Promotion of respiration by auxin in the induction of cell division in suspension culture

Leonova, L. A.; Gamburg, K. Z.; Vojnikov, V.; Varakina, N. N.

doi:10.1007/bf02266954

Cited by 13 publications

(8 citation statements)

References 11 publications

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“…It could be argued that our observation relates to an indirect effect of the impeded respiration post-cyanide treatment on auxin biosynthesis. Interestingly, a report on other respiration inhibitors (monoiodoacetate, malonate and 2,4-dinitrophenol) shows elimination of the auxin effect on respiration and cell division [61]. Based on previous studies and our findings, it can be concluded that promotion of respiration is a common auxin effect in plants [61] and impeding auxin biosynthesis could lead to respiration inhibition and cell death.…”

Section: Discussionsupporting

confidence: 72%

“…Interestingly, a report on other respiration inhibitors (monoiodoacetate, malonate and 2,4-dinitrophenol) shows elimination of the auxin effect on respiration and cell division [61]. Based on previous studies and our findings, it can be concluded that promotion of respiration is a common auxin effect in plants [61] and impeding auxin biosynthesis could lead to respiration inhibition and cell death. In the future, it would be interesting to study the relationship between cyanide-mediated suppression of auxin induced gene expression and the reported mechanism of cyanide mediated inhibition of mitochondrial respiration [62].…”

Section: Discussionsupporting

confidence: 72%

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Cyanogenic Pseudomonads Influence Multitrophic Interactions in the Rhizosphere

et al. 2008

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In the rhizosphere, plant roots cope with both pathogenic and beneficial bacterial interactions. The exometabolite production in certain bacterial species may regulate root growth and other root-microbe interactions in the rhizosphere. Here, we elucidated the role of cyanide production in pseudomonad virulence affecting plant root growth and other rhizospheric processes. Exposure of Arabidopsis thaliana Col-0 seedlings to both direct (with KCN) and indirect forms of cyanide from different pseudomonad strains caused significant inhibition of primary root growth. Further, we report that this growth inhibition was caused by the suppression of an auxin responsive gene, specifically at the root tip region by pseudomonad cyanogenesis. Additionally, pseudomonad cyanogenesis also affected other beneficial rhizospheric processes such as Bacillus subtilis colonization by biofilm formation on A. thaliana Col-0 roots. The effect of cyanogenesis on B. subtilis biofilm formation was further established by the down regulation of important B. subtilis biofilm operons epsA and yqxM. Our results show, the functional significance of pseudomonad cyanogenesis in regulating multitrophic rhizospheric interactions.

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Section: Discussionsupporting

confidence: 72%

Section: Discussionsupporting

confidence: 72%

Cyanogenic Pseudomonads Influence Multitrophic Interactions in the Rhizosphere

et al. 2008

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“…Intracellular H 2 O 2 in SHS exposed cells did not differ from the control cells, showing a transient increase at the beginning of the exponential phase (Fig. B), that could be explained by a more active oxidative metabolism in this growth phase where most of the cells are actively dividing (Leonova et al , de Pinto et al ). In contrast, in LHS‐exposed cells, intracellular H 2 O 2 did not show a transient increase in the exponential phase, as observed in the control cells, and its content was lower than in the control cells after 3 days of culture.…”

Section: Resultsmentioning

confidence: 91%

Changes in antioxidants are critical in determining cell responses to short‐ and long‐term heat stress

