosum . Free tubulin is incorporated into macrotubules and tubulin paracrystals. The latter exhibit definite periodicity and characteristic fine structure.

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“…It is now generally recognised that the creation of distinct spatio-temporal Ca 2 pro¢les within cellular microdomains is utilised by mammalian cells to distinguish between both the nature and intensity of a wide range of cellular stimuli [21] and, as has recently been pointed out by several researchers, a similar situation is likely to exist in plant cells [22,23]. It is thus an attractive hypothesis that the ability to distinguish between salt and hyperosmotic stress somehow is encoded by the Ins(1,4,5)P 3 production shown in the present study and the Ca 2 transduction pathways previously identi¢ed [3,18].…”

Section: E¡ect Of Nacl On the In Vitro Activity Of Phospholipase Cmentioning

confidence: 96%

Inositol(1,4,5)trisphosphate production in plant cells: an early response to salinity and hyperosmotic stress

Drøbak

Watkins

2000

FEBS Letters

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Salinity and hyperosmotic stress are environmental factors that severely affect the growth and development of plants. Adaptation to these stresses is known to be a complex multistep process, but a rise in cytoplasmic Ca 2+ and increased polyphosphoinositide turnover have now been identified as being amongst the early events leading to the development of tolerance. To determine whether a causal link exists between these two events we have investigated the effects of several salts and osmotic agents on levels of inositol(1,4,5)trisphosphate (Ins(1,4,5)P 3 ) in plant cells. Our data show that salts as well as osmotic agents induce a rapid and up to 15-fold increase in cellular Ins(1,4,5)P 3 levels. The increase in Ins(1,4,5)P 3 occurs in a dose-dependent manner and levels remain elevated for at least 10 min. These data indicate that increased Ins(1,4,5)P 3 production is a common response to salt and hyperosmotic stresses in plants and that it may play an important role in the processes leading to stress tolerance. ß

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Specificity and integration of responses: Ca2+ as a signal in polarity and osmotic regulation

Cited by 23 publications

References 68 publications

Elemental propagation of calcium signals in response-specific patterns determined by environmental stimulus strength

Elemental propagation of calcium signals in response-specific patterns determined by environmental stimulus strength

Altered patterns of tubulin polymerization in dividing leaf cells of Chlorophyton comosum after a hyperosmotic treatment

Inositol(1,4,5)trisphosphate production in plant cells: an early response to salinity and hyperosmotic stress

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