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Plants Response to Abiotic Stresses: Strategies for Adaptations and Survival

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A special issue of Horticulturae (ISSN 2311-7524). This special issue belongs to the section "Biotic and Abiotic Stress".

Deadline for manuscript submissions: closed (20 August 2024) | Viewed by 26729

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Dr. Amith R. Devireddy

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Plant Systems Biology, Biosciences Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA
Interests: plant physiology; abiotic stress; stomata; secondary metabolites; reactive oxygen species; signal transduction; photosynthesis
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Special Issue Information

Dear Colleagues,

Plants, being sessile organisms, need to adapt to and survive harsh environmental conditions. These include extreme climates, drought, high temperatures, high light, heavy metals and nutrient deficiency. These conditions, individually or in combination, cause a significant loss in crop yield and quality.

Studies using model plants suggest that plants could coordinate different signal transduction pathways to sense and respond to stress. As part of these stress response mechanisms, some other changes include (i) changes at the cellular, molecular, or biochemical level, (ii) changes in secondary metabolite production such as ROS, NO, hormones, etc., and/or (iii) other physiological modifications such as leaf anatomy, stomatal responses, etc. These modifications help alter the rate and efficiency of plant metabolism and photosynthesis, thus helping plants to adapt to and survive stressful environments. However, how these events or mechanisms are coordinated in the crop or horticultural plants is still not completely known. Hence, a deeper understanding of these action mechanisms is required. The probable outcomes from these studies can be used in the plant biotechnology industry to not only develop stress-tolerant crops, but also help overcome plant-species-specific or region-specific environmental challenges.

In this context, this Special Issue aims to is highlight potential research outcomes that may lead to a deeper understanding of the plant's responses, adaptation, and survival to abiotic stresses. This issue will focus on the cellular, molecular, physiological, or any other mechanisms used by plants to recognize and respond to diverse abiotic stresses and their combinations. Papers addressing specific abiotic stress are also welcomed. This Special Issue will accept original research papers, methods, reviews, and perspectives.

Dr. Amith R. Devireddy
Guest Editor

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Keywords

abiotic stress
physiology
adaptation and survival
signal transduction
secondary metabolites
phytohormones
gene expression
photosynthesis
tolerance
resistance

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Published Papers (10 papers)

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Research

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17 pages, 2141 KiB

Open AccessArticle

Potassium Nutrition Induced Salinity Mitigation in Mungbean [Vigna radiata (L.) Wilczek] by Altering Biomass and Physio-Biochemical Processes

by Muhammad Yousaf Shani, M. Yasin Ashraf, Ammara Khalid Butt, Shahid Abbas, Muhammad Nasif, Zafran Khan, Rosario Paolo Mauro, Claudio Cannata, Nimra Gul, Maria Ghaffar and Faiqa Amin

Horticulturae 2024, 10(6), 549; https://doi.org/10.3390/horticulturae10060549 - 24 May 2024

Cited by 2 | Viewed by 1060

Abstract

The present investigation was conducted to explore the role of potassium nutrition in improving biomass and physio-chemical alterations to reduce the adverse effects of salinity in mungbean. A sand-culture experiment was carried out under different salinity levels (0, 50, and 100 mM NaCl) with two levels of potassium (0 and 50 mM K₂SO₄) and two mungbean cultivars (NM-92 and Ramzan), and the alterations in mungbean biomass and metabolic activities were investigated. The results suggested that salinity significantly reduced the biomass, nitrate reductase activity (NRA), nitrite reductase activity (NiRA), total soluble proteins, chlorophyll a, chlorophyll b, total chlorophyll, nitrogen, potassium, calcium, magnesium, and phosphorous contents in both mungbean cultivars in comparison to the control. However, K₂SO₄ at 50 mM significantly improved all the parameters in both mungbean cultivars except for the sodium content. A significant increase in the total free amino acids, carotenoids, and sodium content in both mungbean cultivars was observed due to salt stress. Moreover, principal component analysis and heatmaps were developed individually for both mungbean cultivars to assess the variability and correlation among the studied attributes under all applied treatments. Under saline conditions, the mungbean ‘Ramzan’ showed more marked reductions in almost all the growth parameters as compared to ‘NM-92’. The results suggest that the application of K₂SO₄ ameliorates the adverse effects of salinity by regulating osmolyte production, NRA, and NiRA, thus promoting plant growth and productivity. Full article

