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Все статьи: 1049
Effects of water stress on rice production: bioavailability of potassium in soil
Статья научная
Water demand in agriculture, municipal, and industrial purposes is increasing rapidly which will pressure on future demand in agriculture. To justify less water use in rice production, we produced rice under different water levels (DWLs) and justified potassium bioavailability. There were five DWLs were employed in this experiment. Besides measuring yield and yield parameters, relative water content (WRC) and chlorophyll content in leaves, soil pH and bioavailability of potassium (K) in soil solution were measured. Yield and yield parameters showed insignificant difference under DWLs. Different water levels did not affect weekly data of chlorophyll content and RWC in leaves. But chlorophyll content and RWC in leaves were significantly higher in week 6 or 9 than week 3. Different water levels did not affect soil pH. Our results suggest that rice can be produced under low water input without affecting yield and yield parameters and K bioavailability in soil.
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Efficacy of spermine foliar application in delaying senescence of the fourth youngest leaf in wheat
Статья научная
The objective of this study is to elucidate the role of exogenously applied spermidine (Spm) in delaying both naturally and drought-induced senescence in the fourth youngest leaf of wheat, thereby helping it remain in a vegetative state for as long as possible. Wheat seedlings were grown until the emergence of the fourth youngest leaf (30 days after sowing, DAS) and then subjected to drought stress up to the 50th DAS. This leaf, which undergoes natural senescence due to aging, showed further signs of decline under drought conditions, including reductions in growth parameters, starch content, and the levels of CaІ⁺ and K⁺, along with increases in Na⁺ and soluble sugars content. Additionally, catalase isozyme expression varied significantly, while five distinct peroxidase isozymes were observed, depending on age and drought exposure. Concurrently, chloroplast ultrastructure exhibited notable alterations, such as reduced volume and a more spherical shape, diminished thylakoid membranes, increased diameter and number of plastoglobuli, disappearance of starch grains, stacking and bending of lamellae, thickening of the cell wall, and greater distance between chloroplasts and the cell wall. However, foliar application of Spm mitigated the adverse effects of senescence on growth parameters, carbohydrates, ion content, and isozyme expression of both catalase and peroxidase. It also improved chloroplast structure, as indicated by the chloroplasts’ restored elliptical shape, proximity to the cell wall, and reappearance of starch grains. These findings suggest that Spm can counteract the negative impacts of leaf senescence in wheat, significantly delaying the onset of senescence and helping the fourth leaf maintain its vegetative status. This delay could contribute to enhanced productivity by modulating key metabolites, ions, and chloroplast structure.
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Efficiency of priming methods in crop establishment of ginger (Zingiber officinale Rosc.)
Статья научная
The present research work was conducted to evaluate the effect of different priming methods on Zingiber officinale Rosc. variety Karthika. Hydropriming was done by immersing the ginger rhizomes in distilled water for varied time durations (6, 12, 24, 36 and 48 hour), and for halopriming different concentrations (50mM,100mM, 250mM and 500mM) of sodium chloride (NaCl) solution was used for different time durations (6, 12, 18 and 24 hour). The primed plants showed fast germination than unprimed ones. The germination percentage of haloprimed (50 mM NaCl for 24 hour) plants was 89.22% and in hydropriming it was 90.33% (24 hours). But in the case of unprimed (control) plants, the germination percentage was only 55.11%. The present study showed that the optimum time duration for priming in ginger was 24 hours. In halopriming, the growth was highest in 50 mM NaCl for 24 hours. The carbohydrate content and photosynthetic pigment content were highest in primed plants when compared to unprimed plants.When comparing both priming methods, the haloprimed plants showed highest chlorophyll content and carbohydrate content than the hydroprimed ones. But, regarding the yield, hydroprimed plants produced more tillers and thus more yield. Since, ginger is cultivated for mainly for the rhizomes, among the two priming methods investigated, hydropriming was found to be more promising than halopriming in terms of yield.
