Varying light quality affects aesthetic morphology, phytochemistry, and consumer preference of ricebean (Vigna umbellata (Thunb.) Ohwi and H. Ohashi) microgreens
2024
Barlongo, A.J.P.
Light plays an important role in regulation physiological processes such as photomorphogenesis, growth, and development. Philippine indigenous crops that can be grown as microgreens, such as ricebean (Vigna umbellata), remain unexplored thereby revealing substantial gaps. Thus, this study aimed to evaluate how different light qualities impact the aesthetic morphology, phytochemical composition, and consumer preference of ricebean microgreens. Results revealed that exposure to varying light qualities significantly influenced epicotyl and leaf color in ricebean microgreens, particularly under dark conditions where both accessions displayed etiolated seedlings. Negros ricebean microgreens under red, purple, and white light showed approximately 50% epicotyl purple pigmentation, while Benguet ricebean microgreens under red, blue, purple, and white light and Negros ricebean microgreens under blue light, produced green microgreens. Phytochemical analysis indicated an augmentation in components compared to dark treatment. In light-exposed ricebean microgreens, total phenolic content (TPC) ranged from 73.47-78.70 mg GAE 100/g, total anthocyanin content (TAC) ranged from 10.02-13.13 mg CGE 100/g, while DPPH scavenging activity ranged from 15.45-20.07% inhibition. The purple pigmentation observed in the Negros accession was supported by a significantly higher amount of anthocyanin (12.82+- 0.72 mg CGE 100/g) compared to Benguet (9.26 +- 0.34 mg CGE 100/g). Consumer preference exploration among respondents (n=33) collectively underscore a clear inclination towards green microgreens which were Benguet accession grown under red, blue, purple, and white lights.
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