How Plant Hormones Mediate Salt Stress Responses

Yu, Zipeng; Duan, Xiangbo; Luo, Lu; Dai, Shaojun; Ding, Zhaojun; Xia, Guangmin

doi:10.1016/j.tplants.2020.06.008

Cited by 479 publications

(391 citation statements)

References 156 publications

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“…A significant accumulation of ABA is essential to active plant protective mechanisms [72], which regulate leaf water potential and stomatal closing to avoid water losses [73]. It is well known that the increase of ABA synthesis and the decrease of TZ production is an effective defense mechanism of plants in response to salt stress [74]. However, in our experiment this behavior was not so clear in Crithmum plants, since RO brine did not induce the accumulation of ABA.…”

Section: Discussioncontrasting

confidence: 56%

Recycled Wastewater and Reverse Osmosis Brine Use for Halophytes Irrigation: Differences in Physiological, Nutritional and Hormonal Responses of Crithmum maritimum and Atriplex halimus Plants

et al. 2021

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Halophytes are capable of coping with excessive NaCl in their tissues, although some species may differ in their degree of salt tolerance. In addition, it is not clear whether they can tolerate other confounding factors and impurities associated with non-conventional waters. The experiment was performed in a greenhouse with Crithmum maritimum and Atriplex halimus plants, growing on soil and irrigated with two different water types: reclaimed wastewater (RWW) (EC: 0.8–1.2 dS m−1) and reverse osmosis brine (ROB) (EC: 4.7–7.9 dS m−1). Both species showed different physiological and nutritional responses, when they were irrigated with ROB. Atriplex plants reduced leaf water potential and maintained leaf turgor as consequence of an osmotic adjustment process. Atriplex showed higher intrinsic water use efficiency than Crithmum, regardless of the type of water used. In Crithmum, the water status and photosynthetic efficiency were similar in both treatments. Crithmum presented a higher leaf accumulation of B and Ca ions, while Atriplex a higher amount of K, Mg, Na and Zn. Crithmum plants irrigated with ROB presented higher concentrations of 1-aminocyclopropane-1-carboxylic acid and trans-zeatin-glucoside, whereas abscisic acid concentration was lower. Atriplex showed a lower concentration of trans-zeatin-riboside and scopoletin. The characteristics associated to water irrigation did not influence negatively the development of any of these species, which confirms the use of brine as an alternative to irrigate them with conventional waters.

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Section: Discussioncontrasting

confidence: 56%

Recycled Wastewater and Reverse Osmosis Brine Use for Halophytes Irrigation: Differences in Physiological, Nutritional and Hormonal Responses of Crithmum maritimum and Atriplex halimus Plants

et al. 2021

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“…PYR1 gbM variation is associated with soil excess salts, with high salt soils almost exclusively featuring gbM epialleles (Supplementary Fig 20c). PYR1 is an abscisic acid (ABA) receptor 73 , and ABA is a central regulator of plant salt stress responses 74 . GbM variation in the calcium sensor SOS3 75 associates with soil salinity and sodicity (Supplementary Fig.…”

Section: Gbm and Tem Are Independent Phenomenamentioning

confidence: 99%

Epigenetic inheritance mediates phenotypic diversity in natural populations

Shahzad

Moore

Zilberman

2021

Preprint

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Cytosine methylation is an epigenetically heritable DNA modification common in plant and animal genes, but the functional and evolutionary significance of gene body methylation (gbM) has remained enigmatic. Here we show that gbM enhances gene expression in Arabidopsis thaliana. We also demonstrate that natural gbM variation influences drought and heat tolerance and flowering time by modulating gene expression, including that of Flowering Locus C (FLC). Notably, epigenetic variation accounts for as much trait heritability in natural populations as DNA sequence polymorphism. Furthermore, we identify gbM variation in numerous genes associated with environmental variables, including a strong association between flowering time, spring atmospheric NO2 - a by-product of fossil fuel burning - and FLC epialleles. Our study demonstrates that gbM is an important modulator of gene expression, and its natural variation fundamentally shapes phenotypic diversity in plant populations. Thus, gbM provides an epigenetic basis for adaptive evolution independent of genetic polymorphism.

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“…High levels of salt can also induce oxidative stress mediated by reactive oxygenic species (ROS), which disrupt regular lipid, protein, and nuclear metabolism [ 3 , 4 ]. Stress hormones such as abscisic acid (ABA), salicyclic acid (SA), jasmonic acid (JA), and ethylene, as well as growth hormones including auxin, cytokinins (CKs), gibberellic acid (GA), and brassinosteroids (BRs), which play important roles in mediating salinity stress signals and controlling the balance between growth and stress responses [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Gene Expression Profiles and Flavonoid Accumulation during Salt Stress in Ginkgo biloba Seedlings

Liu

et al. 2020

Plants

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Ginkgo biloba is an economically valuable tree, as a variety of flavonoid compounds are produced by the leaves of its seedlings. Although soil salinity is a serious threat to agricultural productivity worldwide, the effect of salt stress on G. biloba seedlings remains unclear. In this study, we found that under high NaCl concentrations (200 and 300 mmol/L), seedling growth was inhibited and the water content, chlorophyll, and peroxidase (POD) enzyme activity were significantly decreased in the leaves, whereas the soluble protein and proline levels increased significantly. However, at low NaCl concentrations (50 and 100 mmol/L), the seedlings grew normally because of the regulation of catalase (CAT) and POD enzyme activities. To elucidate the molecular mechanisms behind G. biloba salt tolerance, we examined the transcriptome of G. biloba seedlings treated with 100 mmol/L NaCl. Twelve differentially expressed genes (DEGs) were found to be involved in ion osmotic potential signal transduction and amplification, including two ABA signaling genes, five CDPK/CIPK genes, and five mitogen-activated protein kinase (MAPK) signaling genes. We also found that NAC transcription factors may be involved in the salt stress response; these included positive regulators (Gb_12203, Gb_27819, Gb_37720, and Gb_41540) and negative regulators (Gb_32549, Gb_35048, and Gb_37444). Importantly, treatment with 100 mmol/L NaCl can significantly improve flavonoid and flavonol glycoside biosynthesis. Simultaneously, the expression of flavonoid biosynthesis-related genes, including PAL (Gb_10949, Gb_21115) and FLS (Gb_00285, Gb_14024, and Gb_14029), was significantly upregulated. Based on these results, we reveal that G. biloba seedlings can tolerate low-level soil salinity stress through the regulation of different kinds of genes and transcriptome factors, especially flavonoid biosynthesis, which is improved to respond to environmental stress.

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How Plant Hormones Mediate Salt Stress Responses

Cited by 479 publications

References 156 publications

Recycled Wastewater and Reverse Osmosis Brine Use for Halophytes Irrigation: Differences in Physiological, Nutritional and Hormonal Responses of Crithmum maritimum and Atriplex halimus Plants

Recycled Wastewater and Reverse Osmosis Brine Use for Halophytes Irrigation: Differences in Physiological, Nutritional and Hormonal Responses of Crithmum maritimum and Atriplex halimus Plants

Epigenetic inheritance mediates phenotypic diversity in natural populations

Gene Expression Profiles and Flavonoid Accumulation during Salt Stress in Ginkgo biloba Seedlings

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