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Agronomy 2018, 8(11), 271; https://doi.org/10.3390/agronomy8110271

Genotypic Variation in Anthocyanins, Phenolic Compounds, and Antioxidant Activity in Cob and Husk of Purple Field Corn

1
Department of Agronomy, Faculty of Agriculture, Khon Kaen University, Khon Kaen 40002, Thailand
2
Department of Biochemistry, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand
3
Department of Agricultural Technology, Faculty of Science and Technology, Thammasat University, Phathum Thani 12120, Thailand
4
Department of Horticulture, Faculty of Agriculture, Khon Kaen University, Khon Kaen 40002, Thailand
5
Plant Breeding Research Center for Sustainable Agriculture, Khon Kaen 40002, Thailand
6
USDA-ARS Corn Insects and Crop Genetics Research Unit, USDA-ARS, Ames, IA 50011, USA
*
Author to whom correspondence should be addressed.
Received: 17 October 2018 / Revised: 18 November 2018 / Accepted: 19 November 2018 / Published: 21 November 2018
(This article belongs to the Section Crop Breeding and Genetics)
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Abstract

Information on phytochemicals in the cob and husk of field corn is important for the use of corn waste in the production of value-added corn products. The objectives of this study were to evaluate the variation in monomeric anthocyanin content (MAC), total phenolic content (TPC), and antioxidant activity, as determined by 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging activity and Trolox equivalent antioxidant capacity (TEAC) in 53 purple field corn genotypes, and to study the correlations of these traits with color parameters. Fifty-three corn genotypes were planted in a randomized complete block design with three replications in two locations in the dry season of 2015/2016. The effects of genotype, location, and the interaction between genotype and location were significant for most characters. Genotypic variation contributed to a large portion of the total variance for all traits, accounting for 63.9–86.9%. Corn genotypes were classified into six groups based on MAC, TPC, and antioxidant activity determined by the DPPH and the TEAC methods. The highest MAC, TPC, and antioxidant activity were obtained in TB/KND//PF3 and TB/KND//PF8 for husk, and only TB/KND//PF8 for cob. They should be used as parental lines to develop corn varieties with high phytochemicals. Chroma (C*) and hue (H°) of color parameters could potentially be used as an indirect selection criterion for improving MAC, TPC, and antioxidant activity in cob. The information is useful for the improvement of phytochemicals in cob and husk of field corn. View Full-Text
Keywords: Zea mays L.; maize; germplasm; diversity; phytochemicals; colorimeter; pH-differential Zea mays L.; maize; germplasm; diversity; phytochemicals; colorimeter; pH-differential
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Khamphasan, P.; Lomthaisong, K.; Harakotr, B.; Ketthaisong, D.; Scott, M.P.; Lertrat, K.; Suriharn, B. Genotypic Variation in Anthocyanins, Phenolic Compounds, and Antioxidant Activity in Cob and Husk of Purple Field Corn. Agronomy 2018, 8, 271.

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