Plant growth regulators interact with elevated temperature to alter heat stress signaling via the Unfolded Protein Response in maize

Neill, Elena M.; Byrd, Michael C. R.; Billman, Thomas; Brandizzí, Federica; Stapleton, Ann E.

doi:10.1038/s41598-019-46839-9

Cited by 28 publications

(15 citation statements)

References 29 publications

(35 reference statements)

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“…ER stress elicits the unfolded protein response (UPR), a cytoprotective response to mitigate and to protect from this damage (Howell, 2013). The UPR is signaled through two pathways: one involving the proteolytic processing transcription factor bZIP28, and the other involving the ribonuclease IRE1, which mediates the splicing of the bZIP60 transcription factor mRNA (Neill et al, 2019). Both UPR pathways induce the expression of Heat Shock Proteins (HSPs) and activation of brassinosteroids (BRs) signaling (Che et al, 2010).…”

Section: Temperature Sensing and Signaling In Rootsmentioning

confidence: 99%

Root Growth Adaptation to Climate Change in Crops

et al. 2020

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Section: Temperature Sensing and Signaling In Rootsmentioning

confidence: 99%

Root Growth Adaptation to Climate Change in Crops

et al. 2020

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“…One such intervention for alleviating waterlogging stress is supplementation with a plant growth regulator (PGR). PGR are often used to increase plant productivity, tolerance to stress, and self-repair qualitatively similar to the physiological and biological effects of phytohormones (Ali et al, 2015;Neill et al, 2019). Studies have demonstrated that PGRs can significantly increase the efficiency of the AsA-GSH cycle by removing the oxidative damage caused by the accumulation of ROS induced by environmental stress.…”

Section: Introductionmentioning

confidence: 99%

Exogenous 6-Benzyladenine Improves Waterlogging Tolerance in Maize Seedlings by Mitigating Oxidative Stress and Upregulating the Ascorbate-Glutathione Cycle

Wang

Zhu

2021

Front. Plant Sci.

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The synthetic cytokinin 6-benzyladenine (6-BA) regulates plant growth and prevents the negative consequences of various forms of abiotic stress, including waterlogging in crop plants. The present study aimed to investigate the effects of exogenous 6-BA on the growth, oxidative stress, and ascorbate-glutathione (AsA-GSH) cycle system in the inbred SY-MY13 (waterlogging-resistant) and SY-XT1 (waterlogging-sensitive) seedlings of waxy corn in conditions of waterlogging stress. The results demonstrated that waterlogging stress causes chlorosis and necrosis in waxy corn leaves, inhibiting growth and leading to the accumulation of reactive oxygen species (ROS), which induces oxidative stress and, in turn, reduces membrane lipid peroxidation and the disruption of membrane homeostasis. This is specifically manifested in the increased concentrations of superoxide anion radicals (O2-), hydrogen peroxide (H2O2), and malondialdehyde (MDA), in addition to increased relative electrical conductivity (REC%) values. The SY-MY13 strain exhibited growth superior to that of SY-XT1 when waterlogged due to its excellent waterlogging resistance. Thus, exogenous 6-BA was found to be effective in enhancing the growth of plants stressed by waterlogging in terms of the weight of the shoots and roots, shoot height, and leaf area. In addition to this, exogenous 6-BA also reduced the accumulation of O2-, H2O2, and MDA, increased ascorbate peroxidase (APX), glutathione reductase (GR), dehydroascorbate reductase (DHAR), and monodehydroascorbate reductase (MDHAR) activity, and enhanced ascorbic acid (AsA), and reduced glutathione (GSH) concentration through the regulation of the efficiency of the AsA-GSH cycle system in maize plants. Hence, the application of exogenous 6-BA can alleviate waterlogging-induced damage and improve waterlogging tolerance in waxy corn via the activation of the AsA-GSH cycle system and the elimination of ROS.

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“…PhyB inactivation, which increases the abundance of phytochrome-interacting factors (PIFs), enhances heat stress tolerance by shifting the fatty acid composition from unsaturated to saturated forms ( Arico et al, 2019 ). In plants, high-temperature exposure leads to the accumulation of unfolded proteins in the ER, causing an ER stress response ( Neill et al, 2019 ). Phytochromes can integrate thermosensory signaling into the ER stress response.…”

Section: Discussionmentioning

confidence: 99%

Phytochrome B Positively Regulates Red Light-Mediated ER Stress Response in Arabidopsis

et al. 2022

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Light plays a crucial role in plant growth and development, and light signaling is integrated with various stress responses to adapt to different environmental changes. During this process, excessive protein synthesis overwhelms the protein-folding ability of the endoplasmic reticulum (ER), causing ER stress. Although crosstalk between light signaling and ER stress response has been reported in plants, the molecular mechanisms underlying this crosstalk are poorly understood. Here, we demonstrate that the photoreceptor phytochrome B (phyB) induces the expression of ER luminal protein chaperones as well as that of unfolded protein response (UPR) genes. The phyB-5 mutant was less sensitive to tunicamycin (TM)-induced ER stress than were the wild-type plants, whereas phyB-overexpressing plants displayed a more sensitive phenotype under white light conditions. ER stress response genes (BiP2 and BiP3), UPR-related bZIP transcription factors (bZIP17, bZIP28, and bZIP60), and programmed cell death (PCD)-associated genes (OXI1, NRP1, and MC8) were upregulated in phyB-overexpressing plants, but not in phyB-5, under ER stress conditions. The ER stress-sensitive phenotype of phyB-5 under red light conditions was eliminated with a reduction in photo-equilibrium by far-red light and darkness. The N-terminal domain of phyB is essential for signal transduction of the ER stress response in the nucleus, which is similar to light signaling. Taken together, our results suggest that phyB integrates light signaling with the UPR to relieve ER stress and maintain proper plant growth.

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Plant growth regulators interact with elevated temperature to alter heat stress signaling via the Unfolded Protein Response in maize

Cited by 28 publications

References 29 publications

Root Growth Adaptation to Climate Change in Crops

Root Growth Adaptation to Climate Change in Crops

Exogenous 6-Benzyladenine Improves Waterlogging Tolerance in Maize Seedlings by Mitigating Oxidative Stress and Upregulating the Ascorbate-Glutathione Cycle

Phytochrome B Positively Regulates Red Light-Mediated ER Stress Response in Arabidopsis

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