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2023 Vol.36, Issue 3 Preview Page
Variation in Phenotypic Traits in Onion (Allium cepa L.) Germplasm Collections
Binod Prasad Luitel12
,
JiWon Han3
,
Myeong Cheoul Cho4
,
Min-Seon Choi3*
1Post-doc Researcher, Allium Vegetable Research Institute, National Institute of Horticultural and Herbal Science, Rural Development Administration, Muan 58545, Korea
2Senior Scientist, National Horticulture Research Center, Nepal Agricultural Research Council, Khumaltar, Lalitpur 5459, Nepal
3Researcher, Allium Vegetable Research Institute, National Institute of Horticultural and Herbal Science, Rural Development Administration, Muan 58545, Korea
4Senior Researcher, Allium Vegetable Research Institute, National Institute of Horticultural and Herbal Science, Rural Development Administration, Muan 58545, Korea
*Corresponding Author
1 June 2023. pp. 237-255
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Abstract

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.

Keywords
Accession
Cluster
Core collection
Phenotypic trait
Principal component
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Information
  • Publisher :The Plant Resources Society of Korea
  • Publisher(Ko) :한국자원식물학회
  • Journal Title :Korean Journal of Plant Resources
  • Journal Title(Ko) :한국자원식물학회지
  • Volume : 36
  • No :3
  • Pages :237-255
  • Received Date : 2023-02-21
  • Revised Date : 2023-04-12
  • Accepted Date : 2023-04-14
  • DOI :https://doi.org/10.7732/kjpr.2023.36.3.237
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