Multi-year evaluation of stilbene levels among selected muscadine grape cultivars

Authors: KAMBIRANDA, DEVAIAH - Southern University; BASHA, SHEIKH - Florida A & M University; Stringer, Stephen; OBUYA, JAMES - Florida A & M University; SNOWDEN, JANANA - Southern University

Submitted to: Molecules
Publication Type: Peer Reviewed Journal
Publication Acceptance Date: 2/27/2019
Publication Date: 3/11/2019
Citation: Kambiranda, D., Basha, S.M., Stringer, S.J., Obuya, J.O., Snowden, J. 2019. Multi-year evaluation of stilbene levels among selected muscadine grape cultivars. Molecules. 24(5):981. https://doi.org/10.3390/molecules24050981.
DOI: https://doi.org/10.3390/molecules24050981

Interpretive Summary: Muscadine grape cultivars vary widely in nutraceutivcal value due to differences in their stilbenes content. Variation in environmental conditions among different years may also affect levels of stilebenes. This study demonstrated that cultivars such as 'Fry Seedless' consistently produce high stilbene levels year after year. This information can be usefrul to growers considering growing value-added muscadine grapes possessing high concentations of nutraceutical compounds.

Technical Abstract: Stilbenes, piceid resveratrol, viniferous and pterostilbene can differ significantly among grape cultivars and years due to variation in environmental conditions amd subsequent stresses encountered during a year. This study evaluated diverse muscadine grape cultivars for their ability to consistently produce major stilbenes piceid, reseveratrol, viniferins and pterostilbene irrespective of environmental changes that impact stilbene production. Berries from fourty-two muscadine grape cultivars were collected during three years (2013, 2014, and 2015) to measure stilbenes. Results showd significant differences in the four stilbenes composition among the muscadine cultivars. Highest stilbene levels was observed in 'Fry Seedless' (270.20) ug/g fesh weight) in each of the three consecutive years tested followed by 'Pride' (46.18 ug/g fresh weight) while 'Doreen' produced the lowest level of stilbebnes (1.73 ug/g fresh weight). Results demonstrated that certain muscadine grapes consistently produce higher levels of the four major stilbenes year after year than others. Based on total stilbenes content the 42 muscadine cultivars studied were grouped into High, Medium, and Low stilebene containing varieties. This information will help establish new vineyards with cultivars that are least prone to environmental inflluences for consistently producing stilbenes-richi muscadine grape berries to enhance their market value and proote consume health.