Extracellular superoxide production associated with secondary root growth following desiccation of Pisum sativum seedlings

Roach, Thomas; Kranner, Ilse

doi:10.1016/j.jplph.2011.04.010

Cited by 12 publications

(11 citation statements)

References 26 publications

(27 reference statements)

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“…Ca 2+ influx via AtANN1 could form a positive feedback, causing Ca 2+ -dependent activation of AtRBOHC (Takeda et al, 2008) to maintain AtSOS1 stability. Secondary root growth involves superoxide anion production, possibly by NADPH oxidases (Roach and Kranner, 2011). The involvement of these enzymes Figure 6.…”

Section: +mentioning

confidence: 99%

“…Reactive oxygen species (ROS), sourced from plasma membrane NADPH oxidase activity, help stabilize AtSOS1 transcripts (Chung et al, 2008). Growth of better-adapted secondary roots is impaired in Atsos1 (Huh et al, 2002) and involves superoxide anion production, possibly by NADPH oxidases (Roach and Kranner, 2011). These enzymes are now known to play a role in xylem loading of Na + (Jiang et al, 2012).…”

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confidence: 99%

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Salinity-Induced Calcium Signaling and Root Adaptation in Arabidopsis Require the Calcium Regulatory Protein Annexin1

et al. 2013

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Salinity (NaCl) stress impairs plant growth and inflicts severe crop losses. In roots, increasing extracellular NaCl causes Ca2+ influx to elevate cytosolic free Ca2+ ([Ca2+]cyt) as a second messenger for adaptive signaling. Amplification of the signal involves plasma membrane reduced nicotinamide adenine dinucleotide phosphate oxidase activation, with the resultant reactive oxygen species triggering Ca2+ influx. The genetic identities of the Ca2+-permeable channels involved in generating the [Ca2+]cyt signal are unknown. Potential candidates in the model plant Arabidopsis (Arabidopsis thaliana) include annexin1 (AtANN1). Here, luminescent detection of [Ca2+]cyt showed that AtANN1 responds to high extracellular NaCl by mediating reactive oxygen species-activated Ca2+ influx across the plasma membrane of root epidermal protoplasts. Electrophysiological analysis revealed that root epidermal plasma membrane Ca2+ influx currents activated by NaCl are absent from the Atann1 loss-of-function mutant. Both adaptive signaling and salt-responsive production of secondary roots are impaired in the loss-of-function mutant, thus identifying AtANN1 as a key component of root cell adaptation to salinity.

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Section: +mentioning

confidence: 99%

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confidence: 99%

Salinity-Induced Calcium Signaling and Root Adaptation in Arabidopsis Require the Calcium Regulatory Protein Annexin1

et al. 2013

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“…The signaling effect of galactinol and RFOs (Keunen et al 2013) seems to be related to the formation of reactive oxygen species (ROS) in tissues exposed to a broad range of abiotic stresses (Rosenwasser et al 2013). The production of extracellular ROS during pea seed germination and seedling development (Kranner et al 2010) is accelerated during seedling desiccation (Roach and Kranner 2011. It cannot be excluded that galactinol, raffinose and stachyose act as antioxidants Nishizawa-Yokoi et al 2008).…”

Section: Accumulation Of Galactinol and Rfosmentioning

confidence: 99%

Osmotic stress induces genes, enzymes and accumulation of galactinol, raffinose and stachyose in seedlings of pea (Pisum sativum L.)

et al. 2015

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The objective of the present study was to recognize the molecular background of the accumulation of raffinose family oligosaccharides (RFOs) in pea (Pisum sativum L.) seedlings under osmotic stress conditions. The exposure of 5-day-old pea seedlings to osmotic stress for 48 h created by immersing roots in PEG8000 solution (-1.5 MPa) induced synthesis of galactinol and RFOs (raffinose and stachyose) in the epicotyl and root tissues, but not in cotyledons. After 24 h of recovery, galactinol completely disappeared, raffinose decreased fourfold and stachyose decreased twofold in roots, but increased in epicotyls. The temporary accumulation of RFOs resulted from a dramatic increase in the enzymatic activity and changes in expression of galactinol synthase (PsGolS), raffinose synthase (PsRS) and stachyose synthase (PsSTS) genes. PsGolS was induced by osmotic stress in both epicotyls as well as in roots. PsRS and PsSTS were induced only in epicotyls, but repressed or remained unaffected in roots, respectively. During recovery, the expression and activity of PsGolS, PsRS and PsSTS dramatically decreased. The expression of PsGolS gene, that level of mRNA transcript significantly decreased during recovery and whose promoter region was identified to contain some stress-related regulating elements, seems to play a crucial role in the biosynthesis of RFOs under osmotic stress. Possible signals that may trigger the induction of expression of PsGolS, PsRS and PsSTS genes and accumulation of RFOs in pea seedlings are discussed.

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“…Compounds involved in primary metabolism also are important precursors of stress related compounds, such as phenylpropanoids, flavonoids and proteins (Dixon and Pavia, 1995). A second role of primary metabolites during plant stress is the mitigation of oxidative stress (Shen et al, 1997;Taji et al, 2002) due to the formation of reactive oxygen species in roots in response to desiccation (Roach and Kranner, 2011). Water deficits decrease the uptake of nutrients from the soil and impede the distribution of nutrients within the plant via the transpiration stream (Taylor et al, 1982).…”

Section: Introductionmentioning

confidence: 99%

Responses of growth and primary metabolism of water-stressed barley roots to rehydration

Sicher

Timlin

Bailey

2012

Journal of Plant Physiology

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Extracellular superoxide production associated with secondary root growth following desiccation of Pisum sativum seedlings

Cited by 12 publications

References 26 publications

Salinity-Induced Calcium Signaling and Root Adaptation in Arabidopsis Require the Calcium Regulatory Protein Annexin1

Salinity-Induced Calcium Signaling and Root Adaptation in Arabidopsis Require the Calcium Regulatory Protein Annexin1

Osmotic stress induces genes, enzymes and accumulation of galactinol, raffinose and stachyose in seedlings of pea (Pisum sativum L.)

Responses of growth and primary metabolism of water-stressed barley roots to rehydration

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