Phenolic profile and content of sorghum grains under different irrigation managements

Gangcheng Wu; Sarita J Bennett; Janet F Bornman; Michael W Clarke; Zhongxiang Fang; Stuart K Johnson

doi:10.1016/j.foodres.2017.04.030

Phenolic profile and content of sorghum grains under different irrigation managements

Food Res Int. 2017 Jul:97:347-355. doi: 10.1016/j.foodres.2017.04.030. Epub 2017 May 6.

Authors

Gangcheng Wu¹, Sarita J Bennett², Janet F Bornman³, Michael W Clarke⁴, Zhongxiang Fang⁵, Stuart K Johnson⁶

Affiliations

¹ School of Public Health, Curtin Health Innovation Research Institute, Curtin University, Perth, WA 6845, Australia.
² Department of Environment and Agriculture, School of Science, Curtin University, Perth, WA 6845, Australia.
³ International Institute of Agri-Food Security (IIAFS), Curtin University, PO Box U1987, Perth, WA 6845, Australia.
⁴ Centre for Microscopy, Characterisation and Analysis - M310, Perth, WA 6009, Australia.
⁵ Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Parkville, Victoria 3010, Australia. Electronic address: zhongxiang.fang@unimelb.edu.au.
⁶ School of Public Health, Curtin Health Innovation Research Institute, Curtin University, Perth, WA 6845, Australia. Electronic address: S.Johnson@curtin.edu.au.

PMID: 28578059
DOI: 10.1016/j.foodres.2017.04.030

Abstract

Sorghum grain is widely consumed in Sub-Saharan Africa and Asia, as a staple food due to its adaptation to harsh environments. The impact of irrigation regime: full irrigation (100%); deficit irrigation (50%); and severe deficit irrigation (25%) on phenolic profile and content of six sorghum grain genotypes was investigated by high performance liquid chromatography coupled with diode array detection and electrospray ionization mass spectrometry (HPLC-DAD-ESI-MS). A total of 25 individual polyphenols were unequivocally or tentatively identified. Compared to the colored-grain genotypes, the white grained sorghum var. Liberty had a simpler polyphenol profile. The concentrations of the sorghum-specific 3-deoxyanthocyanidins luteolinidin and apigeninidin, were higher under deficit irrigation compared to the other two regimes in all genotypes. These findings will be valuable for the selection of sorghum genotypes for grain production as human food under water deficit conditions, since polyphenol levels can affect the grain's nutritional value and health properties.

Keywords: Genotype; HPLC-MS; Irrigation; Polyphenols; Sorghum.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Agricultural Irrigation / methods*
Climate Change
Droughts
Edible Grain / chemistry*
Phenols / analysis*
Plant Extracts / chemistry
Rain
Sorghum / chemistry*
Sorghum / genetics
Sorghum / physiology

Substances

Phenols
Plant Extracts