Critical consideration on the relationship between auxin transport and calcium transients in gravity perception of Arabidopsis seedlings

Toyota, Masatsugu; Furuichi, Teiichi; Tatsumi, Hitoshi; Sokabe, Masahiro

doi:10.4161/psb.3.8.6339

Cited by 27 publications

(17 citation statements)

References 40 publications

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“…However, the effect of calcium on rapid gravity-dependent PIN3 relocalization is unknown. Calcium may therefore be assumed to be upstream of auxin in gravity signalling, but pharmacological studies suggest that the first peak of the calcium response in stems and the plateau of the second response are both auxin-transport dependent (Toyota et al 2008a). Calcium chelator-induced loss of root gravitropism was compromised in ACS7 (key ethylene biosynthesis enzyme) mutant, suggesting that ACS7 is involved in gravitropism downstream to calcium (Huang et al 2013).…”

Section: Calciummentioning

confidence: 98%

Molecular mechanisms of gravity perception and signal transduction in plants

et al. 2015

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Gravity is one of the environmental cues that direct plant growth and development. Recent investigations of different gravity signalling pathways have added complexity to how we think gravity is perceived. Particular cells within specific organs or tissues perceive gravity stimulus. Many downstream signalling events transmit the perceived information into subcellular, biochemical, and genomic responses. They are rapid, non-genomic, regulatory, and cell-specific. The chain of events may pass by signalling lipids, the cytoskeleton, intracellular calcium levels, protein phosphorylation-dependent pathways, proteome changes, membrane transport, vacuolar biogenesis mechanisms, or nuclear events. These events culminate in changes in gene expression and auxin lateral redistribution in gravity response sites. The possible integration of these signalling events with amyloplast movements or with other perception mechanisms is discussed. Further investigation is needed to understand how plants coordinate mechanisms and signals to sense this important physical factor.

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Section: Calciummentioning

confidence: 98%

Molecular mechanisms of gravity perception and signal transduction in plants

et al. 2015

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“…We show that Ca 2+ level modifiers significantly reduced PIN1 gene expression but at the same time inhibited basal localization of the protein in the cell. It is well known that Ca 2+ is involved in vesicle transport (Toyata et al 2008;Tanaka et al 2010). Gravity induces PIN transcytosis (Kleine-Vehn et al 2010), and the gravity-induced PIN protein movement is closely related to Ca 2+ oscillation (Toyata et al 2008).…”

Section: Discussionmentioning

confidence: 99%

“…The dynamic interplay between calcium signatures and Ca 2+ binding proteins contributes to the stimulus-specificity of Ca 2+ signaling. It is well known that changes in Ca 2+ concentration can elicit several physiological and developmental responses in plants such as gravitropism (Toyata et al 2008), root nodulation by Nod factor (Hirsh et al 2009), closure of stomata (Geiger et al 2011), pollen-stigma interaction (Sirová et al 2011), cold signaling (Kim 2007), and root growth (Zhao et al 2010).…”

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confidence: 99%

Calcium Could Be Involved in Auxin-Regulated Maintenance of the Quiescent Center in the Arabidopsis Root

2012

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Ca 2+ transduces hormone and environmental signals to the Ca 2+ sensors and relays them to the downstream target effectors in cells. During the post-embryonic developmental process, auxin plays a critical role in maintaining the mitotically inactive status of the quiescent center (QC) and the root growth and development that follows. In this report, we demonstrate that Ca 2+ plays an important role in the maintenance of the QC, probably by regulating PIN1-mediated auxin transport. Perturbation of the intracellular Ca 2+ levels with chemicals that modify the Ca 2+ level decreases the endogenous auxin level and the size of the auxin maximum in the root tip and, at the same time, activates QC cell division and expansion. This decreased level of auxin is almost completely restored to the control level by the treatment of exogenous auxin. Interestingly, treatment with Ca 2+ level modifying chemicals significantly decreased the PIN1 expression in the root vasculature. Taken together, we suggest that balancing Ca 2+ homeostasis is one of contributing factors in establishing the proper auxin maximum in the root tip and maintaining the QC identity.

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“…8 Changes in the [Ca 2+ ] c induced by gravistimulation have been studied in more detail in Arabidopsis (Arabidopsis thaliana) seedlings expressing the luminous Ca 2+ -reporting protein, apoaequorin. [9][10][11] When the seedlings were gravistimulated by turning 180°, they show a transient biphasic [Ca 2+ ] c -increase in their hypocotyls and petioles; 9 a fast transient and a following slow [Ca 2+ ] c -increases. These two Ca 2+ changes have different characteristics.…”

Section: Introductionmentioning

confidence: 99%