Umakanta Sarker1,2, Shinya Oba1. 1. Laboratory of Field Science, Faculty of Applied Biological Sciences, The United Graduate School of Agricultural Science, Gifu University, Gifu, Japan. 2. Department of Genetics and Plant Breeding, Faculty of Agriculture, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur, Bangladesh.
Abstract
BACKGROUND: Amaranthus tricolor is a unique source of betalain (β-cyanin and β-xanthin) and a source of natural antioxidants, such as leaf pigments, vitamins, polyphenols and flavonoids in leafy vegetables. It has substantial importance for the food industry, since these compounds detoxify reactive oxygen species in humans and are involved in defense against several diseases. In addition, previous research has shown that salt stress elevates these compounds in many leafy vegetables. Therefore, we evaluated the effect of salinity stress on these compounds. RESULTS: Three selected A. tricolor genotypes were studied under three salinity levels to evaluate the response of these compounds. Genotype, salinity stress and their interactions significantly affected all the traits studied. A significant and remarkable increase in L, a*, b*, chroma, β-cyanin, β-xanthin, betalain, total carotenoids, β-carotene, ascorbic acid, total polyphenolic content, total flavonoid content and total antioxidant capacity were observed under 50 and 100 mmol L-1 NaCl concentrations. Bioactive leaf pigments, β-carotene, vitamin C, phenolics and flavonoids showed good antioxidant activity due to positive and significant interrelationships with total antioxidant capacity. CONCLUSIONS: Amaranthus tricolor can tolerate salinity stress without compromising the high quality of the final product. Therefore, it could be a promising alternative crop in saline-prone areas around the globe.
BACKGROUND:Amaranthus tricolor is a unique source of betalain (β-cyanin and β-xanthin) and a source of natural antioxidants, such as leaf pigments, vitamins, polyphenols and flavonoids in leafy vegetables. It has substantial importance for the food industry, since these compounds detoxify reactive oxygen species in humans and are involved in defense against several diseases. In addition, previous research has shown that salt stress elevates these compounds in many leafy vegetables. Therefore, we evaluated the effect of salinity stress on these compounds. RESULTS: Three selected A. tricolor genotypes were studied under three salinity levels to evaluate the response of these compounds. Genotype, salinity stress and their interactions significantly affected all the traits studied. A significant and remarkable increase in L, a*, b*, chroma, β-cyanin, β-xanthin, betalain, total carotenoids, β-carotene, ascorbic acid, total polyphenolic content, total flavonoid content and total antioxidant capacity were observed under 50 and 100 mmol L-1 NaCl concentrations. Bioactive leaf pigments, β-carotene, vitamin C, phenolics and flavonoids showed good antioxidant activity due to positive and significant interrelationships with total antioxidant capacity. CONCLUSIONS:Amaranthus tricolor can tolerate salinity stress without compromising the high quality of the final product. Therefore, it could be a promising alternative crop in saline-prone areas around the globe.
Authors: Spyridon A Petropoulos; Ângela Fernandes; Maria Ines Dias; Carla Pereira; Ricardo C Calhelha; Antonios Chrysargyris; Nikolaos Tzortzakis; Marija Ivanov; Marina D Sokovic; Lillian Barros; Isabel C F R Ferreira Journal: Molecules Date: 2020-05-08 Impact factor: 4.411