scholarly journals The growth and tissue mineral concentrations of date palm (Phoenix dactylifera L.) cultivars in response to the ultraviolet-B radiation

2020 ◽  
pp. 354-361
Author(s):  
Saeedallah A. Niazwali ◽  
Annadurai Senthilkumar ◽  
Kandhan Karthishwaran ◽  
Mohammed A. Salem
Keyword(s):  
Date Palm ◽  
Growth Parameters ◽  
Principal Component ◽  
Dry Weight ◽  
Genotypic Diversity ◽  
Phoenix Dactylifera ◽  
Ultraviolet B ◽  
Uvb Radiation ◽  
Uvb Exposure ◽  
Mineral Concentrations

The ultraviolet-B (UVB) radiation is an integral part of the sun light and adversely affects the growth and development of date palm (Phoenix dactylifera). Although, date palm is an economically important fruit tree and the majority the world’s production is centered in the Arabian Peninsula, the studies evaluating date palm genotypic diversity and response to the UVB radiation are limited. To investigate this, five commercially grown date palm cultivars were exposed to the control and two elevated levels (four and eight hours per day for one year) of UVB radiations. The results showed that UVB radiation decreased plant height and leaf number by 8-14%, shoot root fresh weight by 66-87% and dry weight by 20-23%, total chlorophyll and carotenoids concentrations by 22-28%, while increased the proline and UVB absorbing compounds (phenolics) by 142% and 17.5%, respectively, across cultivars. These changes were more pronounced under the eight-hour UVB exposure. In general, roots tended to have greater concentrations of S and N by ≈1.4 folds, Co, Na, and P by 3.3-7 folds than shoots, compared to average across cultivars and treatments. However, under UVB, several mineral concentrations were either increased (e.g, Ca, Co, Fe, Mn, P) or decreased (e.g, K, Mo, S, N) consistently in shoots and roots. One exception to this rule was the Na concentration that increased in the shoot (9-45%) but decreased in the roots (8-10%) under UVB. Thus, the response of the date palm cultivars to the UVB was dependent on the measured traits, exhibiting decline in the growth parameters despite the increase in the UVB absorbing compounds and the tissue concentrations of several minerals. The principal component analysis (PCA) showed that the cultivars differed similarly in response to a given level of UVB treatments. Based on the PCA, the cultivars were grouped into two groups as BARHI and FRDWT in one group, while KHD, NBSTF, and RFDRD in other group.

scholarly journals Effects of CO2 concentration and UV-B radiation on date palm (Phoenix dactylifera) grown in open-top chambers

2020 ◽  
pp. 73
Author(s):  
Kandhan Karthishwaran ◽  
Annadurai Senthilkumar ◽  
Wasef Ayed Alzayadneh ◽  
Mohammed Abdul Mohsen Alyafei
Keyword(s):  
Date Palm ◽  
Growth Parameters ◽  
Phoenix Dactylifera ◽  
Ultraviolet B ◽  
Carbon Accumulation ◽  
Cellular Damage ◽  
High Concentration ◽  
Total Carotenoids ◽  
Growth Environment ◽  
Open Top Chambers

Date palm (Phoenix dactylifera L.) is a major plant grown under natural conditions in the Middle East and is subject to multiple environmental stresses. Increased concentration of atmospheric carbon dioxide (CO2) and ultraviolet-B (UV-B) irradiation in the growth environment can have a high impact on plant carbon accumulation, and the various factors can function in opposite directions or cause additive effects. The objective of the present investigation was to screen UAE date palm for susceptibility to elevated level of CO2, UVB and their combined effect on a date palm variety was assessed in transparent open - top chambers (OTC) conditions in the hot climate of UAE. After the screening of the cultivars, experiment was conducted in an OTC facility and the treatments were given for 120 days. After the treatment of the selected cultivar, content of chlorophyll a, b and total, carotenoids, protein, amino acids, phenol and activities including γ-glutamyl kinase, proline oxidase, a-tocopherol and peroxidases activity were determined. The results revealed that the high concentration of CO2 alone increased the growth parameters, whereas the treatment with UV-B significantly affected the growth of the plant relative to regulation. Enzyme observations have shown that an increase in antioxidant enzymes can affect a defense response to the abiotic stress-induced cellular damage. Further extension of this study with other cultivated varieties, other stress parameters and determination of yield parameters will give scope to identify new stress tolerant cultivars of date palm trees.