Sgobba

Paradiso

Dipierro

et al. 2014

Physiologia Plantarum

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Heat stress can have deleterious effects on plant growth by impairing several physiological processes. Plants have several defense mechanisms that enable them to cope with high temperatures. The synthesis and accumulation of heat shock proteins (HSPs), as well as the maintenance of an opportune redox balance play key roles in conferring thermotolerance to plants. In this study changes in redox parameters, the activity and/or expression of reactive oxygen species (ROS) scavenging enzymes and the expression of two HSPs were studied in tobacco Bright Yellow-2 (TBY-2) cells subjected to moderate short-term heat stress (SHS) and long-term heat stress (LHS). The results indicate that TBY-2 cells subjected to SHS suddenly and transiently enhance antioxidant systems, thus maintaining redox homeostasis and avoiding oxidative damage. The simultaneous increase in HSPs overcomes the SHS and maintains the metabolic functionality of cells. In contrast the exposure of cells to LHS significantly reduces cell growth and increases cell death. In the first phase of LHS, cells enhance antioxidant systems to prevent the formation of an oxidizing environment. Under prolonged heat stress, the antioxidant systems, and particularly the enzymatic ones, are inactivated. As a consequence, an increase in H2 O2 , lipid peroxidation and protein oxidation occurs. This establishment of oxidative stress could be responsible for the increased cell death. The rescue of cell growth and cell viability, observed when TBY-2 cells were pretreated with galactone-γ-lactone, the last precursor of ascorbate, and glutathione before exposure to LHS, highlights the crucial role of antioxidants in the acquisition of basal thermotolerance.

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“…The major mechanism by which auxin affects cellular responses is via changes in transcription, and thus, several genes change their expression profile rapidly in response to auxin (Paponov et al, 2008). In addition, auxin is able to promote cell division in cultured cellular suspensions, which is accompanied by increased respiration (Leonova et al, 1985). It has been suggested that stimulation of cell expansion is usually accompanied by the promotion of respiration (Bonner & Bandurski, 1952).…”

Section: Photosynthetic Capacity and Metabolism Adjustments In Respmentioning

confidence: 99%

“…Recent compelling evidence has shown that plant hormones can regulate networks affecting mitochondrial metabolism (Berkowitz et al, ). Interestingly, it has previously been suggested that auxin regulates mitochondrial respiration to meet the increased energy demand for growing cells (Leonova, Gamburg, Vojnikov, & Varakina, ). Although the role of auxin in controlling plant growth and development is well established, our understanding on the connections between auxin and primary metabolism remains limited.…”

Section: Introductionmentioning

confidence: 99%

Modulation of auxin signalling through DIAGETROPICA and ENTIRE differentially affects tomato plant growth via changes in photosynthetic and mitochondrial metabolism

Batista‐Silva

Medeiros

Rodrigues-Salvador

et al. 2018

Plant Cell & Environment

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Auxin modulates a range of plant developmental processes including embryogenesis, organogenesis, and shoot and root development. Recent studies have shown that plant hormones also strongly influence metabolic networks, which results in altered growth phenotypes. Modulating auxin signalling pathways may therefore provide an opportunity to alter crop performance. Here, we performed a detailed physiological and metabolic characterization of tomato (Solanum lycopersicum) mutants with either increased (entire) or reduced (diageotropica-dgt) auxin signalling to investigate the consequences of altered auxin signalling on photosynthesis, water use, and primary metabolism. We show that reduced auxin sensitivity in dgt led to anatomical and physiological modifications, including altered stomatal distribution along the leaf blade and reduced stomatal conductance, resulting in clear reductions in both photosynthesis and water loss in detached leaves. By contrast, plants with higher auxin sensitivity (entire) increased the photosynthetic capacity, as deduced by higher V and J coupled with reduced stomatal limitation. Remarkably, our results demonstrate that auxin-sensitive mutants (dgt) are characterized by impairments in the usage of starch that led to lower growth, most likely associated with decreased respiration. Collectively, our findings suggest that mutations in different components of the auxin signalling pathway specifically modulate photosynthetic and respiratory processes.

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Promotion of respiration by auxin in the induction of cell division in suspension culture

Cited by 13 publications

References 11 publications

Cyanogenic Pseudomonads Influence Multitrophic Interactions in the Rhizosphere

Cyanogenic Pseudomonads Influence Multitrophic Interactions in the Rhizosphere

Changes in antioxidants are critical in determining cell responses to short‐ and long‐term heat stress

Modulation of auxin signalling through DIAGETROPICA and ENTIRE differentially affects tomato plant growth via changes in photosynthetic and mitochondrial metabolism

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