Redox Regulation of Plant Development

Considine, Michael J.; Foyer, Christine H.

doi:10.1089/ars.2013.5665

Cited by 241 publications

(184 citation statements)

References 201 publications

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“…It is thus likely that growing shoot tissues and meristems exhibit anoxic conditions: multiple reports have shown a relationship between ROS levels and root development, but less attention has been dedicated to the link between ROS levels and shoot meristematic functions. However, work in perennial species had suggested that bud break after winter dormancy is associated with strong increases in ROS levels (Considine and Foyer, 2014). We explored the similarities between dormancy and GPA: gene expression changes from growing to arrested meristems and vice versa are consistent with the idea that GPA represents a shoot dormancy.…”

Section: Discussionmentioning

confidence: 80%

“…To our knowledge, such extreme differences in ROS levels have not been described in Arabidopsis inflorescences upon growth transitions. Instead, they are reminiscent of effects previously described in transitions in to and out of bud dormancy in other species, such as kiwifruit, grapevine, and poplar (Considine and Foyer, 2014).…”

Section: Gpa Is Associated With Responses To Stress and To Growth-inhmentioning

confidence: 81%

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Seed Production Affects Maternal Growth and Senescence in Arabidopsis

Wuest

Philipp²,

Guthörl³

et al. 2016

Plant Physiol.

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Correlative control (influence of one organ over another organ) of seeds over maternal growth is one of the most obvious phenotypic expressions of the trade-off between growth and reproduction. However, the underlying molecular mechanisms are largely unknown. Here, we characterize the physiological and molecular effects of correlative inhibition by seeds on Arabidopsis (Arabidopsis thaliana) inflorescences, i.e. global proliferative arrest (GPA) during which all maternal growth ceases upon the production of a given number of seeds. We observed transcriptional responses to growth-and branching-inhibitory hormones, and low mitotic activity in meristems upon GPA, but found that meristems retain their identity and proliferative potential. In shoot tissues, we detected the induction of stress-and senescence-related gene expression upon fruit production and GPA, and a drop in chlorophyll levels, suggestive of altered source-sink relationships between vegetative shoot and reproductive tissues. Levels of shoot reactive oxygen species, however, strongly decreased upon GPA, a phenomenon that is associated with bud dormancy in some perennials. Indeed, gene expression changes in arrested apical inflorescences after fruit removal resembled changes observed in axillary buds following release from apical dominance. This suggests that GPA represents a form of bud dormancy, and that dominance is gradually transferred from growing inflorescences to maturing seeds, allowing offspring control over maternal resources, simultaneously restricting offspring number. This would provide a mechanistic explanation for the constraint between offspring quality and quantity.

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Section: Discussionmentioning

confidence: 80%

Section: Gpa Is Associated With Responses To Stress and To Growth-inhmentioning

confidence: 81%

Seed Production Affects Maternal Growth and Senescence in Arabidopsis

Wuest

Philipp²,

Guthörl³

et al. 2016

Plant Physiol.

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“…The subsequent question that arises is how this regulation is mediated. It was discussed previously that hypoxiamediated changes in the redox status of the cell could be involved in regulating low-oxygen stress responses (Considine and Foyer, 2014). Although it is not possible to fully answer the question of how the tricarboxylic acid cycle is controlled upon hypoxia with our current experimental data, our results provide interesting indications that give rise to the hypothesis that redox-mediated control of the tricarboxylic acid cycle might be involved.…”

Section: Hypoxia Leads To the Inhibition Of Sdh And Concomitantly Of mentioning

confidence: 99%

Regulation of Primary Metabolism in Response to Low Oxygen Availability as Revealed by Carbon and Nitrogen Isotope Redistribution