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![Efficient somatic embryogenesis and plantlet regeneration induced from mature embryo culture under heavy metals stress conditions in a millet crop sorghum [Sorghum bicolor (L.) Moench]](/file/thumb/143183772/efficient-somatic-embryogenesis-and-plantlet-regeneration-induced-from-mature.png "Efficient somatic embryogenesis and plantlet regeneration induced from mature embryo culture under heavy metals stress conditions in a millet crop sorghum [Sorghum bicolor (L.) Moench]")
Статья научная
The present study aims to establish the somatic embryogenesis and plantlet regeneration in Sorghum bicolor ( cv. PAC501) under heavy metals (lead and cadmium) stress conditions. Mature embryos were inoculated in MS-medium containing (10mg/L, 25mg/L, 50mg/L, 75mg/L, and 100mg/L) of PbSO4 and CdCl2 (10mg/L, 25mg/L, 50mg/L, 75mg/L, 100mg/L, 150mg/L, and 200mg/L) each with IAA (1.0mg/L), BAP (0.5mg/L), zeatin (0.1mg/L), and proline (0.7mg/L). Significantly, high frequency (87.2±0.21%) of somatic embryogenesis was initially obtained with IAA (1.0mg/L), BAP (0.5mg/L), zeatin (0.1mg/L), and proline (0.7mg/L) while in comparison, 2,4-D (2.5mg/L) along with same concentrations of BAP, zeatin, and proline was proved as relatively less efficient (67.4±0.64%) for somatic embryogenesis. Furthermore, results reveal that sub-culture of embryogenic callus on cytokinins; BAP, Kn, and Zn (0.1mg/L, 0.5mg/L, and 1.0mg/L) of each added regeneration medium, kinetin (0.5mg/L) was recorded as the most effective cytokinin (77.8±0.93%) for plantlets regeneration. Moreover, during heavy metals treatments, the least frequency (2.9±3.32%) of lead tolerant somatic embryos was obtained with PbSO4 (75mg/L) in presence of the same concentrations of IAA, BAP, zeatin, and proline. Significantly, the very low frequency (3.7±0.67%) of lead tolerant plantlets regeneration was recorded with PbSO4 (75mg/L) and Kn (0.5mg/L). In contrast, during CdCl2 stress treatment, the cadmium tolerant somatic embryos (3.1±3.24%) were obtained with CdCl2 (150mg/L) and IAA, BAP, zeatin, and proline. Further, cadmium tolerant plantlets (4.23±2.33%) were also achieved on medium containing kinetin (0.5mg/L) with CdCl2 (100mg/L) indicating that lead proves to be more toxic for somatic embryogenesis and plantlets regeneration than cadmium. Later, the regenerated tolerant plantlets were transferred to pots and gradually acclimatized in greenhouse.
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Статья научная
Worldwide warming is anticipated to have a typically terrible impact on plant development because of the harmful impact of excessive temperatures on plant improvement. Plants' diversity and productivity are adversely suffering from abiotic environmental factors. Thermal /heat stress is now becoming the main concern for plants everywhere, Major reason behind this is sudden changes in weather and climate which affects medicinal plants around the world and will eventually cause the destruction of some key species. The growing risk of climatological extremes such as very excessive temperatures might result in a catastrophic lack of crop productiveness and bring about extensive famine. Within the boom situation of plant life, several secondary metabolites are produced with the aid of them to serve a ramification of cell capabilities vital for physiological approaches, and the latest growing proof has implicated stress reaction. The medicinal plants comprise bioactive PSNPs, which perform a key role in plant life with the altering environment and stress condition. Within past decades, various studies advertised the healing properties and biological activities of medicinal plants. Excessive levels of pressure in medicinal vegetation exploitation caused by abiotic stress outcomes with the production of ROS inside the cell chambers of a plant cell which ultimately have a tremendous effect on secondary metabolite production. In this article, we have focused on what is the role of secondary metabolite and ROS generation in protecting the plant under the high stressful condition of heat.
