Department Of Botany

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Subject: search.filters.subject.Ascorbic acid

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    Overexpression of banana GDP-L-galactose phosphorylase (GGP) modulates the biosynthesis of ascorbic acid in Arabidopsis thaliana
    (Elsevier B.V., 2023-03-24T00:00:00) Chaturvedi, Siddhant; Thakur, Neha; Khan, Shahirina; Sardar, Mithilesh Kumar; Jangra, Alka; Tiwari, Siddharth
    L-Ascorbic acid (AsA) is a potent antioxidant and essential micronutrient for the growth and development of plants and animals. AsA is predominantly synthesized by the Smirnoff-Wheeler (SW) pathway in plants where the GDP-L-galactose phosphorylase (GGP) gene encodes the rate-limiting step. In the present study, AsA was estimated in twelve banana cultivars, where Nendran carried the highest (17.2 mg/100 g) amount of AsA in ripe fruit pulp. Five GGP genes were identified from the banana genome database, and they were located at chromosome 6 (4 MaGGPs) and chromosome 10 (1 MaGGP). Based on in-silico analysis, three potential MaGGP genes were isolated from the cultivar Nendran and subsequently overexpressed in Arabidopsis thaliana. Significant enhancement in AsA (1.52 to 2.20 fold) level was noted in the leaves of all three MaGGPs overexpressing lines as compared to non-transformed control plants. Among all, MaGGP2 emerged as a potential candidate for AsA biofortification in plants. Further, the complementation assay of Arabidopsis thaliana vtc-5-1 and vtc-5-2 mutants with MaGGP genes overcome the AsA deficiency that showed improved plant growth as compared to non-transformed control plants. This study lends strong affirmation towards development of AsA biofortified plants, particularly the staples that sustain the personages in developing countries. � 2023 Elsevier B.V.
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    Metabolic engineering in food crops to enhance ascorbic acid production: crop biofortification perspectives for human health
    (Springer, 2022-04-19T00:00:00) Chaturvedi, Siddhant; Khan, Shahirina; Bhunia, Rupam Kumar; Kaur, Karambir; Tiwari, Siddharth
    Ascorbic acid (AsA) also known as vitamin C is considered as an essential micronutrient in the diet of humans. The human body is unable to synthesize AsA, thus solely dependent on exogenous sources to accomplish the nutritional requirement. AsA plays a crucial role in different physiological aspects of human health like bone formation, iron absorption, maintenance and development of connective tissues, conversion of cholesterol to bile acid and production of serotonin. It carries antioxidant properties and is involved in curing various clinical disorders such as scurvy, viral infection, neurodegenerative diseases, cardiovascular diseases, anemia, and diabetes. It also plays a significant role in COVID-19 prevention and recovery by improving the oxygen index and enhancing the production of natural killer cells and T-lymphocytes. In plants, AsA plays important role in floral induction, seed germination, senescence, ROS regulation and photosynthesis. AsA is an essential counterpart of the antioxidant system and helps to defend the plants against abiotic and biotic stresses. Surprisingly, the deficiencies of AsA are spreading in both developed and developing countries. The amount of AsA in the major food crops such as wheat, rice, maize, and other raw natural plant foods is inadequate to fulfill its dietary requirements. Hence, the biofortification of AsA in staple crops would be feasible and cost-effective means of delivering AsA to populations that may have limited access to diverse diets and other interventions. In this review, we endeavor to provide information on the role of AsA in plants and human health, and also perused various biotechnological and agronomical approaches for elevating AsA content in food crops. � 2022, Prof. H.S. Srivastava Foundation for Science and Society.
