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Variation in Phenotypic Traits in Onion (Allium cepa L.) Germplasm Collections

  • Binod Prasad Luitel (Allium Vegetable Research Institute, National Institute of Horticultural and Herbal Science, Rural Development Administration) ;
  • JiWon Han (Allium Vegetable Research Institute, National Institute of Horticultural and Herbal Science, Rural Development Administration) ;
  • Myeong Cheoul Cho (Allium Vegetable Research Institute, National Institute of Horticultural and Herbal Science, Rural Development Administration) ;
  • Min-Seon Choi (Allium Vegetable Research Institute, National Institute of Horticultural and Herbal Science, Rural Development Administration)
  • 투고 : 2023.02.21
  • 심사 : 2023.04.14
  • 발행 : 2023.06.01

초록

Variations in phenotypic traits are important for onion genetic improvement. The aim of this study was to identify the phenotypic traits of temporary genetic resources and the best accessions for the development of onion breeding programs. Sixteen phenotypic traits of 79 onion accessions were studied. The descriptive statistics of phenotypic traits exhibited a high variation in onion accessions. Among the 79 evaluated accessions, 64.55% had a large bulb neck width and 44.30% had a circular bulb shape. Principal component analysis showed that six principal components (PCs) accounted for 72.65% of the total variation. The main factors contributing to PC1 were bulb weight, equatorial and bulb polar diameters, plant height, and degree of splitting into bulblets, whereas those contributing to PC2 were the bulb color of the epidermal cells of the fleshy scales and color of the dry skin on the bulb. The accessions were classified into three groups-clusters 1, 2, and 3. Cluster 2 accessions were the most suitable for selecting large and circular bulb-shaped onion cultivars. The phenotypic variation observed in this study may help to select potential accessions for breeding new onion cultivars.

키워드

과제정보

This work was carried out with the support of "Cooperative Research Program for Agriculture Science and Technology Development (Project No. PJ01423004)", Rural Development Administration, Republic of Korea.

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