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Статья научная
Rauwolfia serpentina (Apocynaceae) is a woody perennial shrub and important medicinal plant. Due to increased interest by both the scientific community regarding the medicinal uses of this plant species, a protocol for in vitro callus induction of Rauwolfia has been developed due to low germination rate (15%-20%). The leaf and stem explants were transferred to MS medium containing different combinations of plant growth hormones; 2,4-dichlorophenoxyacetic acid (2,4-D) + 2-benzyl amino purine (BAP).The concentration of 2,4-D (2.0mg/l) + BAP (1.0 mg/l) produced better results for callus induction in both leaf and stem explants. The least results were recorded in callus induced from leaf explants under the influence of 2, 4-D (2.0 mg/l) and BAP (1.5 mg/l). The present investigation aims to increase the phenolic content in vitro responsible for the antioxidant activity of Rauwolfia. Thus salinity stress has been applied in vitro to increase the phenolic acid content and various enzymes such as SOD (superoxide dismutase) and PAL (Phenyl alanine ammonia lyase) has been studied. The phenolics content was more in leaf callus at moderate salinity level of 15 ppm compared to control and other treatments at 10ppm and 20 ppm. There was increase in total phenolic acid content and antioxidant activity of Rauwolfia under moderate salinity. Result of the experiment showed that the SOD activity was highest at 20ppm followed by 15 ppm and 10 ppm salt treatment. Activities of PAL in the callus increased progressively with the increasing salt concentrations. Increased PAL activity in the leaf callus was linearly and positively correlated with increasing NaCl concentrations and the peak activity in the leaf callus was observed at NaCl concentration of 20 ppm.
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Elucidating the mechanism of anti-apoptotic activity of а-crystallin and its therapeutic potential
Статья обзорная
Α- Crystallins are the structural proteins of the eye lens which possess anti-apoptotic activity. Both αA- and αB- crystallins are distinct antiapoptotic regulators which can interact with Bax and Bcl-XS, proapoptotic members of the Bcl-2 family in order to sequester their translocation into the mitochondria. Thus they may interfere with the mitochondrial apoptotic pathway which triggers Bax pro-apoptotic activity and the downstream activation of effector caspases such as Caspase-9 and Caspase-3. The differential regulation of α- crystallins has been observed in several ocular diseases such as age-related macular degeneration and many others. Crystallins interact with pro-apoptotic Bax and displayed cytoprotection against Bax-triggered apoptosis. αA-crystallin was found to inhibit chemical-induced apoptosis by inhibiting the activation of caspase-3 and caspase-9. Its antiapoptotic activity was found to be directly related to its chaperone activity. On the other hand, αB- crystallin associated with IKK-β activates its kinase activity which in turn, leads to the activation of NF- ĸB; this activation protects myoblasts from tumor necrosis factor-α (TNF-α) - induced cytotoxicity by enhancing the expression of Bcl-2, an anti-apoptotic protein. The anti- apoptotic mechanisms may be exploited for therapeutic purposes in near future.
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Статья научная
This paper is the first in a series reporting a study on the effects of different concentrations of insecticide, Endosulfan (0-600ppm) was premeditated on 5th day after insecticide exposure with respect to growth rate, pigment composition and photosynthetic activity of Azolla microphylla under laboratory conditions which become non-target organism in the rice fields. Endosulfan inhibited the relative growth rate, pigment content and photosynthetic O2 evolution. Phycocyanin was main target followed by carotenoid and total chlorophyll. Significant increase in pigment, flavonoid and Anthocyanin was noticed after six days of treatment. In contrast to the photosynthetic activity, the rate of respiration in Azolla microphylla was increased significantly. Our results show that Endosulfan at normally recommended field rates and intervals are seldom deleterious to the beneficial and Eco friendly Azolla microphylla and their activities and thus in turn suppress plant growth and development. Phytotoxity of Azolla microphylla can be minimized by restrictions on application, timing, method and rate of application.
