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Lilium davidii  var.  unicolor  Salisb is a cultivar of  Lilium  (Liliaceae) with important edible and ornamental characteristic. The application and production of  Lilium davidii  var.  unicolor  Salisb were still facing large problems because of its several disadvantages such as narrow range of adaptability, small annual growth increment, and low fertility. To achieve broader environmental adaptability and obtain a more nutritious germplasm, we used colchicine and oryzalin to induce chromosome doubling via the soaking method. Tissue culture bulbs were treated with colchicine at 0.03%, 0.05%, or 0.08% for 32, 40, or 48 hours or with oryzalin at 0.002%, 0.005%, 0.008%, or 0.01% for 3, 6, 9, 12, or 24 hours before being transferred to a differentiating medium. The results showed that colchicine treatment resulted in the highest induction rate when applied at 0.05% for 48 hours, whereas oryzalin treatment produced fewer tetraploid plants. The chromosome number of induced plants with small stoma density and longer guard cells is twice than that of the diploid. The plants were identified as tetraploid. In this study, a new germplasm of  Lilium davidii  var.  unicolor  Salisb was innovative and showed novel genetic characteristic.

Production and Identification of a Tetraploid Germplasm of Edible Lilium davidii var. unicolor Salisb via Chromosome Doubling