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

in HortScience

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.

Contributor Notes

This study was supported by Key Techniques of the Flower Seed Industry with Chinese Characteristics (2012BAD01B07), the National Natural Science Foundation of China (31272205), the National Special Public Welfare Project (2005DIB3J022), the Science and Technology Innovation Program of the Chinese Academy of Agricultural Sciences, and the Key Flower Projects of Beijing (YLHH2006001, YLHH201300101). This research was conducted at the Key Laboratory of Biology and Genetic Improvement of Horticultural Crops, Ministry of Agriculture, China.

Corresponding author. E-mail: mingjun@caas.cn.

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