Overexpression of dehydroascorbate reductase gene IbDHAR1 improves the tolerance to abiotic stress in sweet potato

Dehydroascorbate reductase (DHAR), an indispensable enzyme in the production of ascorbic acid (AsA) in plants, is vital for plant tolerance to various stresses. However, there is limited research on the stress tolerance functions of DHAR genes in sweet potato ( Ipomoea batatas [L.] Lam). In this stu...

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Veröffentlicht in:Transgenic research 2024-10, Vol.33 (5), p.427-443
Hauptverfasser: Cheng, Qirui, Zou, Xuan, Wang, Yuan, Yang, Zhe, Qiu, Xiangpo, Wang, Sijie, Yang, Yanxin, Yang, Dongjing, Kim, Ho Soo, Jia, Xiaoyun, Li, Lingzhi, Kwak, Sang-Soo, Wang, Wenbin
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container_issue 5
container_start_page 427
container_title Transgenic research
container_volume 33
creator Cheng, Qirui
Zou, Xuan
Wang, Yuan
Yang, Zhe
Qiu, Xiangpo
Wang, Sijie
Yang, Yanxin
Yang, Dongjing
Kim, Ho Soo
Jia, Xiaoyun
Li, Lingzhi
Kwak, Sang-Soo
Wang, Wenbin
description Dehydroascorbate reductase (DHAR), an indispensable enzyme in the production of ascorbic acid (AsA) in plants, is vital for plant tolerance to various stresses. However, there is limited research on the stress tolerance functions of DHAR genes in sweet potato ( Ipomoea batatas [L.] Lam). In this study, the full-length IbDHAR1 gene was cloned from the leaves of sweet potato cultivar Xu 18. The IbDHAR1 protein is speculated to be located in both the cytoplasm and the nucleus. As revealed by qRT-PCR, the relative expression level of IbDHAR1 in the proximal storage roots was much greater than in the other tissues, and could be upregulated by high-temperature, salinity, drought, and abscisic acid (ABA) stress. The results of pot experiments indicated that under high salinity and drought stress conditions, transgenic Arabidopsis and sweet potato plants exhibited decreases in H 2 O 2 and MDA levels. Conversely, the levels of antioxidant enzymes APX, SOD, POD, and ACT, and the content of DHAR increased. Additionally, the ratio of AsA/DHA was greater in transgenic lines than in the wild type. The results showed that overexpression of IbDHAR1 intensified the ascorbic acid-glutathione cycle (AsA-GSH) and promoted the activity of the related antioxidant enzyme systems to improve plant stress tolerance and productivity.
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However, there is limited research on the stress tolerance functions of DHAR genes in sweet potato ( Ipomoea batatas [L.] Lam). In this study, the full-length IbDHAR1 gene was cloned from the leaves of sweet potato cultivar Xu 18. The IbDHAR1 protein is speculated to be located in both the cytoplasm and the nucleus. As revealed by qRT-PCR, the relative expression level of IbDHAR1 in the proximal storage roots was much greater than in the other tissues, and could be upregulated by high-temperature, salinity, drought, and abscisic acid (ABA) stress. The results of pot experiments indicated that under high salinity and drought stress conditions, transgenic Arabidopsis and sweet potato plants exhibited decreases in H 2 O 2 and MDA levels. Conversely, the levels of antioxidant enzymes APX, SOD, POD, and ACT, and the content of DHAR increased. Additionally, the ratio of AsA/DHA was greater in transgenic lines than in the wild type. 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subjects Abscisic acid
Abscisic Acid - metabolism
Animal Genetics and Genomics
antioxidant enzymes
Antioxidants
Antioxidants - metabolism
Arabidopsis
Arabidopsis - genetics
Ascorbic acid
Ascorbic Acid - metabolism
Biomedical and Life Sciences
Biomedical Engineering/Biotechnology
Cultivars
Cytoplasm
Drought
Droughts
Enzymes
Gene Expression Regulation, Plant
genes
Genetic Engineering
genetically modified organisms
Glutathione
glutathione dehydrogenase (ascorbate)
Hydrogen peroxide
Ipomoea batatas
Ipomoea batatas - enzymology
Ipomoea batatas - genetics
Life Sciences
Molecular Medicine
Oxidoreductases - genetics
Oxidoreductases - metabolism
Plant Genetics and Genomics
Plant Proteins - genetics
Plant Proteins - metabolism
plant stress
Plants, Genetically Modified - genetics
Plants, Genetically Modified - growth & development
Potatoes
Salinity
Salinity effects
stress tolerance
Stress, Physiological - genetics
sweet potatoes
Transgenic plants
Transgenics
water stress
title Overexpression of dehydroascorbate reductase gene IbDHAR1 improves the tolerance to abiotic stress in sweet potato
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