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Jana GA, Krishnamurthy P, Kumar PP, Yaish MW. Functional characterization and expression profiling of glyoxalase III genes in date palm grown under abiotic stresses. Physiol Plant 2021; 172:780-794. [PMID: 33034392 DOI: 10.1111/ppl.13239] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2020] [Revised: 09/22/2020] [Accepted: 10/06/2020] [Indexed: 06/11/2023]
Abstract
Methylglyoxal (MG), a by-product of various metabolic processes, including glycolysis, is a highly reactive cytotoxic metabolite. The level of MG in the cell is maintained at a non-toxic level via MG detoxification pathways such as the universal glyoxalase system, including glyoxalase I/II/III enzymes. Glyoxalase III (DJ-1) can breakdown MG to d-lactate in a single step without reducing glutathione (GSH). Elucidating the function of the DJ-1 gene family may provide further knowledge about its role in plants under abiotic stresses. Here, we characterize four glyoxalase III genes (PdDJ-1B1, PdDJ-1B2, PdDJ-1C, and PdDJ-1D) encoding the conserved DJ-1 domain in the genome of the date palm, a crop with high drought and salinity tolerance. The expression level of the PdDJ-1 genes increased in date palm leaves upon salinity treatment. In addition, overexpression of PdDJ-1 genes in Escherichia coli and the complementation in yeast hsp31Δ knockout mutant cells enhanced their growth rate and reduced the accumulation of reactive oxygen species (ROS) under MG and oxidative stress conditions as shown by the flow cytometry assay. Subcellular localization using confocal microscopy revealed the accumulation of PdDJ-1B1, PdDJ-1C, and PdDJ-1D in the chloroplast, whereas PdDJ-1B2 was localized to the cytosol. Remarkably, constitutive expression of the PdDJ-1C gene in Arabidopsis thaliana Columbia (Col-0) resulted in the generation of non-viable albino plants implying that PdDJ-1C plays a critical function in chloroplast development. These findings suggest that PdDJ-1 protein has an important function in MG-detoxification and maintaining the redox balance in date palm plants under abiotic stress conditions.
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Affiliation(s)
- Gerry A Jana
- Department of Biology, College of Sciences, Sultan Qaboos University, Muscat, Oman
| | - Pannaga Krishnamurthy
- Department of Biological Sciences, Faculty of Science, National University of Singapore, Singapore, Singapore
| | - Prakash P Kumar
- Department of Biological Sciences, Faculty of Science, National University of Singapore, Singapore, Singapore
| | - Mahmoud W Yaish
- Department of Biology, College of Sciences, Sultan Qaboos University, Muscat, Oman
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Sh Shawky A, S Abbas M, Rabie SMH, Assous MTM, Mostafa Zeinab MA. Impact of Pretreatments and Drying Temperatures on Quality of Siwi and Sakkoti Dates. Pak J Biol Sci 2020; 23:658-666. [PMID: 32363822 DOI: 10.3923/pjbs.2020.658.666] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND AND OBJECTIVE Drying of date helps in preserving it to be consumed outside the harvest season and removes some moisture from dates and also slows down the action of date endogenous enzymes. This study was carried out to investigate pretreatments and drying temperature on the physical and chemical properties of 2 date varieties (Siwi and Sakkoti) at the khalal stage. MATERIALS AND METHODS The date fruits at khalal stage were dipped in ascorbic acid solution, sodium metabisulfite solution and sulfur dioxide before cut into pieces, halves and as whole. Then dates were dried at 50, 55, 60 and 65°C, respectively till ~20% moisture content and examined the physical and chemical properties of dried dates. RESULTS Moisture content of Siwi and Sakkoti at the khalal stage was 56.90 and 51.72%, respectively, while total sugars were 79.76 and 75.74%, respectively on dry weight bases. The color of dates Hunter (L and b) were the highest of treated with meta-bisulfate solution or sulfur dioxide and the lowest of color date observed (Hunter, a) comparing with control and ascorbic acid. CONCLUSION The pretreatments indicated that the dipping dates in sodium meta-bisulfate solution or sulfur dioxide then, dried at 60˚C produce high quality parameters of semi-dry dates comparing control and ascorbic acid.
