Targeting Redox Regulatory Mechanisms for Salinity Stress Tolerance in Crops

Tanveer, Mohsin; Shabala, Sergey

doi:10.1007/978-3-319-75671-4_8

Cited by 61 publications

(32 citation statements)

References 138 publications

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“…Salt stress affects the large-scale metabolic activities that result in excessive ROS accumulation, which include singlet oxygen ( 1 O 2 ), superoxide radical (O 2 •− ), hydrogen peroxide (H 2 O 2 ) and hydroxyl radical (•OH), while similar results were observed in Medicago truncatula [28]. The ROS cytotoxicity activates the oxygen species, leading to disruption of optimum metabolic activities, which induce lipid peroxidation in plants [29,30]. Thus, the equilibrium between ROS production and quenching is critical under salt stress.…”

Section: Discussionmentioning

confidence: 98%

Transcriptome Sequence Analysis Elaborates a Complex Defensive Mechanism of Grapevine (Vitis vinifera L.) in Response to Salt Stress

Guan

Haider

Khan

et al. 2018

IJMS

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Salinity is ubiquitous abiotic stress factor limiting viticulture productivity worldwide. However, the grapevine is vulnerable to salt stress, which severely affects growth and development of the vine. Hence, it is crucial to delve into the salt resistance mechanism and screen out salt-resistance prediction marker genes; we implicated RNA-sequence (RNA-seq) technology to compare the grapevine transcriptome profile to salt stress. Results showed 2472 differentially-expressed genes (DEGs) in total in salt-responsive grapevine leaves, including 1067 up-regulated and 1405 down-regulated DEGs. Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) annotations suggested that many DEGs were involved in various defense-related biological pathways, including ROS scavenging, ion transportation, heat shock proteins (HSPs), pathogenesis-related proteins (PRs) and hormone signaling. Furthermore, many DEGs were encoded transcription factors (TFs) and essential regulatory proteins involved in signal transduction by regulating the salt resistance-related genes in grapevine. The antioxidant enzyme analysis showed that salt stress significantly affected the superoxide dismutase (SOD), peroxidase (POD), catalase (CAT) and glutathione S-transferase (GST) activities in grapevine leaves. Moreover, the uptake and distribution of sodium (Na+), potassium (K+) and chlorine (Cl−) in source and sink tissues of grapevine was significantly affected by salt stress. Finally, the qRT-PCR analysis of DE validated the data and findings were significantly consistent with RNA-seq data, which further assisted in the selection of salt stress-responsive candidate genes in grapevine. This study contributes in new perspicacity into the underlying molecular mechanism of grapevine salt stress-tolerance at the transcriptome level and explore new approaches to applying the gene information in genetic engineering and breeding purposes.

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Section: Discussionmentioning

confidence: 98%

Transcriptome Sequence Analysis Elaborates a Complex Defensive Mechanism of Grapevine (Vitis vinifera L.) in Response to Salt Stress

Guan

Haider

Khan

et al. 2018

IJMS

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“…As a result, the number of studies attempting to boost antioxidant activity in plants has increased exponentially over the last two decades. At the same time, many other reports questioned the validity of this approach, reporting no or a negative correlation between activity of antioxidant enzymes and plant salinity stress tolerance (Tanveer & Shabala, 2018). The reason for this discrepancy may be related to the fact that ROS also play an important signalling role in plant adaptive and developmental responses Kimura et al, 2020;Mittler, 2017).…”

