Cloning and characterization of an Orange gene that increases carotenoid accumulation and salt stress tolerance in transgenic sweetpotato cultures

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Title
Cloning and characterization of an Orange gene that increases carotenoid accumulation and salt stress tolerance in transgenic sweetpotato cultures
Author(s)
Sun Ha Kim; Y O Ahn; M J Ahn; Jae Cheol Jeong; Haeng Soon Lee; Sang Soo Kwak
Bibliographic Citation
Plant Physiology and Biochemistry, vol. 70, no. C, pp. 445-454
Publication Year
2013
Abstract
The Orange (Or) gene is responsible for the accumulation of carotenoids in plants. We isolated the Or gene (IbOr) from storage roots of orange-fleshed sweetpotato (Ipomoea batatas L. Lam. cv. Sinhwangmi), and analyzed its function in transgenic sweetpotato calli. The IbOr gene has an open reading frame in the 942bp cDNA, which encodes a 313-amino acid protein containing a cysteine-rich zinc finger domain. IbOr was strongly expressed in storage roots of orange-fleshed sweetpotato cultivars; it also was expressed inleaves, stems, and roots of cultivars with alternatively colored storage roots. IbOr transcription increased in response to abiotic stress, with gene expression reaching maximum at 2h after treatment. Two different overexpression vectors of IbOr (IbOr-. Wt and IbOr-Ins, which contained seven extra amino acids) were transformed into calli of white-fleshed sweetpotato [cv. Yulmi (Ym)] using Agrobacterium. The transgenic calli were easily selected because they developed a fine orange color. The expression levels of the IbOr transgene and genes involved in carotenoid biosynthesis in IbOr-. Wt and IbOr-. Ins transgenic calli were similar, and both transformants displayed higher expression levels than those in Ym calli. The contents of β-carotene, lutein, and total carotenoids in IbOr-Ins transgenic lines were approximately 10, 6, and 14 times higher than those in Ym calli, respectively. The transgenic IbOr calli exhibited increased antioxidant activity and increased tolerance to salt stress. Our work shows that the IbOr gene may be useful for the biotechnological development of transgenic sweetpotato plants that accumulate increased carotenoid contents on marginal agricultural lands.
Keyword
CarotenoidMetabolic engineeringOrange gene (IbOr)Salt stressSweetpotato
ISSN
0981-9428
Publisher
Elsevier
DOI
http://dx.doi.org/10.1016/j.plaphy.2013.06.011
Type
Article
Appears in Collections:
Jeonbuk Branch Institute > Biological Resource Center > 1. Journal Articles
Division of Biomaterials Research > Plant Systems Engineering Research > 1. Journal Articles
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