Effect of genotype and growth temperature on sorghum grain physical characteristics, polyphenol content, and antioxidant activity

Abstract

This paper reports how genotype and growth temperature affect the physical characteristics and polyphenol content in sorghum grains. Two day/night temperature regimes, 32/21 and 38/21°C, were used to grow six sorghum genotypes (CCH1, CCH2, AQL33/QL36, Ai4, PI563516, and IS 8525). The physical characteristics (hardness, weight, and diameter) of sorghum grain and their free, bound, and total polyphenol contents were determined. Grain antioxidant activity was evaluated by 2,2′-azinobis(3- ethylbenzothiazoline-6-sulfonic acid) diammonium salt and 2-2-diphenyl- 1-picrylhydrazyl assays. The results indicate that the weight and diameter of the sorghum kernels were significantly increased in all gen..