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    Overexpression of banana GDP-L-galactose phosphorylase (GGP) modulates the biosynthesis of ascorbic acid in Arabidopsis thaliana
    (Elsevier B.V., 2023-03-24T00:00:00) Chaturvedi, Siddhant; Thakur, Neha; Khan, Shahirina; Sardar, Mithilesh Kumar; Jangra, Alka; Tiwari, Siddharth
    L-Ascorbic acid (AsA) is a potent antioxidant and essential micronutrient for the growth and development of plants and animals. AsA is predominantly synthesized by the Smirnoff-Wheeler (SW) pathway in plants where the GDP-L-galactose phosphorylase (GGP) gene encodes the rate-limiting step. In the present study, AsA was estimated in twelve banana cultivars, where Nendran carried the highest (17.2 mg/100 g) amount of AsA in ripe fruit pulp. Five GGP genes were identified from the banana genome database, and they were located at chromosome 6 (4 MaGGPs) and chromosome 10 (1 MaGGP). Based on in-silico analysis, three potential MaGGP genes were isolated from the cultivar Nendran and subsequently overexpressed in Arabidopsis thaliana. Significant enhancement in AsA (1.52 to 2.20 fold) level was noted in the leaves of all three MaGGPs overexpressing lines as compared to non-transformed control plants. Among all, MaGGP2 emerged as a potential candidate for AsA biofortification in plants. Further, the complementation assay of Arabidopsis thaliana vtc-5-1 and vtc-5-2 mutants with MaGGP genes overcome the AsA deficiency that showed improved plant growth as compared to non-transformed control plants. This study lends strong affirmation towards development of AsA biofortified plants, particularly the staples that sustain the personages in developing countries. � 2023 Elsevier B.V.
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    Metabolic engineering in food crops to enhance ascorbic acid production: crop biofortification perspectives for human health
    (Springer, 2022-04-19T00:00:00) Chaturvedi, Siddhant; Khan, Shahirina; Bhunia, Rupam Kumar; Kaur, Karambir; Tiwari, Siddharth
    Ascorbic acid (AsA) also known as vitamin C is considered as an essential micronutrient in the diet of humans. The human body is unable to synthesize AsA, thus solely dependent on exogenous sources to accomplish the nutritional requirement. AsA plays a crucial role in different physiological aspects of human health like bone formation, iron absorption, maintenance and development of connective tissues, conversion of cholesterol to bile acid and production of serotonin. It carries antioxidant properties and is involved in curing various clinical disorders such as scurvy, viral infection, neurodegenerative diseases, cardiovascular diseases, anemia, and diabetes. It also plays a significant role in COVID-19 prevention and recovery by improving the oxygen index and enhancing the production of natural killer cells and T-lymphocytes. In plants, AsA plays important role in floral induction, seed germination, senescence, ROS regulation and photosynthesis. AsA is an essential counterpart of the antioxidant system and helps to defend the plants against abiotic and biotic stresses. Surprisingly, the deficiencies of AsA are spreading in both developed and developing countries. The amount of AsA in the major food crops such as wheat, rice, maize, and other raw natural plant foods is inadequate to fulfill its dietary requirements. Hence, the biofortification of AsA in staple crops would be feasible and cost-effective means of delivering AsA to populations that may have limited access to diverse diets and other interventions. In this review, we endeavor to provide information on the role of AsA in plants and human health, and also perused various biotechnological and agronomical approaches for elevating AsA content in food crops. � 2022, Prof. H.S. Srivastava Foundation for Science and Society.
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    Amelioration of Salinity stress in Chickpea (Cicer arietinum L.) variety PBG5 through foliar spray of Ascorbic acid
    (Central University of Punjab, 2018) Kumar, Rajneesh; Choudhary, Krishna
    Chickpea (C. arietinum L.) is the second most important legume crop sown as a winter crop in northern parts of India, and its productivity is constraint by several abiotic stress, and sat stress is one of the important factor for significant yield loss. Spraying the plants with ascorbic acid might trigger the signaling pathways that will prepare the plants to combat lethal salt stress. In this study, chickpea variety PBG5 was sprayed with ascorbic acid along with 50 mM of NaCl stress and further analyzed for various parameters. To see the effects of ascorbic acid spray various cell responses were monitored by measuring membrane damage (ELI & MDA content), water status (RLWC), Chlorophyll content and Antioxidant enzyme activity (SOD and CAT) along with growth and total biomass. Present study clearly reflected that foliar spray of ascorbic acid enhances the tolerance capacity of the plants and prevents noticeable damage in them. To conclude whole study, treatment with ascorbic acid has ability to improve the tolerance against salt stress in chickpea.