Sugar content and expression of sugar metabolism-related gene in strawberry fruits from various cultivars

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Title
Sugar content and expression of sugar metabolism-related gene in strawberry fruits from various cultivars
Author(s)
Jeongyeo Lee; Hyun Bi Kim; Young-Hee Noh; Sung Ran Min; Haeng Soon Lee; Jaeeun Jung; Kun Hyang ParkDae Soo Kim; M H Nam; T I Kim; S J Kim; Hyeran Kim
Bibliographic Citation
Journal of Plant Biotechnology, vol. 45, no. 1, pp. 90-101
Publication Year
2018
Abstract
Strawberry (Fragaria × ananassa) is a globally-cultivated and popular fruit crop, prized for its flavor and nutritional value. Sweetness, a key determinant of fruit quality, depends on the sugar composition and concentration. We selected eight strawberry cultivars based on the fruit soluble solids content to represent high and low sugar content groups. The average soluble solid content was 13.6 °Brix (Okmae, Geumsil, Aram, and Maehyang) and 2.9 °Brix (Missionary, Camino Real, Portola, and Gilgyung53), for the high and low sugar content groups, respectively. Sucrose was the main sugar in the cultivars with high sugar content, whereas fructose was the main component in the low sugar content cultivars. Fruit starch concentration ranged from 3.247±0.056 to 3.850±0.055 g/100g, with a 12% higher concentration in the high sugar content cultivars. Additionally, we identified 41 sugar metabolism-related genes in Fragaria × ananassa and analyzed the relationship between their transcripts and the sugar accumulation in fruit. FaGPT1, FaTMT1, FaHXK1, FaPHS1, FaINVA-3, and FacxINV2-1 were highly expressed in the high sugar content cultivars, while FapGlcT, FaTMT2-1, FaPHS2-1, FaSUSY1-1, and FaSUSY1-2 were highly expressed in the low sugar content cultivars. In general, a greater number of genes encoding sugar transporters or involved in sugar synthesis were highly expressed in the high sugar content cultivars. Contrarily, genes involved in sugar degradation were preferentially transcribed in the low sugar content cultivars. Although gene expression was not perfectly proportional to sugar content or concentration, our analysis of the genes involved in sugar metabolism and accumulation in strawberries provides a framework for further studies and for the subsequent engineering of sugar metabolism to enhance fruit quality.
Keyword
Soluble sugarGlucoseFructoseSucroseFragaria × ananassa
ISSN
1229-2818
Publisher
South Korea
DOI
http://dx.doi.org/10.5010/JPB.2018.45.2.090
Type
Article
Appears in Collections:
Division of Biomaterials Research > Plant Systems Engineering Research > 1. Journal Articles
Division of Bio Technology Innovation > Core Facility Management Center > 1. Journal Articles
Division of Research on National Challenges > Environmental diseases research center > 1. Journal Articles
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