Abstract
Glucosinolates, lipid-soluble vitamins E and K contents, primary metabolites and plant hormones were analyzed from topped radish root and detached leaf during storage at 1 °C. The topped root was analyzed at 0, 5, 15, 30, and 90 days after storage while the detached leaf was analyzed at 0, 5, 15, 30, and 45 days in an airtight storage atmosphere environment. The results showed that aliphatic glucosinolates were gradually decreased in leaf but not in root. There was a highly significant correlation between tryptophan and 4-methoxyindoleglucobrassicin in both tissues (r = 0.922, n = 10). There was no significant difference in vitamins E and K in leaf and root during storage. Plant hormones partially explained the significantly changed metabolites by tissue and time, which were identified during cold storage. Phenylalanine, lysine, tryptophan, and myo-inositol were the most important biomarkers that explained the difference in leaf and root tissue during cold storage. The most different metabolism between leaf and root tissue was starch and sucrose metabolism. Therefore, different postharvest technology or regimes should be applied to these tissues.
Highlights
Radish (Raphanus sativus L.) is an edible root vegetable, radish leaf is consumed in few Asian countries [1]
A total of 14 glucosinolates were detected in radish with different storage times, including 8 aliphatic, 5 indole, and 1 aromatic glucosinolates
Glucoraphasatin and glucoraphenin are the major aliphatic glucosinolates in radish leaf and root, which was in agreement with the study of [42]
Summary
Radish (Raphanus sativus L.) is an edible root vegetable, radish leaf is consumed in few Asian countries [1]. In South Korea, radish leaf is called “mucheong” and is a widely consumed food [2]. In China, radish leaf is widely consumed in soup and pickles. Recent publication has reported that ethyl acetate extract of radish leaf had a significant effect on blood pressure regulation in rats [3]. Radish root can be stored up to 6 months at cold storage 0–3 ◦ C [4]. Radish leaf may contain beneficial phytonutrients including glucosinolates and vitamins E and K, similar to kale or collards [6], but there is very little information on such phytonutrients during postharvest storage [4]
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