scholarly journals THE POTENTIAL USE OF Ca(NO3)2 TO IMPROVE SALINITY TOLERANCE IN DATE PALM (Phoenix dactylifera L.)

2021 ◽  
Vol 52 (2) ◽  
pp. 445-453
Author(s):  
Saleh M. Alturki
Keyword(s):  
Date Palm ◽  
Net Photosynthesis ◽  
Dry Weight ◽  
Phoenix Dactylifera ◽  
Inhibitory Effect ◽  
Plant Parts ◽  
Salinity Levels ◽  
Almost All ◽  
Saline Solutions ◽  
The Impact

The study was conducted to investigate the impact of Ca(NO3)2 on  different levels of salt-stress in date palm. Three-years-old date palm plants were subjected to four NaCl levels: 50, 100, 150 and 200 mM. The saline solutions were supplemented with 0, 5, 10 and 20 mM Ca(NO3)2. The combined NaCl/Ca(NO3)2 treatments were conducted over a period of 10 weeks. Control plants were only subjected to the four salinity levels with no Ca (NO3)2 addition. Results showed an inhibitory effect of salinity on almost all plants' parameters under investigation, mainly the accumulation of ions such as N, K, Ca, plant dry weight, chlorophyll and net photosynthesis rate. Addition of Ca (NO3)2 in the solution was more beneficial when added in a moderate concentration (10 mM) compared to lower (5 mM) and higher (20 mM) under all salinity levels. The addition of 10 mM Ca (NO3)2 noticeably enhanced chlorophyll content under 50 mM Na Cl (2.5 mg/100 cm2) and 150 mM NaCl (2 mg/100 cm2). In addition, 10 mM Ca (NO3)2 reduced the accumulation of Na and Cl in plant parts. For instance, in trees subjected to 10 mM Ca (NO3)2, Cl content in leaves and stems under 50 mM Na Cl were 0.23% and 0.65%, respectively. On the other hand, Cl content under 100 mM Na Cl and 200 mM Na Cl were lower compared to their corresponding control treatments. It seems that the use of Ca (NO3)2 had ameliorative effects on salt-stressed date palm plants when used with moderate concentrations.

scholarly journals Determination of Five Mineral Element Contents in Pollen Grains of Different Seedling Date Palm (Phoenix dactylifera L.) Male Trees Grown in Fayoum Governorate, Egypt

2019 ◽  
Vol 7 ◽  
pp. 16-25
Author(s):  
M.A. Seif El-Yazal ◽  
Samir A. Seif El-Yazal
Keyword(s):  
Date Palm ◽  
Pollen Grains ◽  
Dry Weight ◽  
Phoenix Dactylifera ◽  
Pollen Grain ◽  
The Other ◽  
Manganese Concentration ◽  
Regular Component ◽  
Mineral Element ◽  
Study Results