(This article belongs to the Special Issue Plants Response to Abiotic Stresses: Strategies for Adaptations and Survival)

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12 pages, 1022 KiB

Open AccessArticle

Study on Morphological Traits of Natural Populations of Vaccinium uliginosum at Different Altitudinal Gradients on Changbai Mountain

by Chunnan Fan, Zhongling Guo and Jinping Zheng

Horticulturae 2024, 10(3), 224; https://doi.org/10.3390/horticulturae10030224 - 26 Feb 2024

Viewed by 1160

Abstract

Vaccinium uliginosum (VU) is one of the most precious wild berry plants distributed in the Changbai Mountain region in northeast China. Eight key morphological traits of VU were analyzed to examine the variation among and within five natural populations at different altitudes, as well as their response to environmental factors. The study results showed an increasing trend of variation among populations with ascending altitudes, but the range variation within populations exhibited a decreasing trend. The diversity level among populations was found to be higher than that within populations, and the five populations of VU were classified into four groups. Except for leaf width and twig length, all other morphological traits demonstrated significant or extremely significant correlations. Generally, with increasing altitude, leaf length decreased, while plant height, clear bole height, and basal diameter decreased significantly, and similar trends were observed with moisture factors, while a significant positive correlation was found with temperature factors. Among them, the morphological traits of clear bole height and basal diameter exhibited the strongest correlation with environmental factor variations. Overall, these findings indicate extensive variation in the morphological traits of VU within and among populations at different altitudes, with clear responses to changes in environmental factors. Full article

(This article belongs to the Special Issue Plants Response to Abiotic Stresses: Strategies for Adaptations and Survival)

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18 pages, 11766 KiB

Open AccessEditor’s ChoiceArticle

Characterization of Changes in Active Ingredients and Mining of Key Metabolites in Bletilla striata under Shading and Drought Stresses

by Ruoyong Yin, Leiru Chen, Pengfei Deng, Xiaoqing Cao and Xiaoniu Xu

Horticulturae 2024, 10(2), 163; https://doi.org/10.3390/horticulturae10020163 - 10 Feb 2024

Cited by 2 | Viewed by 1337

Abstract

Shading and drought are considered crucial abiotic stress factors that limit the normal growth of plants. Under natural conditions, the quality of Bletilla striata pseudobulbs (BP), a Chinese traditional medicinal crop, is often affected by the dual stresses of shading and drought. However, the relationship and mechanism of the interaction between the two stress factors in B. striata remain unclear. In this study, we examined the changes in photosynthetic properties and active ingredients of B. striata under shading (L), drought (W), and shading-drought dual stresses (LW). We aimed to explore the metabolite mechanism that led to these changes using GC-MS-based non-targeted metabolomics techniques. The results indicated a significant reduction in the polysaccharide content of BP under W and LW treatments compared to the control (CK). The total phenol content was significantly reduced under L treatment, while the total flavonoid content did not change significantly under the three stresses. The significant increase in militarine content under all three stresses implies that B. striata may modulate its biosynthesis in response to different environmental stresses. Transpiration rate and stomatal conductance were reduced, amino acid expression was up-regulated, and carbohydrate expression was down-regulated in B. striata under L treatment. The net photosynthesis rate, stomatal conductance, and transpiration rate exhibited significant reductions, and the tuber metabolic disorder marker Homocysteine increased and organic acid content as well under W treatment. The net photosynthetic rate, transpiration rate, stomatal conductance, and water use efficiency of B. striata were further reduced under LW compared with single stress, which is in agreement with the “trade-off theory”. Pseudobulb metabolite changes, in combination with the results of the two single stresses, showed an up-regulation of amino acids and disaccharide compounds and a down-regulation of monosaccharide compounds. A support vector machine model (SVM) was used to screen 10 marker metabolites and accurately predict the changes in active ingredient content through an artificial neural network model (ANN). The results suggest that an appropriate stress environment can enhance the content of the target active ingredients based on cultivation goals. Full article