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Статья научная
In the era of sustainable development, phytoremediation has emerged as a promising, eco-friendly strategy for reclaiming heavy metal-contaminated environments. This study explores the phytoremediation potential of Alternanthera ficoidea for cadmium (Cd) and lead (Pb) and investigates the role of beneficial microbes-Azotobacter sp., Pseudomonas fluorescens, and Trichoderma viride-in enhancing metal uptake. Remarkably, the roots of plants treated with Cd + Azotobacter sp. exhibited a 173% increase in Cd accumulation compared to Cd-only treatments. Even more striking, Cd accumulation in the shoots surged by 1025% in plants treated with Cd + T. viride. Conversely, microbial inoculation significantly reduced Pb accumulation in both roots and shoots of A. ficoidea. Bioaccumulation (BCF) and translocation factor (TF) analyses revealed that microbial augmentation, particularly with Azotobacter sp., enhanced the phytostabilization capacity of A. ficoidea for Cd. Additionally, the species demonstrated inherent potential for Pb phytostabilization. These findings underscore the synergistic benefits of combining phytoremediation with microbial assistance for the sustainable detoxification of heavy metal-laden soils.
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Статья научная
The objectives of this work were to fabricate the nanocomposite zinc oxide/silicon dioxide/graphene oxide (ZnO/SiO₂/GO) by decorating ZnO nanoparticles (NPs) and SiO₂ NPs onto graphene oxide (GO), aiming for efficient enhancement of the photosynthetic capacity of quinoa grown under high NaCl conditions. The nanocomposite was characterized by an absorption peak at 354 nm, spherical particles averaging 44.57 nm in diameter, and a surface charge of +34.28 ± 4.1 mV. Seeds were soaked in the nanocomposite and germinated in pots treated with NaCl at concentrations of 200 mM, 400 mM, and 500 mM. High salinity significantly reduced photosynthetic pigments, gas exchange parameters [net photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (E), and water use efficiency (WUE)], chlorophyll fluorescence parameters [minimum fluorescence (F₀), maximum fluorescence (Fm), variable fluorescence (Fv), maximum efficiency of PSII (Fv/Fm), maximum fluorescence yield (Fm'), photochemical efficiency of PSII in the light (Fv’/Fm’), PSII efficiency (ΦPSII), and electron transport rate (ETR)], and activities of photosynthetic enzymes [ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco), glyceraldehyde-3-phosphate dehydrogenase (GAPDH), triose phosphate isomerase (TPI), fructose 1,6-bisphosphate aldolase (FBPA), sedoheptulose 1,7-bisphosphatase (SBPase), and phosphoribulokinase (PRK)]. Conversely, intercellular CO₂ concentration (Ci), nonphotochemical quenching (NPQ), and photochemical quenching (qP) increased under salinity. Application of the fabricated nanocomposite effectively mitigated the NaCl-induced deterioration of all tested parameters, restoring them close to control levels. These findings demonstrate that although high NaCl levels impair photosynthetic parameters, the nanocomposite supports photosynthesis, indicating its safe and effective use in enhancing quinoa’s photosynthetic capacity under high salinity and improving the performance of the photosynthetic apparatus.
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Enzyme activity and seedling growth of soybean seeds under accelerated aging
Статья научная
Seed aging is the main problem of seed storage. Changes of bio-chemical and reduction of seedling growth are consequence of seed deterioration. An experiment was conducted to evaluate the effects of accelerated aging on soybean seed germination indexes and enzyme activity. Seeds were incubated in closed plastic boxes for the accelerated aging treatments. Three accelerate aging regimes were performed by placing seeds at 41°C and relative humidity (RH) of 90-100 % for 0, 2, 4, 6 and 8 days periods. Our results showed that increasing aging duration resulted higher reduction in germination characteristics, catalase and ascorbate peroxidase. Germination percentage, means time to germination, germination index, normal seedling percentage and enzyme activity decrease significantly.
