THE ROLE OF NAA IN THE REGULATION OF MINERAL CONCENTRATION OF DATE PALM SEEDLINGS ('SHABEEBY') UNDER SALT STRESS CONDITIONS

2010 ◽  
pp. 121-129
Author(s):  
H.J. Aljuburi ◽  
A.M. Maroff ◽  
M.K. Wafi ◽  
M. Al-Far
Keyword(s):  
Salt Stress ◽  
Date Palm ◽  
Stress Conditions ◽  
Mineral Concentration

scholarly journals Characterization of a Novel Member of the DegS-DegU Regulon Affected by Salt Stress in Bacillus subtilis

1998 ◽  
Vol 180 (7) ◽  
pp. 1855-1861 ◽  
Author(s):  
Véronique Dartois ◽  
Michel Débarbouillé ◽  
Frank Kunst ◽  
Georges Rapoport
Keyword(s):  
Bacillus Subtilis ◽  
Salt Stress ◽  
Control Region ◽  
Negative Control ◽  
Control Site ◽  
High Salt ◽  
Stress Conditions ◽  
Target Sequence ◽  
Marine Habitats

ABSTRACT As a soil bacterium also found in estuarine and marine habitats,Bacillus subtilis has evolved various sensing and adaptation systems in order to face salt stress conditions. Among these regulatory mechanisms is the DegS-DegU signal transduction system, which was previously shown to be stimulated by high salt concentrations. A search for promoters regulated in response to salt stress led to the identification of wapA, encoding a wall-associated protein, which is strongly expressed at low salt concentrations and almost completely repressed in the presence of 0.7 M disodium succinate. Repression of wapA transcription by salt stress was shown to require the phosphorylated form of DegU. Moreover, DegU-mediated repression of wapA occurred only in high-salt medium. Alignment between the control region ofwapA and other DegU-regulated promoters allowed the identification of a putative DegU target sequence, AGAAN11TTCAG. Mutation/deletion analyses of thewapA promoter region confirmed the role of the putative DegU control site in repression of wapA transcription at high salt concentrations and revealed a second site of repression located downstream from the transcription start site. Since residual negative control was observed at this second site in the absence of DegU, it seems likely that an additional repressor acts on thewapA control region to further downregulatewapA transcription under salt stress conditions.

scholarly journals Anatomical Modifications in two Juncus Species under Salt Stress Conditions

2015 ◽  
Vol 43 (2) ◽  
pp. 501-506
Author(s):  
Mohamad Al HASSAN ◽  
Gholamreza GOHARI ◽  
Monica BOSCAIU ◽  
Oscar VICENTE ◽  
Marius N. GRIGORE
Keyword(s):  
Salt Stress ◽  
Salt Tolerance ◽  
Stress Responses ◽  
Stress Conditions ◽  
Anatomic Structure ◽  
Anatomical Structures ◽  
Efficient Mechanism ◽  
Damage Indicators ◽  
As Stress

The anatomic structure of roots and culms of two Juncus species with different degrees of salt tolerance was analysed in plants grown for two months under salt stress (NaCl treatments) and in control, non-treated plants. The aim of the study was not only to compare the anatomical structures of a halophyte (J. acutus) and a related glycophyte (J. articulatus), but mostly to assess whether salt stress induced anatomical modifications, by identifying differences between control and treated plants. Several slight differences have been indeed detected, in terms of endodermis type, development of aerenchyma and extent of sclerenchyma in perivascular sheaths. The role of Casparian endodermis was here discussed in relation to its complex implications in controlling salt influx at the root level that is an efficient mechanism involved in halophytes. Aerenchyma is a common feature found in marshy halophytes, allowing them to survive naturally under flooding conditions; however, when occurring in non-waterlogged plants, as is the case of this study, it should be regarded as a genetically, constitutive adaptation rather than an inducible one. Nevertheless, such anatomic modifications should be regarded as mere alterations due to stress – that is, as stress responses – and not as truly adaptations to salinity. In this context, the nature of these modifications – either considered as adaptations or damage indicators of salt stress – should be further reconsidered.