(This article belongs to the Special Issue Plants Response to Abiotic Stresses: Strategies for Adaptations and Survival)

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15 pages, 2776 KiB

Open AccessArticle

Sodium Silicate Improves Cucumber Seedling Growth and Substrate Nutrients and Reduces Heavy Metal Accumulation in Plants

by Wei Tian, Zhaoxuan Li, Kaixuan Gong, Xiaodong Wang, Sadiq Shah, Xiaozhuo Wang and Xueyan Zhang

Horticulturae 2023, 9(9), 988; https://doi.org/10.3390/horticulturae9090988 - 1 Sep 2023

Viewed by 1522

Abstract

The gasification filter cake (GFC) has great application potential for improving the characteristics of seedling substrates due to its nutrient richness and excellent water retention capacity. However, GFCs leach heavy metals easily and thus pose certain ecological risks. Sodium silicate can enhance plant resistance to heavy metal toxicity by fixing heavy metals. This study investigated the impact of sodium silicate on cucumber plant growth, the chemical characterization of the substrate, and the distribution and transfer of heavy metals. Sodium silicate was added to the seedling substrate mix at mass rates of 0 g/kg⁻¹ (GFC0), 2 g/kg⁻¹ (GFC2), 4 g/kg⁻¹ (GFC4), and 8 g/kg⁻¹ (GFC8). The seedling substrate was composed of a commercial matrix, caragana compost, and GFC (m:m 7:7:2). The GFC increased the content of total phosphorus (P), available phosphorus (P), and available potassium (K) in the substrate by 31.58%, 16.58%, and 80.10%, respectively. Conversely, the GFC decreased the plant height by 12.3%. Adding sodium silicate to the GFC increased the chlorophyll content of the plants, fixed heavy metals in the substrate, and promoted nutrient absorption and utilization by the plants. Compared with GFC0 without sodium silicate, adding sodium silicate at a mass rate of 2 g/kg⁻¹ (GFC2) reduced the chromium, lead, and cadmium contents by 51.13%, 26.37%, and 90.04%, respectively, which effectively alleviated heavy metal stress and was more conducive to plant growth. Full article

(This article belongs to the Special Issue Plants Response to Abiotic Stresses: Strategies for Adaptations and Survival)

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14 pages, 1460 KiB

Open AccessArticle

Mitigation of Salinity Stress on Pomegranate (Punica granatum L. cv. Wonderful) Plant Using Salicylic Acid Foliar Spray

by Hoda A. Khalil, Diaa O. El-Ansary and Zienab F. R. Ahmed

Horticulturae 2022, 8(5), 375; https://doi.org/10.3390/horticulturae8050375 - 25 Apr 2022

Cited by 27 | Viewed by 3804

Abstract

Salt stress significantly impacts plant morphological structure and physiological processes, resulting in decreased plant growth. Salicylic acid (SA) is a key signal molecule that protects plants from the negative impacts of salinity. Under natural conditions, the pomegranate plant generally exhibits salt-tolerant characteristics. The objective of this study was to elucidate the salt-tolerance level of pomegranate (Punica granatum L. cv. Wonderful) and the effect of the regulating strategy of SA foliar spray on growth, morphological structure, and physiological processes. SA levels were 0, 0.25, 0.50, and 1 mM in the presence of salinity levels of 10, 35, and 70 mM NaCl, respectively. Vegetative growth indices, including stem cross-sectional area, leaf area, and total dry weight, were lowered by salinity treatments. However, SA applications greatly improved morphological characteristics and plant growth under salt stress. The effects of salinity were effectively reversed by SA treatment at 1 mM compared to control and other treatments. Interestingly, SA applications enhanced the chlorophyll, total phenolic, carbohydrate, and proline contents of leaves while decreasing electrolyte leakage (EL), Na, and Cl levels. Moreover, the foliar SA treatments enhanced the nutrient content in the leaves and increased the activities of peroxidase (POD) and catalase (CAT), with a decrease in malondialdehyde (MDA) content. This study suggests that the alleviation of the salinity stress by SA may be due to the activation of the antioxidant enzymatic mechanism and decrease in the lipid peroxidation of the pomegranate plant. Full article