This experiment was conducted to found the connection between sensible male pollinators and the content from mineral element (Zinc, Irion, Manganese, Cupper and Magnesium) in pollen grain of fifty seedling date palm male and compared it with the best selective five seedling date palm males (number 2, 10, 29, 40, 46) are appropriate and promising males for to be utilized in pollinating female date palms and mistreatment in breeding programs in previous study. Results found variations among the categories of pollen and elements. The highest concentration of zinc was found in males' number (2, 10, 40 and 46) which recorded 127,102, 115 and 122 μg/g dry weight respectively as compared to the other male trees. Also the highest concentration of iron was found in male number (40) which recorded 222 μg/g dry weight as compared to the other male trees. Moreover, notes from result excellence male number (10) in manganese concentration which recorded 202 μg/g dry weight as compared to the other male trees. In this concern, pollen grain of date palm male trees contained also, high concentrations of copper and magnesium the concentration ranging from 10 to 30 and 1320 to 1985 μg/g dry weight for copper and magnesium respectively. The best result for copper and magnesium which obtained from the selective male number (46) which recorded 30 and 1985 μg/g dry weight for copper and magnesium respectively as compared to the other male trees. From all the results we can conclude that the date palm pollen grain was as rich source of important minerals, so its suitability as a regular component in plant and human diet.

scholarly journals Melatonin and Its Metabolites Ameliorate UVR-Induced Mitochondrial Oxidative Stress in Human MNT-1 Melanoma Cells

2018 ◽  
Vol 19 (12) ◽  
pp. 3786 ◽  
Author(s):  
Konrad Kleszczyński ◽  
Bernadetta Bilska ◽  
Agatha Stegemann ◽  
Damian Flis ◽  
Wieslaw Ziolkowski ◽  
...  
Keyword(s):  
Oxidative Stress ◽  
Oxidative Phosphorylation ◽  
Melanoma Cells ◽  
Ultraviolet B ◽  
Melatonin Receptors ◽  
Biologically Active ◽  
Uvb Radiation ◽  
Mitochondrial Oxidative Stress ◽  
Uncoupling Of Oxidative Phosphorylation ◽  
Uvb Exposure

Melatonin (Mel) is the major biologically active molecule secreted by the pineal gland. Mel and its metabolites, 6-hydroxymelatonin (6(OH)Mel) and 5-methoxytryptamine (5-MT), possess a variety of functions, including the scavenging of free radicals and the induction of protective or reparative mechanisms in the cell. Their amphiphilic character allows them to cross cellular membranes and reach subcellular organelles, including the mitochondria. Herein, the action of Mel, 6(OH)Mel, and 5-MT in human MNT-1 melanoma cells against ultraviolet B (UVB) radiation was investigated. The dose of 50 mJ/cm2 caused a significant reduction of cell viability up to 48%, while investigated compounds counteracted this deleterious effect. UVB exposure increased catalase activity and led to a simultaneous Ca++ influx (16%), while tested compounds prevented these disturbances. Additional analysis focused on mitochondrial respiration performed in isolated mitochondria from the liver of BALB/cJ mice where Mel, 6(OH)Mel, and 5-MT significantly enhanced the oxidative phosphorylation at the dose of 10−6 M with lower effects seen at 10−9 or 10−4 M. In conclusion, Mel, 6(OH)Mel and 5-MT protect MNT-1 cells, which express melatonin receptors (MT1 and MT2) against UVB-induced oxidative stress and mitochondrial dysfunction, including the uncoupling of oxidative phosphorylation.

Incidence de l'aération sur le traitement par compostage des sous-produits du palmier dattier contaminés parFusarium oxysporumf.sp.albedinis

2005 ◽  
Vol 51 (1) ◽  
pp. 69-77 ◽  
Author(s):  
K Chakroune ◽  
M Bouakka ◽  
A Hakkou
Keyword(s):  
Total Nitrogen ◽  
Date Palm ◽  
Dry Weight ◽  
Initial Mixture ◽  
Phoenix Dactylifera ◽  
The Other ◽  
Mineral Matter ◽  
Other Hand ◽  
Phoenix Dactylifera L ◽  
Cooling Phase

