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Effects of Polysaccharide Elicitors from Endophytic Fusarium oxysporum Fat9 on the Growth, Flavonoid Accumulation and Antioxidant Property of Fagopyrum tataricum Sprout Cultures

1
Department of Biological Sciences, College of Life Sciences, Sichuan University, Chengdu 610065, Sichuan, China
2
National R&D Center for Coarse Cereal Processing, Chengdu University, Chengdu 610106, Sichuan, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Thomas J. Schmidt
Molecules 2016, 21(12), 1590; https://doi.org/10.3390/molecules21121590
Received: 20 September 2016 / Revised: 12 November 2016 / Accepted: 16 November 2016 / Published: 25 November 2016
(This article belongs to the Section Natural Products Chemistry)
The purpose of this study was to evaluate the effects of four different fungal polysaccharides, named water-extracted mycelia polysaccharide (WPS), sodium hydroxide-extracted mycelia polysaccharide (SPS), hydrochloric-extracted mycelia polysaccharide (APS), and exo-polysaccharide (EPS) obtained from the endophytic Fusarium oxysporum Fat9 on the sprout growth, flavonoid accumulation, and antioxidant capacity of tartary buckwheat. Without visible changes in the appearance of the sprouts, the exogenous polysaccharide elicitors strongly stimulated sprout growth and flavonoid production, and the stimulation effect was closely related with the polysaccharide (PS) species and its treatment dosage. With application of 200 mg/L of EPS, 200 mg/L of APS, 150 mg/L of WPS, or 100 mg/L of SPS, the total rutin and quercetin yields of buckwheat sprouts were significantly increased to 41.70 mg/(100 sprouts), 41.52 mg/(100 sprouts), 35.88 mg/(100 sprouts), and 32.95 mg/(100 sprouts), respectively. This was about 1.11 to 1.40-fold compared to the control culture of 31.40 mg/(100 sprouts). Moreover, the antioxidant capacity of tartary buckwheat sprouts was also enhanced after treatment with the four PS elicitors. Furthermore, the present study revealed the polysaccharide elicitation that caused the accumulation of functional flavonoid by stimulating the phenylpropanoid pathway. The application of beneficial fungal polysaccharide elicitors may be an effective approach to improve the nutritional and functional characteristics of tartary buckwheat sprouts. View Full-Text
Keywords: polysaccharide; endophyte Fusarium oxysporum Fat9; tartary buckwheat; flavonoid; elicitation; antioxidant activity polysaccharide; endophyte Fusarium oxysporum Fat9; tartary buckwheat; flavonoid; elicitation; antioxidant activity
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Zhong, L.; Niu, B.; Tang, L.; Chen, F.; Zhao, G.; Zhao, J. Effects of Polysaccharide Elicitors from Endophytic Fusarium oxysporum Fat9 on the Growth, Flavonoid Accumulation and Antioxidant Property of Fagopyrum tataricum Sprout Cultures. Molecules 2016, 21, 1590.

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