(This article belongs to the Special Issue Plants Response to Abiotic Stresses: Strategies for Adaptations and Survival)

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19 pages, 336 KiB

Open AccessArticle

Integrative Seed and Leaf Treatment with Ascorbic Acid Extends the Planting Period by Improving Tolerance to Late Sowing Influences in Parsley

by Sudad K. Al-Taweel, Hussein E. E. Belal, Dalia M. El Sowfy, El-Sayed M. Desoky, Mostafa M. Rady, Khaled E. Mazrou, Ahmed R. M. Maray, Mohamed E. El-Sharnouby, Khalid H. Alamer, Esmat F. Ali and Alaa I. B. Abou-Sreea

Horticulturae 2022, 8(4), 334; https://doi.org/10.3390/horticulturae8040334 - 15 Apr 2022

Cited by 3 | Viewed by 2385

Abstract

Abnormal production of reactive oxygen species (ROS) is an undesirable event which occurs in plants due to stress. To meet this event, plants synthesize ROS-neutralizing compounds, including the non-enzymatic oxidant scavenger known as vitamin C: ascorbic acid (AsA). In addition to scavenging ROS, AsA modulates many vital functions in stressed or non-stressed plants. Thus, two-season (2018/2019 and 2019/2020) trials were conducted to study the effect of integrative treatment (seed soaking + foliar spray) using 1.0 or 2.0 mM AsA vs. distilled water (control) on the growth, seed yield, and oil yield of parsley plants under three sowing dates (SDs; November, December, and January, which represent adverse conditions of late sowing) vs. October as the optimal SD (control). The ion balance, osmotic-modifying compounds, and different antioxidants were also studied. The experimental layout was a split plot in a completely randomized block design. Late sowing (December and January) noticeably reduced growth traits, seed and oil yield components, and chlorophyll and nutrient contents. However, soluble sugar, proline, and AsA contents were significantly increased along with the activities of catalase (CAT) and superoxide dismutase (SOD). Under late sowing conditions, the use of AsA significantly increased growth, different yields, essential oil fractions, CAT and SOD activities, and contents of chlorophylls, nutrients, soluble sugars, free proline, and AsA. The interaction treatments of SDs and AsA concentrations indicated that AsA at a concentration of 2 mM was more efficient in conferring greater tolerance to adverse conditions of late sowing in parsley plants. Therefore, this study recommends 2.0 mM AsA for integrative (seed soaking + foliar spraying) treatment to prolong the sowing period of parsley seeds (from October up to December) and avoid damage caused by adverse conditions of late sowing. Full article

(This article belongs to the Special Issue Plants Response to Abiotic Stresses: Strategies for Adaptations and Survival)

14 pages, 1346 KiB

Open AccessArticle

Physiological Response to Short-Term Heat Stress in the Leaves of Traditional and Modern Plum (Prunus domestica L.) Cultivars

by Marija Viljevac Vuletić, Ines Mihaljević, Vesna Tomaš, Daniela Horvat, Zvonimir Zdunić and Dominik Vuković

Horticulturae 2022, 8(1), 72; https://doi.org/10.3390/horticulturae8010072 - 13 Jan 2022