Composting of date palm (Phoenix dactylifera L.) residues contaminated with Fusarium f.sp oxysporum albedinis, causal agent of the vascular wilt (Bayoud) of the date palm, has been achieved. The effect of the aeration of the piles by manual turning has been studied. The maintenance of an adequate humidity of 60%–70%, necessary to the good progress of the composting process, required the contribution of 11.4 L of water/kg of the dried residues. The evolution of the temperatures in the three piles presents the same phases. A latency phase, followed after 2–3 d of composting by a thermophilic phase, which lasts about 24 d, where the temperature remains elevated between 50 and 70 °C. Then a cooling phase that takes about 15 d, during which the temperatures fall to values between 25 and 35 °C, near room temperature. Fusarium f.sp oxysporum albedinis is eliminated completely during the thermophilic phase of composting, and increasing frequencies of turning accelerate its disappearance to a certain extent. On the other hand, pH remained steady and relatively basic oscillating between 8.2 and 8.7. Ninety percent (90%) of the the date palm residues are composed exclusively of organic matters. The total nitrogen represents only 0.4%. The contribution of manure decreases the ratio of carbon to nitrogen (C/N) from 115 to 48 in the initial mixture. After 80 d of composting and according to the frequency of return up, there is a reduction of the granulometry of the substratum, the C/N ratio (from 29% to 44%), the organic matter (from 15% to 23%), the total volume (from 25% to 35%), and of the dry weight of the swaths (from 16% to 24%). On the other hand there is an increase in total nitrogen rate (from 20% to 40%) and in the mineral matter (from 23% to 35%).Key words: composting, palm date, Fusarium oxysporum f.sp. albedinis.

scholarly journals Cell suspension culture as a means to produce polyphenols from date palm (Phoenix dactylifera L.)

2018 ◽  
Vol 42 (5) ◽  
pp. 464-473 ◽  
Author(s):  
Poornananda Madhava Naik ◽  
Jameel Mohammed Al-Khayri
Keyword(s):  
Suspension Culture ◽  
Cell Suspension ◽  
Caffeic Acid ◽  
Cell Suspension Culture ◽  
Date Palm ◽  
Cell Suspension Cultures ◽  
Dry Weight ◽  
Phoenix Dactylifera ◽  
Fresh Weight ◽  
Phoenix Dactylifera L

ABSTRACT Date palm accumulates a wide range of secondary metabolites high in nutritional and therapeutic value. In the present study, date palm (Phoenix dactylifera L., cv. Shaishi) shoot-tip-induced callus was used to establish cell suspension cultures in Murashige and Skoog (MS) liquid medium containing 1.5 mg L-1 2-isopentenyladenine (2iP) and 10 mg L-1 naphthaleneacetic acid (NAA). To study the growth kinetics, cultures were maintained for 12 weeks during which weekly measurements were carried out to determine the biomass accumulation based on packed cell volume (%), fresh weight and dry weight (g). In addition, weekly determination of polyphenols (catechin, caffeic acid, kaempferol, and apigenin) was carried out using high performance liquid chromatography (HPLC). The 11-week-old culture was found highest in the production of biomass (62.9 g L-1 fresh weight and 7.6 g L-1 dry weight) and polyphenols (catechin-155.9 µg L-1, caffeic acid-162.7 µg L-1, kaempferol-89.7 µg L-1, and apigenin-242.7 µg L-1) from the cell suspension cultures. This is the first report on the production of polyphenols from the cell suspension culture of date palm. This study facilitates further development of large-scale production of polyphenols and the utilization of bioreactors.

scholarly journals Spectroscopic and Molecular Methods to Differentiate Gender in Immature Date Palm (Phoenix dactylifera L.)

Plants ◽  
2021 ◽  
Vol 10 (3) ◽  
pp. 536
Author(s):  
Abdul Latif Khan ◽  
Ahmed Al-Harrasi ◽  
Muhammad Numan ◽  
Noor Mazin AbdulKareem ◽  
Fazal Mabood ◽  
...  
Keyword(s):  
Date Palm ◽  
Near Infrared ◽  
Sex Differentiation ◽  
Principal Component ◽  
Phoenix Dactylifera ◽  
Partial Least Square ◽  
Least Square ◽  
Transcript Accumulation ◽  
Near Infrared Reflectance ◽  
Phoenix Dactylifera L

