Crosstalk Between Gibberellins and Abiotic Stress Tolerance Machinery in Plants

Sharan, Ashutosh; Dkhar, Jeremy; Singla‐Pareek, Sneh L.; Pareek, Ashwani

doi:10.1002/9781118889022.ch5

Cited by 6 publications

(6 citation statements)

References 125 publications

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“…At the beginning of antioxidant defense, signaling molecules GA and SA cope with salt stress and modulate many morpho-physiological activities [96]. There are previous researches indicating that GAs have an active performance in SA biosynthesis and action [97]. The exogenous supply of GA 3 or over-expression of GASA genes reverts to salt stress, which is regulated by SA biosynthesis in Arabidopsis because GASA genes are the putative intermediates between GA and SA hormones (Figure 4).…”

Section: Gas and Sa Cross-talk During Salt Stressmentioning

confidence: 99%

“…Previous research showed that the overly-expressed GA2ox5 genes are capable of coping with high salinity [121]. The adaptation to salt stress is encouraged by decreasing GA levels caused by the induction of GA 2-oxidase genes [97]. In Arabidopsis thaliana, the over-expression of AtGA2ox7/AtGA2ox8 genes reduced the content of GAs along with delaying the flowering time.…”

Section: Role Of Ga and Sa Synthase Genes In Salt Stress Tolerancementioning

confidence: 99%

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Pivotal Role of Phytohormones and Their Responsive Genes in Plant Growth and Their Signaling and Transduction Pathway under Salt Stress in Cotton

Ahmad

Zhu

Zhou

et al. 2022

IJMS

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The presence of phyto-hormones in plants at relatively low concentrations plays an indispensable role in regulating crop growth and yield. Salt stress is one of the major abiotic stresses limiting cotton production. It has been reported that exogenous phyto-hormones are involved in various plant defense systems against salt stress. Recently, different studies revealed the pivotal performance of hormones in regulating cotton growth and yield. However, a comprehensive understanding of these exogenous hormones, which regulate cotton growth and yield under salt stress, is lacking. In this review, we focused on new advances in elucidating the roles of exogenous hormones (gibberellin (GA) and salicylic acid (SA)) and their signaling and transduction pathways and the cross-talk between GA and SA in regulating crop growth and development under salt stress. In this review, we not only focused on the role of phyto-hormones but also identified the roles of GA and SA responsive genes to salt stress. Our aim is to provide a comprehensive review of the performance of GA and SA and their responsive genes under salt stress, assisting in the further elucidation of the mechanism that plant hormones use to regulate growth and yield under salt stress.

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Section: Gas and Sa Cross-talk During Salt Stressmentioning

confidence: 99%

Section: Role Of Ga and Sa Synthase Genes In Salt Stress Tolerancementioning

confidence: 99%

Pivotal Role of Phytohormones and Their Responsive Genes in Plant Growth and Their Signaling and Transduction Pathway under Salt Stress in Cotton

Ahmad

Zhu

Zhou

et al. 2022

IJMS

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“…Spraying wi 100 ppm of GA3 resulted in significant improvement in stevia's shoot height, shoot d weight, root dry weight, and leaf area under salt stress conditions [32]. Previous studi have also documented the positive influence of GA3 on various crop species [11,[33][34][35] indicating its potential as a stress mitigation tool. GA3 is recognized for its ability to stim…”

Section: Discussionmentioning

confidence: 91%

The Induction of Salt Stress Tolerance by Gibberellic Acid Treatment in Stevia rebaudiana Bertoni Plants