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Enzyme activity, hormone concentration in tree shrew (Tupaia belangeri) during cold acclimation
Статья научная
Environmental factors play an important role in the seasonal adaptation of body mass and thermogenesis in wild small mammals. The tree shrew (Tupaia belangeri), is a unique species of small mammals which is origin of island in the Oriental realm. The present study was to test the hypothesis that ambient temperature was a cue to induce adjustments in body mass, energy intake, metabolism, uncoupling protein 1 (UCP1) in brown adipose tissue (BAT), and other biochemical characters of T. belangeri during cold exposure about 21 days. Our data demonstrate that cold acclimation induced a remarkable increase in body mass, a significant increase in energy intake and metabolic rate, and high expression of UCP1 in BAT of T. belangeri. Cold acclimation induced an increase in cytochrome c oxidase (COX) and Thyroidhormones (T3/T4). These data supported that T. belangeri increased the body mass and increased energy intake and expenditure under cold acclimation. Increased expression of UCP1 was potentially involved in the regulation of energy metabolism and thermogenic capacity following cold acclimation. And it through changes in enzyme activity and hormone concentration under cold acclimation, and suggested temperature changes play an important role in the regulation of thermogenic capacity in tree shrew.
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Статья научная
Background: The objective of the present study was to investigate the ability of butanolic extract from leaves of Chrysanthemum fontanesii, vitamin E and C to modulate ethanol-Induced toxicity and oxidation damage in maternal and fetal tissues of mice. Butanolic extract from leaves of Chrysanthemum fontanesii (200 mg/Kg per day), vitamin E (100mg/Kg per day) and C (8.3mg/Kg per day) were administered by gavage to groups of pregnant mice from the 6 th to 17 th day of gestation. A number of animals received plant extract, vitamin E and C, also treated with an oral administration of ethanol (0.02ml/g of 25% v/v absolute ethanol in water per day) in same conditions. On day 18 of gestation, pregnant mice were killed, fetus, placenta, fetal liver, liver, kidneys and brain were removed, homogenised and used for determination of lipid peroxidation (LPO) using TBARS method. Embryotoxicity was assessed by counting the number of live and dead fetus and growth retardation. Results: Severe alterations in all biomarkers were observed after injury with ETOH. ETOH produced significant decreases in fetal weight and significant increases in embryolethality and lipid peroxidation relative to control values. Treatment with Chrysanthemum fontanesii extract, vitamin C and vitamin E resulted in markedly decreased embryolethality and fetal growth retardation, while increased fetal weight were observed. Conclusion: The butanolic extract from leaves of Chrysanthemum fontanesii, vitamin E and C protected against ethanol induce fetal and maternal toxicity as revealed by the decrease in the extent of lipid peroxidation. So that butanolic extract from leaves of Chrysanthemum fontanesii posses in vivo antioxidant properties.
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Euhalophyte eryngium maritimum L.: the microstructure and functional characteristics
Статья научная
The microstructure of the leaf surface, lipids composition, pigments spectrum, biological and photosynthetic activity, and hormones status of euhalophyte Eryngium maritimum L., one of the most salt-tolerant plants, were studied. It was shown that the existence in saline and dry soils is provided among others adaptive mechanisms by specific microstructure of leaf, adaxial and abaxial surfaces of which have well-developed cuticle and stomata slit placed below the surface of the epidermis. The presence of a large amount of saturated fatty acids provides decrease of membrane permeability and better resistance against soil salinity. The key role in photosynthetic activity is played by chlorophyll a. At the same time a high amount of carotenoids (as compared with amount of chlorophylls) points out that these pigments have a light-collecting function and could transfer an additional energy to chlorophylls. The data from thermoluminescence analyses showed a possible inhibition of recombination reactions in PS II by the assumed saline concentration in plant tissue. Besides, the fluorescence measurements indicate reduced efficiency of photosynthetic reactions. The high level of active ABA is correlated with salt tolerance and ability to survive and grow in stress conditions. The high level of conjugated form of IAA demonstrated that activity of this hormone is limited.