Phoenix dactylifera (date palm) is a well-known nutritious and economically important fruit tree found in arid regions of the Middle East and North Africa. Being diploid, it has extremely high divergence in gender, where sex differentiation in immature date palms (Phoenix dactylifera L.) has remained an enigma in recent years. Herein, new robust infrared (near-infrared reflectance spectroscopy (NIRS) and Fourier transform infrared attenuated total reflectance (FTIR/ATR)) and nuclear magnetic resonance (NMR) spectroscopy methods coupled with extensive chemometric analysis were used to identify the sex differentiation in immature date palm leaves. NIRS/FTIR reflectance and 1H-NMR profiling suggested that the signals of monosaccharides (glucose and fructose) and/or disaccharides (maltose and sucrose) play key roles in sex differentiation. The three kinds of spectroscopic data were clearly differentiated among known and unknown male and female leaves via principal component and partial least square discriminant analyses. Furthermore, sex-specific genes and molecular markers obtained from the lower halves of LG12 chromosomes showed enhanced transcript accumulation of mPdIRDP52, mPdIRDP50, and PDK101 in females compared with in males. The phylogeny showed that the mPdIRD033, mPdIRD031, and mPdCIR032 markers formed distinctive clades with more than 70% similarity in gender differentiation. The three robust analyses provide an alternative tool to differentiate sex in date palm trees, which offers a solution to the long-standing challenge of dioecism and could enhance in situ tree propagation programs.

scholarly journals Almond Consumption Increased UVB Resistance in Healthy Asian Women

2021 ◽  
Vol 5 (Supplement_2) ◽  
pp. 319-319
Author(s):  
Susanne Henning ◽  
Jason Li ◽  
Gail Thames ◽  
Omar Bari ◽  
Patrick Tran ◽  
...  
Keyword(s):  
Skin Aging ◽  
Ultraviolet B ◽  
In Vivo Studies ◽  
Asian Women ◽  
Skin Extract ◽  
Uvb Radiation ◽  
Facial Skin ◽  
Uvb Exposure

Abstract Objectives Almonds are a rich source of phenolic and polyphenolic compounds, which have antioxidant activity. In vitro and in vivo studies have demonstrated that topical application of almond oil and almond skin extract reduces UVB-induced photoaging. Ultraviolet-B (UVB) protection by oral almond consumption has not been previously studied in humans. It was the objective to investigate whether oral almond consumption can increase resistance to UVB radiation and reduce skin aging in healthy Asian women. Methods Thirty-nine female participants (18–45 years) with Fitzpatrick skin type II-IV were randomly assigned to consume either 1.5 oz of almonds or 1.8 oz of pretzels daily for 12 weeks. Minimal erythema dose (MED) was determined using a standardized protocol, which determined the minimal radiation inducing erythema on the inner arm 24 hours following UVB exposure. Facial skin texture was evaluated by two dermatologists using the Clinician's Erythema Assessment scale and Allergan Roughness scale. Facial melanin index, hydration, sebum, and erythema were determined using a cutometer. Results Women who consumed almonds, experienced a significant increase in MED from 415 ± 64 to 487 ± 59 (18.7 ± 19.2%, P = 0.006) from baseline to week 12 compared to women in the pretzel group from 415 ± 67 to 421 ± 67 (1.8 ± 11.1%). The exposure time to reach minimal erythema was also increased significantly in the almond group from 160 ± 23 to 187 ± 25 (17.5 ± 22.2%) compared to the pretzel group from 165 ± 27 to 166 ± 25 (1.7 ± 14%) (p=0.026). There were no differences noted between the groups consuming almonds versus pretzels in Allergan roughness, melanin, hydration, or sebum on facial skin. Conclusions Our findings suggest that daily oral almond consumption may lead to enhanced protection from UVB photodamage by increasing the MED. Protection from other UV radiation was not tested and therefore almond consumption will not replace other methods of sun protection such as application of sunscreen or wearing protective closing. Funding Sources Almond Board of California.