Janah,

Ben-Laouane,

Elhasnaoui

et al. 2024

IJPB

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Salinity poses a perpetual threat to agricultural lands, presenting an ongoing challenge to global food security. The present study aimed to explore the potential benefits of gibberellic acid (GA3) in enhancing stevia’s tolerance to salt stress. The experimental treatments comprised a control group (C) with 0 mM NaCl, salt stress (S) with 80 mM NaCl, 50 ppm of GA3 (G1), 100 ppm of GA3 (G2), as well as combinations of GA3 with salt stress (G1+S and G2+S). Exposure to saline water (80 mM NaCl) significantly decreased plant growth, water status, and photosynthetic attributes. However, it also led to notable increases in proline, glycine betaine, malondialdehyde (MDA), and antioxidant enzyme activities compared to the control treatment. Application of 100 ppm of GA3 effectively alleviated salt stress by enhancing plant performance under saline conditions, as evidenced by increased aerial (54%) and root (31%) dry weights compared to the control. Additionally, GA3 treatment resulted in elevated activities of polyphenol oxidase (24%), peroxidase (12%), superoxide dismutase (31%), and catalase (11%) while reducing MDA content by 41%, electrolyte leakage by 37%, and hydrogen peroxide by 34%. The use of phytohormones such as GA3 emerges as a promising strategy for mitigating salt stress-induced damage. It not only enhances plant performance but also reduces oxidative stress, offering protection against the detrimental effects of soil salinization.

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“…It has been noted that a reduction of GA typically improves plant salt tolerance (Sharan et al 2017). However, although the link is not well-established, GA may be involved in positively regulating heat shock protein gene expression (Zhang and Wang 2011).…”

Section: Resultsmentioning

confidence: 99%

Effect of Plant Growth Regulators on Creeping Bentgrass during Heat, Salt, and Combined Stress

Drake

Danneberger

Gardner

2023

horts

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Creeping bentgrass (Agrostis stolonifera L.) is a turfgrass species that is widely used on golf courses throughout the United States. In field settings, plants are often subjected to more than one stress at a time, and studying stresses independently is likely insufficient. Stresses, such as heat stress and salt stress, can affect plant hormone levels and, in turn, plant hormone levels can affect how well the plant tolerates stress. The objectives of the experiments were to determine if the levels of heat stress and salt stress used would be detrimental to creeping bentgrass health, and if applying plant growth regulators could improve plant health during stress. During the first experiment, creeping bentgrass was transplanted to hydroponics systems in two different growth chambers. One chamber was set to have day and night temperatures of 35 °C and 30 °C (heat stress), respectively, and the other had day and night temperatures of 25 °C and 20 °C, respectively. Within each chamber, one block received a 50 mM NaCl treatment (salt stress) and the other did not (control). The stress treatments were applied for 14 days. Results of the first experiment indicated that the treatments were sufficient to negatively affect creeping bentgrass growth and health as indicated by fresh shoot and root weights, tillering, electrolyte leakage, and total chlorophyll content (TCC). There were significant interactions of temperature × salt level detected for shoot and root weights and electrolyte leakage. Plants that were exposed to both heat stress and salt stress were more negatively affected than plants exposed to either heat stress or salt stress alone for all metrics except for tillering. The presence of salt reduced tillering regardless of the temperature regimen. During the second experiment, plants were treated the same, but the plant growth regulator (PGR) treatments were also applied. The PGR treatments consisted of two different gibberellic acid (GA) synthesis inhibitor products, 2,4-dichlorophenoxyacetic acid, two different rates of aminoethoxyvinylglycine (AVG), an ethylene synthesis suppressor, and plants that were not treated with the PGR. In addition to the measurements of plant health and growth, dry shoot and root weights were measured. For the TCC, there was a two-way interaction between temperature × PGR treatment. For electrolyte leakage, there was a three-way interaction between temperature × salt level × PGR treatment. Combined heat stress and salt stress negatively affected all plants regardless of PGR treatment, but there were differences between PGR treatments. Plants treated with AVG exhibited improved health and growth compared with the other PGR treatments. These plants had the highest shoot and root masses. Plants treated with GA synthesis inhibitors had the lowest shoot and root masses as well as the lowest TCC when subjected to stress.

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Crosstalk Between Gibberellins and Abiotic Stress Tolerance Machinery in Plants

Cited by 6 publications

References 125 publications

Pivotal Role of Phytohormones and Their Responsive Genes in Plant Growth and Their Signaling and Transduction Pathway under Salt Stress in Cotton

Pivotal Role of Phytohormones and Their Responsive Genes in Plant Growth and Their Signaling and Transduction Pathway under Salt Stress in Cotton

The Induction of Salt Stress Tolerance by Gibberellic Acid Treatment in Stevia rebaudiana Bertoni Plants

Effect of Plant Growth Regulators on Creeping Bentgrass during Heat, Salt, and Combined Stress

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