Evaluation of forty-fi ve cultivars as aff ected by bulb initiation, bulb and scale characteristics, and bulb minerals and organic compounds of intermediate-day yellow onion ( Allium cepa L.) in South Korea

다국어 초록 (Multilingual Abstract)

We evaluated and classifi ed forty fi ve onion cultivars according to bulb initiation, bulb and scale characteristics, mineralsand organic compounds contents, and storage quality in South Korea during 2016/2017 and 2017/2018 growing seasons.
Field experiment was conducted in randomized block design with three replications. Bulb initiation ranged from 153 daysafter transplanting (DAT, April 2) to 177 DAT (April 26). Fresh bulb weight (FBW) and bulb index (BI) were 285.5 ± 18.5 g/individual, 0.93 ± 0.05, respectively. Number of scales (NS), number of center (NC), and scale thickness (ST) were 7.6 ± 0.2,2.3 ± 0.2, and 5.5 ± 0.2 mm/scale, respectively. Chroma and Lightness of bulb skin were 27.1 ± 1.9, 61.2 ± 2.3, respectively.
Storage loss (SL) on December 12 was 19.4 ± 5.9%. Nitrogen (N), Carbon (C) and sulfur (S) contents were 1.36 ± 0.14,37.9 ± 3.2 and 0.40 ± 0.06 mg kg −1 on a fresh weight basis. Total soluble solids (TSS) and total phenolics content (TPC) were8.6 ± 0.6 °Bx, 164.8 ± 15.6 mg GE kg −1 on a fresh weight basis. Days from transplanting to bulb initiation was signifi cantlypositively correlated with bulb height, NC, dry matter, N, C, S, TSS, TPC, total fl avonoids content (TFC) etc., while it wasnegatively correlated with rot loss and SL. Dry matter content was signifi cantly positively correlated with N, C, S, TSS,TPC, TFC etc., while it was negatively correlated with SL. Storage loss was negatively correlated with N, S, Potassium andTSS. Dendrogram of agglomerative hierarchical clustering for the forty fi ve cultivars based on bulb initiation, bulb and scalecharacteristics, and bulb minerals and organic compounds contents classifi ed fi ve cultivar groups. Cluster 1 featured the earliestbulb initiation and the greatest SL. Cluster 2 featured the fewest NS and NR, and the thickest ST. Cluster 3 featured thegreatest FBW, and the most NS and NC. Cluster 4 featured the greatest BI and the thinnest ST. Cluster 5 featured the lowestSL, and the highest minerals and antioxidant compounds contents. This information should be helpful for onion growers todecide onion cultivar and for onion breeders to promote new cultivars depending on their purpose.

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