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El Abed H, Khemakhem B, Fendri I, Chakroun M, Triki M, Drira N, Mejdoub H. Extraction, partial purification and characterization of amylase from parthenocarpic date (Phoenix dactylifera): effect on cake quality. J Sci Food Agric 2017; 97:3445-3452. [PMID: 28070892 DOI: 10.1002/jsfa.8198] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Revised: 12/30/2016] [Accepted: 12/31/2016] [Indexed: 06/06/2023]
Abstract
BACKGROUND Phoenix dactylifera L. plays an important role in social, economic and ecological Tunisian sectors. Some date palms produce parthenocarpic fruit named Sish. The objective of the present study was to extract biomolecules from parthenocarpic fruit by producing value-added products from the fruits. RESULTS The extraction of amylolytic activity from parthenocarpic fruit (AmyPF) was optimized using Box-Behnken design (BBD). Partial purification of about 250-fold with an activity yield of 47% was achieved. The amylase exhibited a specific activity of 80 U mg-1 protein. The optimum pH and temperature for enzyme activity were 5 and 55 °C respectively. The enzyme was highly active over a wide range of pH (5-10), and significant stabilization was observed at 60 °C. The purified enzyme belongs to the exo type of amylases. Given the economic and industrial relevance of amylases used in the food industry, three different concentrations of AmyPF (0.007, 0.014 and 0.018 U g-1 ) were incorporated into a cake formulation, resulting in a decrease in density, moisture retention and water activity and an increase in hardness. CONCLUSION The beneficial effect of AmyPF on the technological characteristics of cakes was confirmed by sensory evaluation. © 2017 Society of Chemical Industry.
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Affiliation(s)
- Hanen El Abed
- Laboratory of Plant Biotechnology, Faculty of Sciences of Sfax, University of Sfax, Sfax, Tunisia
| | - Bassem Khemakhem
- Laboratory of Plant Biotechnology, Faculty of Sciences of Sfax, University of Sfax, Sfax, Tunisia
| | - Imen Fendri
- Laboratory of Toxicology, Environmental Microbiology and Health, Faculty of Sciences of Sfax, University of Sfax, Sfax, Tunisia
| | - Mouna Chakroun
- Laboratory of Plant Biotechnology, Faculty of Sciences of Sfax, University of Sfax, Sfax, Tunisia
| | - Mehdi Triki
- Food Analysis Laboratory, National School of Engineers of Sfax, University of Sfax, Sfax, Tunisia
| | - Noureddine Drira
- Laboratory of Plant Biotechnology, Faculty of Sciences of Sfax, University of Sfax, Sfax, Tunisia
| | - Hafedh Mejdoub
- Laboratory of Plant Biotechnology, Faculty of Sciences of Sfax, University of Sfax, Sfax, Tunisia
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Zayneb C, Imen RH, Walid K, Grubb CD, Bassem K, Franck V, Hafedh M, Amine E. The phytochelatin synthase gene in date palm (Phoenix dactylifera L.): Phylogeny, evolution and expression. Ecotoxicol Environ Saf 2017; 140:7-17. [PMID: 28231507 DOI: 10.1016/j.ecoenv.2017.02.020] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2016] [Revised: 02/11/2017] [Accepted: 02/13/2017] [Indexed: 06/06/2023]
Abstract
We studied date palm phytochelatin synthase type I (PdPCS1), which catalyzes the cytosolic synthesis of phytochelatins (PCs), a heavy metal binding protein, in plant cells. The gene encoding PdPCS1 (Pdpcs) consists of 8 exons and 7 introns and encodes a protein of 528 amino acids. PCs gene history was studied using Notung phylogeny. During evolution, gene loss from several lineages was predicted including Proteobacteria, Bilateria and Brassicaceae. In addition, eleven gene duplication events appeared toward interior nodes of the reconciled tree and four gene duplication events appeared toward the external nodes. These latter sequences belong to species with a second copy of PCs suggesting that this gene evolved through subfunctionalization. Pdpcs1 gene expression was measured in seedling hypocotyls exposed to Cd, Cu and Cr using quantitative real-time polymerase chain reaction (qPCR). A Pdpcs1 overexpression was evidenced in P. dactylifera seedlings exposed to metals suggesting that 1-the Pdpcs1 gene is functional, 2-there is an implication of the enzyme in metal detoxification mechanisms. Additionally, the structure of PdPCS1 was predicted using its homologue from Nostoc (cyanobacterium, NsPCS) as a template in Discovery studio and PyMol software. These analyses allowed us to identify the phytochelatin synthase type I enzyme in date palm (PdPCS1) via recognition of key consensus amino acids involved in the catalytic mechanism, and to propose a hypothetical binding and catalytic site for an additional substrate binding cavity.