et al. 2015

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Based on enzyme activity assays and metabolic responses to waterlogging of the legume Lotus japonicus, it was previously suggested that, during hypoxia, the tricarboxylic acid cycle switches to a noncyclic operation mode. Hypotheses were postulated to explain the alternative metabolic pathways involved, but as yet, a direct analysis of the relative redistribution of label through the corresponding pathways was not made. Here, we describe the use of stable isotope-labeling experiments for studying metabolism under hypoxia using wild-type roots of the crop legume soybean (Glycine max). [ 13 C]Pyruvate labeling was performed to compare metabolism through the tricarboxylic acid cycle, fermentation, alanine metabolism, and the g-aminobutyric acid shunt, while [ 13 C]glutamate and [ 15 N]ammonium labeling were performed to address the metabolism via glutamate to succinate. Following these labelings, the time course for the redistribution of the 13 C/ 15 N label throughout the metabolic network was evaluated with gas chromatography-time of flight-mass spectrometry. Our combined labeling data suggest the inhibition of the tricarboxylic acid cycle enzyme succinate dehydrogenase, also known as complex II of the mitochondrial electron transport chain, providing support for the bifurcation of the cycle and the down-regulation of the rate of respiration measured during hypoxic stress. Moreover, up-regulation of the g-aminobutyric acid shunt and alanine metabolism explained the accumulation of succinate and alanine during hypoxia.

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“…A loss of dehydration tolerance on the fifth day following imbibition is accompanied by a higher AsA content and AsA/DHA ratio in 6-day-old seedlings compared to 4-day-old seedlings. The higher AsA content may be because of the de novo biosynthesis of AsA required for both cell division and expansion (Considine and Foyer 2014) and a higher AsA recycling ability. In response to water deficiency, seedlings resistant to dehydration demonstrated a steady reduced status of ascorbate because of the paralleled increase in DHA and AsA.…”

Section: Discussionmentioning

confidence: 99%

“…The differential response of ascorbate and glutathione to environmental factors illustrates the specific and distinct roles played by AsA and GSH within plants. AsA regulates primarily plant development and GSH is involved in plant development and in stress defence and signalling (Considine and Foyer 2014).…”

Section: Discussionmentioning

confidence: 99%

Changes in the reduction state of ascorbate and glutathione, protein oxidation and hydrolysis leading to the development of dehydration intolerance in Triticum aestivum L. seedlings

2015

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The present work demonstrates that the transition of wheat (Triticum aestivum L.) seedlings from dehydration tolerance to intolerance on the fifth day following imbibition is associated with a disturbance in cellular redox homeostasis. During germination the ratio of reduced (AsA) to oxidized ascorbate (DHA) was lower in the tolerant 4-day-old seedlings compared to the sensitive 6-day-old seedlings because of the lower ascorbate content in the former. The reduced glutathione (GSH) and total glutathione (GSH ? GSSG) pools were higher in tolerant seedlings and remained higher upon dehydration. The development of dehydration intolerance with a seedling age coincided with a 50 % loss of the total glutathione pool and a shift of GSH/GSSG to a more oxidized state. Activities of ascorbate peroxidase and glutathione reductase increased with water deficiency in both tolerant and sensitive seedlings but the three new activity bands appeared only in sensitive seedlings. The stable ratio of GSH/GSSG and a higher AsA/DHA ratio in sensitive seedlings did not prevent the enhanced production of H2O2 and the peroxidation of lipids with dehydration. As a result, an increase in the protein carbonyl group and a significant decrease in the thiol groups were observed in dehydrated sensitive seedlings. Water deficiency enhanced the total azocaseinolytic activity, mainly in sensitive seedlings. The highest increase in protein carbonylation and lowest azocaseinolytic activity was observed at the beginning of seedling dehydration (15-25 % WSD) being in a sensitive phase of growth. The presented results indicate that the development of dehydration intolerance during the transition of wheat seedlings from heterotrophic to autotrophic growth is associated with an alterations in protein oxidation.

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Redox Regulation of Plant Development

Cited by 241 publications

References 201 publications

Seed Production Affects Maternal Growth and Senescence in Arabidopsis

Seed Production Affects Maternal Growth and Senescence in Arabidopsis

Regulation of Primary Metabolism in Response to Low Oxygen Availability as Revealed by Carbon and Nitrogen Isotope Redistribution

Changes in the reduction state of ascorbate and glutathione, protein oxidation and hydrolysis leading to the development of dehydration intolerance in Triticum aestivum L. seedlings

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