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Статья научная
To evaluate the freezing resistance and genetic diversity in barley physiological traits, molecular markers and their relationship in 20 barley genotypes were assessed in field and greenhouse condition. The analysis of variance showed a significant difference among studied genotypes. The effect of acclimation temperature on prolin content, quantum efficiency of photosystem II, chlorophyll and soluble sugars content were studied as physiological traits. Freezing treatments were -4, -7, -10, -13 and -16 °C temperatures that applied in a 3 replicated randomized complete block design. Then their lethal temperature at which 50% of plant were died (LT 50) was determined. To estimate FSI (Field Survival Index) index, the 20 genotypes were cultured in a separate experiment on field with 3 replications. The results showed negative significant correlation (-0.601) between field survival index and LT 50. Cluster analysis using physiological traits, genotypes of F-A1-1, F-A1-2, F-A2-11, F-GRB-85-5, Sahra, Sahand, Dasht and Makouei were categorized in a distinct group and had a high FSI and low LT 50. Makouei cultivar having LT 50=-17.66 °C and the highest percentage of winter survival in the field, was the most resistant genotype. 10 ISSR markers from 35 primers sequences were selected and used. These 9 ISSR primers produced 50 polymorphic bands. PIC and MI average index for all primers were 0.37 and 1.72 respectively. Cluster analysis of molecular data using Jaccard similarity coefficient categorized the genotypes to four distinct groups. Associations between molecular markers and traits were assessed by multiple regression analysis. Some informative markers related to FSI and also LT 50 was determined. So it may be possible to use these markers for selection of resistant lines or genotypes in breeding programs.
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Статья научная
Background : Stress is a common entity, widely spoken about among the working population, for which a safe and effective remedy is needed. Purpose of the study : To evaluate the clinical effectiveness of Arogh plus a polyherbal formulation, towards stress relieving properties in a randomized clinical trial in volunteers. Results : The clinical benefit of stress was reinforced by way of significant reduction in serum cortisol, increase in total count and reduction of symptoms pertaining to stress in a randomized clinical trial in volunteers carried out at Rohini Holistic Health centre. Conclusion :Arogh plus is an effective formulation in relieving stress and improving the quality of life.
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Evaluating the consequences of fluoride poisoning on proximate compositions of Amaranthus dubius
Статья научная
The effect of fluoride on proximate compositions such as contents of protein, carbohydrate and fat from leaves, stems, roots and seeds were studied using various concentrations of sodium fluoride in the water used to irrigate the plant Amaranthus dubius. The results showed that Amaranthus dubius which receives only water (control) had higher amount of protein (10.04µg/g) in its leaves and low amount of protein (0.63 µg/g) in the roots of Amaranthus dubius watered with 50ppm of sodium fluoride on the 55th day of growth. The amount of protein decreases when concentration of sodium fluoride increases. The amount of carbohydrate (µg/g) in leaves of all experimentally challenged Amaranthus dubius varied from 2.0µg/g - 42.3µg/g (minimum in roots to maximum in leaves) when estimated from 15 to 55 days. Amaranthus dubius watered with 50ppm concentration of sodium fluoride showed higher amount of carbohydrate which is much higher than the carbohydrate content present in the leaves of Amaranthus dubius grown as control. The maximum presence of fat was found in the leaves of Amaranthus dubius watered with 50ppm of sodium fluoride from day 15 to 55 (1.4µg/g-0.52 µg/g).
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Evaluation and genetic polymorphism studies of jatropha (Jatropha curcus) for water stress tolerance
Статья научная
Jatropha (Jatropha curcus) is an alternative resource for biodiesel. To boost the rural economy in sustainable manner it is estimated that 30 Million hector plantation may replace current use of fossil fuel. Although Jatropha has an inbuilt ability to grow under water limited conditions, scanty information is available about natural genetic variation for water stress tolerance. Three local genotypes from Pune district were collected and initially screened by imparting artificial stress using PEG - 6000. Seedlings were subjected to increasing concentration of PEG - 6000 (30, 60, 90, 120 and 150 gm/l) to study effect on growth parameters. The root growth, number of secondary roots, true leaf expansion at morphological level and palisade mesophyll height, xylem vessel expansion at anatomical level showed drastic negative impact as compared to control. It is worth to note that local germplasm performance was categorized into susceptible group as compared to tolerant genotype [Chattisgadh Selection] indicating need for genetic improvement. These genotypes were further studied at molecular level with RAPD and ISSR markers to amplify genetic variation. Polymorphic bands from Chattisgadh selection genotype are being evaluated for their usefulness as markers for water stress tolerance.