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Affiliation(s)
- Chaâbene Zayneb
- Laboratory of Plant Biotechnology, Faculty of Sciences, University of Sfax, BP 1171, 3000 Sfax, Tunisia; Laboratoire de Génie Civil et géo-Environnement, Université de Lille 1, F-59655 Villeneuve d'Ascq, France
| | - Rekik Hakim Imen
- Laboratory of Plant Biotechnology, Faculty of Sciences, University of Sfax, BP 1171, 3000 Sfax, Tunisia
| | - Kriaa Walid
- Laboratory of Plant Biotechnology, Faculty of Sciences, University of Sfax, BP 1171, 3000 Sfax, Tunisia
| | - C Douglas Grubb
- Biorecycling Operations Research Laboratory, Des Moines, IA, USA
| | - Khemakhem Bassem
- Laboratory of Plant Biotechnology, Faculty of Sciences, University of Sfax, BP 1171, 3000 Sfax, Tunisia
| | - Vandenbulcke Franck
- Laboratoire de Génie Civil et géo-Environnement, Université de Lille 1, F-59655 Villeneuve d'Ascq, France
| | - Mejdoub Hafedh
- Laboratory of Plant Biotechnology, Faculty of Sciences, University of Sfax, BP 1171, 3000 Sfax, Tunisia
| | - Elleuch Amine
- Laboratory of Plant Biotechnology, Faculty of Sciences, University of Sfax, BP 1171, 3000 Sfax, Tunisia.
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Zouari M, Ben Ahmed C, Zorrig W, Elloumi N, Rabhi M, Delmail D, Ben Rouina B, Labrousse P, Ben Abdallah F. Exogenous proline mediates alleviation of cadmium stress by promoting photosynthetic activity, water status and antioxidative enzymes activities of young date palm (Phoenix dactylifera L.). Ecotoxicol Environ Saf 2016; 128:100-8. [PMID: 26901506 DOI: 10.1016/j.ecoenv.2016.02.015] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2015] [Revised: 01/29/2016] [Accepted: 02/12/2016] [Indexed: 05/22/2023]
Abstract
The ability of exogenous compatible solutes, such as proline, to counteract cadmium (Cd) inhibitory effects in young date palm plants (Phoenix dactylifera L. cv Deglet Nour) was investigated. Two-year-old date palm plants were subjected for five months at different Cd stress levels (0, 10 and 30 mg CdCl2 kg(-1) soil) whether supplied or not with exogenous proline (20mM) added through the irrigation water. Different levels of Cd stress altered plant growth, gas exchanges and chlorophyll content as well as water status, but at different extent among them. In contrast, an increase of antioxidant enzymes activities of Cd-treated plants in association with high amounts of proline content, hydrogen peroxide (H2O2), thiobarbituric acid reactive substances (TBARS) and electrolyte leakage (EL) were observed. Interestingly, exogenous proline mitigated the adverse effects of Cd on young date palm. Indeed, it alleviated the oxidative damage induced by Cd accumulation and established better levels of plant growth, water status and photosynthetic activity. Moreover, proline-treated plants showed high antioxidant enzymes activities (superoxide dismutase, catalase and glutathione peroxydase) in roots and leaves as compared to Cd-treated plants.
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Affiliation(s)
- M Zouari
- Laboratory of Plant Biodiversity and Dynamics of Ecosystems in Arid Area, Faculty of Sciences of Sfax, University of Sfax, Tunisia; Laboratory of Improvement of Olive Productivity and Fruit Trees, Olive Tree Institute of Sfax, Tunisia; University of Limoges, Faculty of Pharmacy, FR 3503 GEIST, GRESE EA 4330 - Laboratory of Botany and Cryptogamy, 87025 Limoges Cedex, France.
| | - Ch Ben Ahmed
- Laboratory of Plant Biodiversity and Dynamics of Ecosystems in Arid Area, Faculty of Sciences of Sfax, University of Sfax, Tunisia; Laboratory of Improvement of Olive Productivity and Fruit Trees, Olive Tree Institute of Sfax, Tunisia
| | - W Zorrig
- Laboratory of Extremophile Plants, Centre of Biotechnology of Borj-Cedria, Hammam-Lif, Tunisia
| | - N Elloumi
- Laboratory of Plant Biodiversity and Dynamics of Ecosystems in Arid Area, Faculty of Sciences of Sfax, University of Sfax, Tunisia
| | - M Rabhi
- Laboratory of Extremophile Plants, Centre of Biotechnology of Borj-Cedria, Hammam-Lif, Tunisia
| | - D Delmail
- Institute of Chemical Sciences of Rennes, CNRS UMR 6226, University of Rennes 1, 2 Avenue of Professor Léon Bernard, F-35043 Rennes, France
| | - B Ben Rouina
- Laboratory of Improvement of Olive Productivity and Fruit Trees, Olive Tree Institute of Sfax, Tunisia
| | - P Labrousse
- University of Limoges, Faculty of Pharmacy, FR 3503 GEIST, GRESE EA 4330 - Laboratory of Botany and Cryptogamy, 87025 Limoges Cedex, France.
| | - F Ben Abdallah
- Laboratory of Plant Biodiversity and Dynamics of Ecosystems in Arid Area, Faculty of Sciences of Sfax, University of Sfax, Tunisia
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