Cited by 12 | Viewed by 3119

Abstract

The aim of this study was to evaluate physiological responses to short-term heat stress in the leaves of traditional (Bistrica) and modern (Toptaste) plum cultivars. In this study, detached plum leaves were incubated at 25 °C (control) and 40 °C (stress). After 1 h of exposure to heat (40 °C), chlorophyll a fluorescence transients were measured, and several biochemical parameters were analyzed. Elevated temperature caused heat stress in both plum cultivars, seen as a decrease in water content (WT), but in the leaves of the cultivar Bistrica, an accumulation of proline and phenols, as well as an accumulation of photosynthetic pigments, suggest the activation of a significant response to unfavorable conditions. Conversely, in the leaves of Toptaste, a significant accumulation of malondialdehyde (MDA) and an activation of guaiacol peroxidase (GPOD), all together with a decreased soluble proteins content, indicate an inadequate response to maintaining homeostasis in the leaf metabolism. The impact of an elevated temperature on photosynthesis was significant in both plum cultivars as reflected in the decrease in performance indexes (PI_ABS and PI_total) and the maximum quantum yield of PSII (F_v/F_m), with significantly pronounced changes found in Toptaste. Unlike the traditional plum cultivar, Bistrica, in the modern cultivar, Toptaste, short-term heat stress increased the minimal fluorescence (F₀) and absorption (ABS/RC), as well as Chl b in total chlorophylls. Additionally, the inactivation of RCs (RC/ABS) suggests that excitation energy was not trapped efficiently in the electron chain transport, which resulted in stronger dissipation (DI₀/RC) and the formation of ROSs. Considering all presented results, it can be presumed that the traditional cultivar Bistrica has better tolerance to heat stress than the modern cultivar Toptaste. The cultivar, Bistrica, can be used as a basis in further plum breeding programs, as a source of tolerance for high temperature stress. Full article

(This article belongs to the Special Issue Plants Response to Abiotic Stresses: Strategies for Adaptations and Survival)

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13 pages, 2764 KiB

Open AccessArticle

Mechanisms of Nitric Oxide in the Regulation of Chilling Stress Tolerance in Camellia sinensis

by Yingzi Wang, Qin Yu, Yinhua Li, Juan Li, Jinhua Chen, Zhonghua Liu, Jian’an Huang, Mohammad S. Al-Harbi, Esmat F. Ali and Mamdouh A. Eissa

Horticulturae 2021, 7(10), 410; https://doi.org/10.3390/horticulturae7100410 - 16 Oct 2021

Cited by 14 | Viewed by 2687

Abstract

Tea [Camellia sinensis (L.)] plants are important economic crop in China. Chilling stress and freezing damages have seriously affected the quality of tea products that have been already regarded as the main restricting factors to industry’s development. Nitric oxide (NO) plays a crucial role in resistance of abiotic stresses. An experiment was conducted in an artificial climate chamber to study the effect of NO on tea plants grown under chilling stress (−2 °C) for 0, 6, 24, 48, and 72 h. Foliar application of sodium nitroprusside (SNP) at a rate of 500 μmol·L⁻¹ was used as NO donor. The experiment contained two factors: the first was the foliar application with SNP or distilled water, and the scond one was the chilling (−2 °C) exposure time (0, 6, 24, 48, and 72 h). The effects of NO on membrane lipid peroxidation, osmotic adjustment substances, and antioxidant activity under cold stress were studied. In addition, the gene expression of CsICE1 and CsCBF1 in respond to NO addition were also investigated using real-time polymerase chain reaction (RT-PCR). The results show that foliar addition of NO (500 μmol·L⁻¹ of SNP) reduce the relative conductivity of tea leaves, inhibits the elevated malondialdehyde content, promotes the accumulation of proline, soluble protein and sugar, and increases the superoxide dismutase, catalase activities, thereby alleviates the damage of cold stress on tea leaves. The CsICE1 expression in 500 μM SNP treatment was peaked at 24 h of low temperature stress, while it did not express at normal temperature. Therefore, the current study is considered a good scientific material in understanding how tea plants sense and defense the chilling stress and that plays an important role to improve the level of production and economic benefits. It is also provided significant theory bas to control chilling stress in tea plants. Full article