Role of Halotolerant Microbes in Plant Growth Promotion Under Salt Stress Conditions

2019 ◽  
pp. 209-253 ◽  
Author(s):  
Zahir Ahmad Zahir ◽  
Sajid Mahmood Nadeem ◽  
Muhammad Yahya Khan ◽  
Rana Binyamin ◽  
Muhammad Rashid Waqas
Keyword(s):  
Salt Stress ◽  
Plant Growth ◽  
Plant Growth Promotion ◽  
Growth Promotion ◽  
Stress Conditions

scholarly journals Characterization of MATE Gene Family And Its Role In Drought, Heat, And Salt Tolerance In Wheat (Triticum Aestivum L.)

2021 ◽  
Author(s):  
Joseph Noble Amoah ◽  
Yong Weon Seo
Keyword(s):  
Salt Stress ◽  
Expression Patterns ◽  
Triticum Aestivum L ◽  
Stress Conditions ◽  
Crop Species ◽  
Expression Levels ◽  
Cis Acting ◽  
Genome Wide ◽  
A Genome

Abstract To explore the response of multidrug and toxic compound extrusion (MATE) proteins to drought, heat, and salt stress in wheat, a genome-wide identification and expression study was performed. 20 MATE genes located on 4 of the 12 chromosomes were identified and categorized into four (I-1V) subfamilies, based on phylogenetic analysis. Wheat MATE family expansion was primarily driven by whole-genome duplication (WGD) and tandem events. In the same subfamily, gene exon-intron structures and motif composition are more similar. TaMATE genes had cis-acting elements that were implicated in stress and defense response. Tae-miR5175e was identified as the highly expressed miRNA that targets TaMATEs by miRNA prediction. When compared to controls, the relative expression patterns of seven TaMATE genes were substantially elevated during drought stress. TaMATE2, 10, 13, and 14 expression levels considerably elevated after 15 days (d) of heat stress, whereas TaMATE2, 14, 18, and 20 expression levels were highly upregulated following 15 d of salt stress treatment, indicating the crucial role of TaMATEs under these abiotic stress conditions. Furthermore, drought, heat, and salt stress decreased wheat water content, but increased malondialdehyde (MDA), electrolyte leakage (EL), and proline content, whereas the expression of the 7 putative MATE genes was correlated with physio-biochemical indicators of these stress conditions. The findings contribute to a better understanding of the complexities of MATEs and present a theoretical base for future MATE gene discovery and application in wheat and other crop species.

OP012 The role of H2S in pepper leaves under salt stress conditions

Nitric Oxide ◽  
2013 ◽  
Vol 31 ◽  
pp. S24
Author(s):  
M. Lisjak ◽  
T. Teklic ◽  
I. Wilson ◽  
M.E. Wood ◽  
M. Whiteman ◽  
...  
Keyword(s):  
Salt Stress ◽  
Stress Conditions ◽  
Pepper Leaves

scholarly journals Free prolin content in Arabidopsis thaliana Cat2 and Cat3 knockout mutants under salt stress

2016 ◽  
Vol 14 (1) ◽  
pp. 3-7 ◽  
Author(s):  
N. O. Didenko ◽  
I. M. Buzduga ◽  
R. A. Volkov ◽  
I. I. Panchuk
Keyword(s):  
Arabidopsis Thaliana ◽  
Salt Stress ◽  
Sodium Chloride ◽  
Cellular Response ◽  
Resistance Mechanisms ◽  
Stress Conditions ◽  
Free Proline ◽  
Knockout Mutants ◽  
Knockout Line

Aim. In plants, the enzymatic and non-enzymatic environmental stress resistance mechanisms function in a concerted manner, but the role of specific isoforms of antioxidant enzymes and their relationship to low molecular weight protective compounds is poorly understood. To investigate this question free proline levels were compared under salt stress conditions in wild-type Arabidopsis thaliana and knockout mutants for the catalase genes Cat2 and Cat3. Methods. Free proline content was measured under various treatments of plants with sodium chloride. Results. It was shown that under salt stress conditions free proline increase is impaired in leaves of mutants lacking CAT2 and CAT3 activity. In addition, cat3 knockout line shows a reduced basal level of proline under non-stress conditions. Conclusions. Suppression of response to salt stress points to a possible link between the rearrangement of the antioxidant system in the Cat genes knockouts and the regulation of protective cellular response to salt stress.Key words: Arabidopsis thaliana, knockout mutants, catalase, proline, sodium chloride.

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