Auxin as a Mediator of Abiotic Stress Responses

Salopek‐Sondi, Branka; Pavlović, Iva; Smolko, Ana; Šamec, Dunja

doi:10.1002/9781118889022.ch1

Cited by 4 publications

(2 citation statements)

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“…It has been determined that the application of internal and external auxin stimulates the relative water content, chlorophyll content, antioxidant enzyme activity, and stimulates tolerance for different abiotic stresses in a positive direction (Shi et al 2014;Santos et al 2020;Mir et al 2022). Studies have shown that auxin hormones are also important in the regulation of the defence response to salt stress (Fahad et al 2015;Salopek-Sondi et al 2017). It has been determined that the internal IAA levels of plants exposed to high salt concentrations are rapidly decreasing.…”

Section: Introductionmentioning

confidence: 99%

Treatment with auxin and paclobutrazol mediates ROS regulation, antioxidant defence system and cell wall response in salt treated soybean

Ayvaci,

Koc,

Cetinkaya

et al. 2023

Braz. J. Bot

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IAA and PBZ play important role in resisting abiotic stress for plants. However, the effects of combination of these regulators in plants under salinity remained obscure. In the current study, the role of 50 ppm IAA and 10 ppm PBZ on mitigating salt stress (200 and 300 mM NaCl) was investigated in soybean (Glycine max L. cv. Planet). We identi ed that IAA or PBZ and IAA + PBZ improved the physiological parameters that damaged by salinity but PBZ performed best as observed by SEM. However, IAA was more succesfull to induce some antioxidant enzymes (SOD, CAT, APX, POX) although both of them reduced or did not affect GSH-related enzymes (DHAR, MDHAR, GST, GR, GPX). Beside this, combination of IAA and PBZ treatment showed the lowest MDA with inhibited salt stress induced oxidative damage. Additionally, PBZ was more effective against as IAA to reduce the PME and PAL enzyme activities as well as decreased arabinose content, while they were increased with salinity. IAA or PBZ increased lignin content and lead to reduce loosening in roots, while IAA performed best. Overall, this study rstly presents that these regulators ( 50 ppm IAA; 10 ppm PBZ) could be used together to increase salt tolerance in soybean plants via regulating physiological and biochemical metabolism, antioxidant defense system and cell wall modi ed parameters. Thus, the application of IAA /PBZ to salt treated soybean plants could be utilized as a model to increase plant's resistance under stress conditions.

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Section: Introductionmentioning

confidence: 99%

Treatment with auxin and paclobutrazol mediates ROS regulation, antioxidant defence system and cell wall response in salt treated soybean

Ayvaci,

Koc,

Cetinkaya

et al. 2023

Braz. J. Bot

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“…Studies in a variety of plant species have shown that auxin homeostasis is a direct link between growth regulation and stress adaptation responses (see review [ 27 ]). According to microarray data tracking the expression of YUCCA flavin monooxygenases (YUCs) (involved in the major IAA biosynthetic pathway in Arabidopsis), auxin biosynthesis is shifted from columella cells to the root epidermis during salt stress [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Altered Root Growth, Auxin Metabolism and Distribution in Arabidopsis thaliana Exposed to Salt and Osmotic Stress

Smolko

Bauer

Pavlović

et al. 2021

IJMS

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Salt and osmotic stress are the main abiotic stress factors affecting plant root growth and architecture. We investigated the effect of salt (100 mM NaCl) and osmotic (200 mM mannitol) stress on the auxin metabolome by UHPLC-MS/MS, auxin distribution by confocal microscopy, and transcript levels of selected genes by qRT-PCR in Arabidopsis thaliana ecotype Columbia-0 (Col-0) and DR5rev::GFP (DR5) line. During long-term stress (13 days), a stability of the auxin metabolome and a tendency to increase indole-3-acetic acid (IAA) were observed, especially during salt stress. Short-term stress (3 h) caused significant changes in the auxin metabolome, especially NaCl treatment resulted in a significant reduction of IAA. The data derived from auxin profiling were consistent with gene expressions showing the most striking changes in the transcripts of YUC, GH3, and UGT transcripts, suggesting disruption of auxin biosynthesis, but especially in the processes of amide and ester conjugation. These data were consistent with the auxin distribution observed in the DR5 line. Moreover, NaCl treatment caused a redistribution of auxin signals from the quiescent center and the inner layers of the root cap to the epidermal and cortical cells of the root elongation zone. The distribution of PIN proteins was also disrupted by salt stress; in particular, PIN2 was suppressed, even after 5 min of treatment. Based on our results, the DR5 line was more sensitive to the applied stresses than Col-0, although both lines showed similar trends in root morphology, as well as transcriptome and metabolome parameters under stress conditions.

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