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Статья научная
The present study was aimed to establish the induction of embryogenic callus followed by plantlet regeneration under the drought stress conditions induced by Polyethylene glycol (PEG) and Mannitol in Indian Black rice (Oryza sativa L, Co 57), a traditional Indian cereal food. Mature caryopsis was used as an explant for the induction of embryogenic callus cultured on Murashige and Skoog (1962) medium fortified with 2,4-dichlorophenoxyacetic acid (2.0mg/L) either alone or in combination with various concentrations of mannitol (25mM, 50mM, 100mM, 150mM, and 200mM) and also on medium enriched with various concentrations of PEG (0.5%, 1.0%, 2.5%, 5.0%, and 7.0%) in order to achieve the drought tolerant embryogenic callus. Moreover, plantlet regeneration could be possible from the sub-culture of embryogenic callus to MS-medium fortified with 2.0mg/L of 6-benzylaminopurine (BAP) in combination with 0.5mg/L of α- Naphthalene acetic acid (NAA) in presence of mannitol (25mM, 50mM, 100mM, and 150mM) and also on PEG (0.5%, 1.0%, 2.5%, and 5.0%) supplemented regeneration medium. Results revealed that mannitol concentration was increased up to (200 mM) in presence of 2, 4-D (2.0mg/L) was proved to be lethal for the induction of somatic embryogenesis followed by plantlet regeneration. However, mature caryopsis explants cultured on high concentration of mannitol (150mM) fortified nutrient medium produces the low frequency (33.23±1.84a %) of somatic embryogenesis and also the minimum number (4.98 ± 0.28a) of somatic embryos per callus. Similarly, the high concentration of PEG (5.0 %) produces the low frequency (21.66±1.61a %) of somatic embryogenesis and minimum number (4.04 ±0.57a) of somatic embryos per callus. Significantly, the high concentration (150mM) of mannitol with BAP (2.0mg/L) and NAA (0.5mg/L) was observed to produce the low frequency of drought tolerant plantlet regeneration (10±0.57a %) and minimum number (1.80±0.21a) of plantlets per embryogenic callus whereas during PEG treatments, the lowest frequency (8.12 ±0.58a %) of plantlet regeneration and the minimum number (1.61 ±0.19a) of plantlet regeneration could be recorded. Furthermore, drought tolerant plantlets were transferred to plastic cup soil and gradually acclimatized under the greenhouse conditions. Present study thus establishes regeneration technique under drought conditions in black rice crops that could be useful for the improvement in rice crop in general and black rice in particular.
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Статья научная
Background: Exposure to environmental contaminants, including carbon tetrachloride (CCl4), induces hepatic damage. Certain extracts from Dolichandrone atrovirens (Bignoniaceae) protect against such damage. Results: This research examines the preventive effects of hydroalcoholic extracts from the leaves of D. atrovirens (HE-DA) versus liver damage produced by CCl4 in rats. HE-DA was delivered orally to rats at three dosages (100, 200, and 300 mg/kg) in conjunction with CCl4 (1 mL/kg in olive oil) for three weeks. Lipid profile indices, peroxidation levels, and antioxidant activity were assessed in rats' liver tissue. TC, TG, PL, FFA, and LDL levels were reduced. Hepatic malondialdehyde concentrations were decreased, and antioxidant activities were modified in rats treated with HE-DA. Histopathological analysis of the liver revealed that HE-DA therapy decreased fatty degeneration, cytoplasmic vacuolisation, and necrosis. Conclusion: HE-DA had a protective effect against CCl4-induced hepatotoxicity in rats, whose antioxidant capabilities may have mediated this effect.
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