Section: Ros Production and Signalling In Plant Adaptation To Salinitymentioning

confidence: 99%

NADPH oxidases and the evolution of plant salinity tolerance

Liu

Ouyang

et al. 2020

Plant Cell & Environment

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Soil salinization is a major threat to global food security and the biodiversity of natural ecosystems. To adapt to salt stress, plants rely on ROS-mediated signalling networks that operate upstream of a broad array of physiological and genetic processes. A key player in ROS signalling is NADPH oxidase, a plasma-membrane-bound enzyme encoded by RBOH genes. In this study, we have conducted a comprehensive bioinformatic analysis of over 50 halophytic and glycophytic species to link the difference in the kinetics of ROS signalling between contrasting species with the abundance and/or structure of NADPH oxidases. The RBOH proteins were predicted in all the tested plant lineages except some algae species from the Rhodophyta, Chlorophyta and Streptophyta. Within the glycophytic group, the number of RBOH copies correlated negatively with salinity stress tolerance, suggesting that a reduction in the number of RBOH isoforms may be potentially related to the evolution of plant salinity tolerance. While halophytes did not develop unique protein families during evolution, they evolved additional phosphorylation target sites at the N-termini of NADPH oxidases, potentially modulating enzyme activity and allowing more control over their function, resulting in more efficient ROS signalling and adaptation to saline conditions.

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“…In stressed condition, plant defense against excessive ROS is associated with the protection of cellular redox homeostasis, which is mostly conferred by some antioxidant enzymatic activity for example superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), and ascorbate peroxidase (APX), etc. (Tang et al, 2015;Tanveer and Shabala, 2018;Abdel Latef et al, 2020c;Rahman et al, 2020;Dawood et al, 2021). Therefore, any mechanisms that maintain optimal K + /Na + content, nutritional balance, and ROS in plants may provide tolerance capability against salinity (Assaha et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Mitigation of salinity stress by exogenous application of cytokinin in faba bean (Vicia faba L.)

Latef

Hasanuzzaman

Tahjib‐Ul‐Arif

2021

Not Bot Horti Agrobo

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Soil salinity limits agricultural land use and crop productivity, thereby a major threat to global food safety. Plants treated with several phytohormones including cytokinins were recently proved as a powerful tool to enhance plant’s adaptation against various abiotic stresses. The current study was designed to investigate the potential role of 6-benzyladenine (BA) to improve broad bean (Vicia faba L.) salinity tolerance. The salt-stressed broad bean plantlets were classified into two groups, one of which was sprayed with water and another was sprayed with 200 ppm of BA. Foliar applications of BA to salt-exposed plants promoted the growth performance which was evidenced by enhanced root-shoot fresh and dry biomass. Reduced proline was strongly connected to the enhanced soluble proteins and free amino acids contents, protecting plant osmotic potential following BA treatment in salt-stressed broad bean. BA balanced entire mineral homeostasis and improved mineral absorption and translocation from roots to shoots, shoots to seeds and roots to seeds in salt-stressed plants. Excessive salt accumulation increased malondialdehyde level in leaves creating oxidative stress and disrupting cell membrane whereas BA supplementation reduced lipid peroxidation and improved oxidative defence. BA spray to salinity-stressed plants also compensated oxidative damage by boosting antioxidants defence mechanisms, as increased the enzymatic activity of superoxide dismutase, catalase, peroxidase and ascorbate peroxidase. Moreover, clustering heatmap and principal component analysis revealed that mineral imbalances, osmotic impairments and increased oxidative damage were the major contributors to salts toxicity, on the contrary, BA-augmented mineral homeostasis and higher antioxidant capacity were the reliable markers for creating salinity stress tolerance in broad bean. In conclusion, the exogenous application of BA alleviated the antagonistic effect of salinity and possessed broad bean to positively regulate the osmoprotectants, ion homeostasis, antioxidant activity and finally plant growth and yield, perhaps suggesting these easily-accessible and eco-friendly organic compounds could be powerful tools for the management of broad bean growth as well as the development of plant resiliency in saline prone soils.

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Targeting Redox Regulatory Mechanisms for Salinity Stress Tolerance in Crops

Cited by 61 publications

References 138 publications

Transcriptome Sequence Analysis Elaborates a Complex Defensive Mechanism of Grapevine (Vitis vinifera L.) in Response to Salt Stress

Transcriptome Sequence Analysis Elaborates a Complex Defensive Mechanism of Grapevine (Vitis vinifera L.) in Response to Salt Stress

NADPH oxidases and the evolution of plant salinity tolerance

Mitigation of salinity stress by exogenous application of cytokinin in faba bean (Vicia faba L.)

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