Rose is one of the most economically important ornamental crops worldwide. Although rose products are widely used, limited genetic and genomic data from this species is available. Fundamental genetic knowledge can accelerate the development of superior rose germplasms. In the present study, we explored the genetic data (e.g., chromosome numbers, total chromosome length, and ploidy level) of 39 rose cultivars using conventional cytogenetic methods. Of the 39 rose cultivars tested, 36 (92.3%) were tetraploid (2n = 4x = 28). ‘Rosada,’ ‘Rosemarin,’ and ‘Hanmaum’ were diploid (2n = 2x = 14), triploid (2n = 3x =21), and tetraploid-based aneuploid (2n = 4x = 28 + 2), respectively. The total chromosome length ranged from 46.03 ± 0.55 μm in ‘Rosada’ (2x) to 138.51 ± 0.92 μm in ‘Christoper’ (4x). The chromosome information obtained in this study will be useful for rose breeding and germplasm evaluation.

Abstract
Introduction
Materials and Methods
    Plant Material
    Metaphase Chromosome Preparation
    Image Acquisition
Results and Discussion
References

• Yan Wang(Department of Convergence Science, Sahmyook University)
• Ki-Byung Lim(Department of Horticultural Science, Kyungpook National University)
• Seung Tae Kim(Gumi Floriculture Research Institute, Gyeongsangbuk-do Agricultural Research & Extension Services)
• Won Hee Kim(Floriculture Research Division, National Institute of Horticultural & Herbal Science)
• Yoon-Jung Hwang(Department of Convergence Science, Sahmyook University) Corresponding author