Role of Na+ transporters HKT1;1 and HKT1;2 in tomato salt tolerance. I. Function loss of cheesmaniae alleles in roots and aerial parts

Romero-Aranda, R.; Espinosa, Jesús; González-Fernández, Paloma; Jaime-Fernández, Emilio; Traverso, José Á.; Asíns, M. J.; Belver, Andrés

doi:10.1016/j.plaphy.2021.10.018

Cited by 12 publications

(11 citation statements)

References 54 publications

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“…In this experiment, we found an improved expression of CaHKT1 only in roots, especially in C12, reflected in the PCA analysis. Similar results were found in tomato, where ScHKT1;1 and ScHKT1;2 overexpression induced tolerance to salt stress by Na + removal from the xylem and transferring into the phloem in aerial organs (Romero‐Aranda et al, 2021).…”

Section: Discussionsupporting

confidence: 71%

Differential gene expression patterns and physiological responses improve adaptation to high salinity concentration in pepper accessions

López‐Serrano,

Martínez‐Cuenca,

López‐Galarza

et al. 2023

Physiologia Plantarum

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High salinity decreases the productivity of crops worldwide. Pepper is particularly sensitive to high salt concentrations. Herein, we subjected three tolerant pepper accessions (C12, B14 and A25) to high sodium chloride concentration (70 mM NaCl). The aerial and root biomass, leaf and root osmotic potential (Ψπ), Na+, Cl−, K+ and proline concentrations and the relative expression of the putative genes CaSOS1, CaHKT1, three CaNHXs and CaP5CS were measured. Different salinity tolerance strategies depending on the pepper accession were identified. In C12, tolerance was attributed to the accumulation of Na+ in vacuoles and endosomes by the activation of vacuolar CaNHXs genes and the reduction in Ψπ; additionally, the activation of CaHKT1 and CaSOS1 in leaves and roots moved and accumulated Na+ ions in the xylem and xylem parenchyma cells (XPC) as well as expulsed it out of the root cells. A25 accession, on the contrary, was specialized in compartmentalizing Na+ ions in root and leaf vacuoles and root XPC by the up‐regulation of CaNHXs and CaHKT1, respectively, avoiding a toxic accumulation in leaves. Finally, B14 accession moved and accumulated Na+ in xylem and XPC, reducing its concentration in roots by the activation of CaSOS1 and CaHKT1. This study shade light on different tolerance mechanisms of pepper plants to overcome salt stress.

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Section: Discussionsupporting

confidence: 71%

Differential gene expression patterns and physiological responses improve adaptation to high salinity concentration in pepper accessions

López‐Serrano,

Martínez‐Cuenca,

López‐Galarza

et al. 2023

Physiologia Plantarum

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“…Beside this, high‐affinity potassium transporters (HKTs and HAKs) and aquaporins such as AtPIP2‐1 also help in Na + influx. Various gene knockout studies have confirmed that HKT transporters, such as HKT1;1 and HKT1;2, play an essential role in Na + /K + homeostasis, Na + exclusion, and Na + partitioning from root to shoot (Romero‐Aranda et al, 2021). HKT1;1 and HKT1;5 prevent excessive Na + accumulation in shoots by transporting Na + from xylem to xylem parenchyma in the roots (Venkataraman et al, 2021).…”

Section: Ion Channels and Transportersmentioning

confidence: 99%

Ion transporters and their regulatory signal transduction mechanisms for salinity tolerance in plants

Joshi

Nath

Singh

et al. 2022

Physiologia Plantarum

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Soil salinity is one of the most serious threats to plant growth and productivity. Due to global climate change, burgeoning population and shrinking arable land, there is an urgent need to develop crops with minimum reduction in yield when cultivated in salt‐affected areas. Salinity stress imposes osmotic stress as well as ion toxicity, which impairs major plant processes such as photosynthesis, cellular metabolism, and plant nutrition. One of the major effects of salinity stress in plants includes the disturbance of ion homeostasis in various tissues. In the present study, we aimed to review the regulation of uptake, transport, storage, efflux, influx, and accumulation of various ions in plants under salinity stress. We have summarized major research advancements towards understanding the ion homeostasis at both cellular and whole‐plant level under salinity stress. We have also discussed various factors regulating the function of ion transporters and channels in maintaining ion homeostasis and ionic interactions under salt stress, including plant antioxidative defense, osmo‐protection, and osmoregulation. We further elaborated on stress perception at extracellular and intracellular levels, which triggers downstream intracellular‐signaling cascade, including secondary messenger molecules generation. Various signaling and signal transduction mechanisms under salinity stress and their role in improving ion homeostasis in plants are also discussed. Taken together, the present review focuses on recent advancements in understanding the regulation and function of different ion channels and transporters under salt stress, which may pave the way for crop improvement.

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“…Silencing of HKT1;2 alters the Na + /K + ratio, suppresses the response of SOS1 to salt, and increases salt hypersensitivity ( Asins et al, 2013 ; Jaime-Pérez et al, 2017 ; Romero-Aranda et al, 2020 ). HKT1;2 of S. cheesmaniae is not only involved in xylem Na + unloading but also involved in Na + uploading into the phloem, thus promoting Na + recirculation from aerial parts to the roots, which can be additionally favored by HKT1;1 silencing at the roots ( Romero-Aranda et al, 2021 ). Decreasing Na + content in young leaves is probably linked to the up-regulation of SOS1 contributing to Na + exclusion from the cytosol toward the leaf apoplast.…”

Section: Mechanisms For Salt Tolerance In Tomatomentioning

confidence: 99%

Tomato salt tolerance mechanisms and their potential applications for fighting salinity: A review

Guo

Wang²,

Guo³

et al. 2022

Front. Plant Sci.

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One of the most significant environmental factors affecting plant growth, development and productivity is salt stress. The damage caused by salt to plants mainly includes ionic, osmotic and secondary stresses, while the plants adapt to salt stress through multiple biochemical and molecular pathways. Tomato (Solanum lycopersicum L.) is one of the most widely cultivated vegetable crops and a model dicot plant. It is moderately sensitive to salinity throughout the period of growth and development. Biotechnological efforts to improve tomato salt tolerance hinge on a synthesized understanding of the mechanisms underlying salinity tolerance. This review provides a comprehensive review of major advances on the mechanisms controlling salt tolerance of tomato in terms of sensing and signaling, adaptive responses, and epigenetic regulation. Additionally, we discussed the potential application of these mechanisms in improving salt tolerance of tomato, including genetic engineering, marker-assisted selection, and eco-sustainable approaches.

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Role of Na+ transporters HKT1;1 and HKT1;2 in tomato salt tolerance. I. Function loss of cheesmaniae alleles in roots and aerial parts

Cited by 12 publications

References 54 publications

Differential gene expression patterns and physiological responses improve adaptation to high salinity concentration in pepper accessions

Differential gene expression patterns and physiological responses improve adaptation to high salinity concentration in pepper accessions

Ion transporters and their regulatory signal transduction mechanisms for salinity tolerance in plants

Tomato salt tolerance mechanisms and their potential applications for fighting salinity: A review

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