scholarly journals MORIN PREVENTS ULTRAVIOLET-B RADIATION-INDUCED PHOTOCARCINOGENESIS THROUGH ACTIVATING THROMBOSPONDIN-1 IN THE MOUSE SKIN

2018 ◽  
Vol 11 (3) ◽  
pp. 171
Author(s):  
Anjugam C ◽  
Sridevi M ◽  
Rajendra Prasad N ◽  
Agilan Balupillai
Keyword(s):  
Growth Factor ◽  
Transforming Growth Factor Beta ◽  
Transforming Growth Factor ◽  
Mouse Skin ◽  
Ultraviolet B ◽  
Uvb Radiation ◽  
Thrombospondin 1 ◽  
Radiation Induced ◽  
Cox 2 ◽  
Uvb Exposure

 Objective: In this study, we investigated whether morin, a natural flavonoid, could able to inhibit ultraviolet B (UVB)-induced carcinogenesis in the skin of Swiss albino mice.Methods: The mice were exposed to UVB radiation (180 mJ/cm2) on weekly thrice for 30 weeks, and morin was administered intraperitoneal and topical application 1 h before UVB exposure. UVB radiation induces the overexpression of cyclooxygenase-2 (COX-2), inducible nitric oxide synthase (iNOS), vascular endothelial growth factor (VEGF), transforming growth factor-beta (TGF-β), and Bcl-2 genes.Results: Morin significantly prevented UVB-induced activation of COX-2, iNOS, VEGF, TGF-β, and Bcl-2 expression in mouse skin. Thrombospondin-1 (TSP), a novel endogenous factor, inhibits angiogenesis and inflammation.Conclusion: The present study illustrates that the protective effect of morin against UVB-induced carcinogenesis may be modulated through activation of TSP-1 in UVB-exposed Swiss albino mice.

scholarly journals Nutrient Diagnosis Norms for Date Palm (Phoenix dactylifera L.) in Tunisian Oases

Agronomy ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 886
Author(s):  
Mouna Bendaly Labaied ◽  
Lotfi Khiari ◽  
Jacques Gallichand ◽  
Fassil Kebede ◽  
Nabila Kadri ◽  
...  
Keyword(s):  
Date Palm ◽  
Phoenix Dactylifera ◽  
High Yield ◽  
Maturity Stage ◽  
Nutrient Contents ◽  
Nutrient Imbalances ◽  
Phoenix Dactylifera L ◽  
Mineral Concentrations ◽  
Nutritional Imbalance

Several studies have pointed out the promising use of nutritional diagnosis methods for the determination of optimum nutrient contents in plant tissues. The present investigation was carried out in different oases in Southern Tunisia to determine reference values for the interpretation of leaf analyses of date palm (Phoenix dactylifera) Deglet Nour cultivar with the Critical Value Approach (CVA) and the Compositional Nutrient Diagnosis (CND). A database (n = 100) of yield and mineral concentrations taken from date palm leaflets in October, at the maturity stage of dates, was used. The yield cut-off between low-yield and high-yield subpopulations, selected from cumulative variance ratio functions across survey data, was 76 kg palm−1 and the global nutrient imbalance index (CNDr2) was 10.06. Critical CND nutrient indices were found to be symmetrical around zero as follows: (1.59; +1.59) for IN, (−0.44, +0.44) for IP, (−0.63, +0.63) for IK, (−0.94, +0.94) for ICa, (−1.05, +1.05) for IMg, (−0.80, +0.80) for IFe, (−0.74, +0.74) for ICu, (−0.80, +0.80) for IB, (−0.93, +0.93) for IZn, (−1.04, +1.04) for IMn, and (−1.03, +1.03) for the residual value. Compared to CND, the CVA approach shows weak detection of the nutrients that cause nutritional imbalance. CND indices revealed, except for N, the presence of nutrient imbalances and the necessity to correct the mineral nutrition of date palm in the Kebeli oases.

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