(This article belongs to the Special Issue Plants Response to Abiotic Stresses: Strategies for Adaptations and Survival)

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17 pages, 3983 KiB

Open AccessArticle

Heat Stress at Early Reproductive Stage Differentially Alters Several Physiological and Biochemical Traits of Three Tomato Cultivars

by Md. Sabibul Haque, Mst. Tanziatul Husna, Md. Nesar Uddin, Md. Alamgir Hossain, Abul Khayer Mohammad Golam Sarwar, Omar M. Ali, Arafat Abdel Hamed Abdel Latef and Akbar Hossain

Horticulturae 2021, 7(10), 330; https://doi.org/10.3390/horticulturae7100330 - 22 Sep 2021

Cited by 13 | Viewed by 4233

Abstract

Global warming is predicted to be increased in the upcoming years, resulting in frequent heatwaves or hot days worldwide, which can seriously affect crop growth and productivity. The responses of heat stress to several photophysiological and biochemical traits in three tomato cultivars were investigated in a pot experiment, and the heat tolerance capability of these cultivars was evaluated based on the investigated traits. The experiment was followed by a factorial completely randomized design, and the factors were (i) tomato cultivars (BARI Hybrid Tomato-5, BARI Tomato-14, and BARI Tomato-15) and (ii) heat stress (control and heat). The plants of three tomato cultivars were exposed to short-term heat stress (four days at 38/25 °C day/night temperature) at the flowering stage. The measured traits such as dry mass, leaf greenness (SPAD), maximum photochemical efficiency of photosystem II (F_v/F_m), photosynthetic rate (A), stomatal conductance (g_s), transpiration rate (E), leaf chlorophyll, and carotenoid content were significantly declined, while the catalase and ascorbate peroxidase activities were increased by heat stress in all three tomato cultivars except BARI Tomato-15, which showed unaltered g_s, E, and carotenoids. The percent reduction (over control) in SPAD, F_v/F_m, A, total chlorophyll, and total carotenoids was significantly lower (11, 06, 25, 34, and 19%, respectively), whereas the percent increase in catalase and ascorbate peroxidase activities was substantially higher (70 and 72%, respectively) in BARI Tomato-15 than in other cultivars. Based on the measured physiological and biochemical traits, the cultivar BARI Tomato-15 showed better heat tolerance than the other cultivars. Full article

(This article belongs to the Special Issue Plants Response to Abiotic Stresses: Strategies for Adaptations and Survival)

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Review

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13 pages, 3292 KiB

Open AccessReview

Individual and Interactive Effects of Elevated Ozone and Temperature on Plant Responses

by Jong Kyu Lee, Myeong Ja Kwak, Su Gyeong Jeong and Su Young Woo

Horticulturae 2022, 8(3), 211; https://doi.org/10.3390/horticulturae8030211 - 28 Feb 2022

Cited by 9 | Viewed by 3527

Abstract

From the preindustrial era to the present day, the tropospheric ozone (O₃) concentration has increased dramatically in much of the industrialized world due to anthropogenic activities. O₃ is the most harmful air pollutant to plants. Global surface temperatures are expected to increase with rising O₃ concentration. Plants are directly affected by temperature and O₃. Elevated O₃ can impair physiological processes, as well as cause the accumulation of reactive oxygen species (ROS), leading to decreased plant growth. Temperature is another important factor influencing plant development. Here, we summarize how O₃ and temperature elevation can affect plant physiological and biochemical characteristics, and discuss results from studies investigating plant responses to these factors. In this review, we focused on the interactions between elevated O₃ and temperature on plant responses, because neither factor acts independently. Temperature has great potential to significantly influence stomatal movement and O₃ uptake. For this reason, the combined influence of both factors can yield significantly different results than those of a single factor. Plant responses to the combined effects of elevated temperature and O₃ are still controversial. We attribute the substantial uncertainty of these combined effects primarily to differences in methodological approaches. Full article

(This article belongs to the Special Issue Plants Response to Abiotic Stresses: Strategies for Adaptations and Survival)

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