무궁화 突然變異 育種을 위한 放射線感受性과 Chimera에 關한 硏究

Radiosensitivity and Chimera Formation in Hibiscus syriacus

Radiosensitivity of gamma-irradiated Hibiscus syriacus and chimera formation were investigated. The lethal dose 50 percent with respect to seeding and cuttings was 15kR and 2~3kR respectively, chlorophyll mutation rate of seeds irradiated with 15kR being about 13 percent. The degree of chimeric leaf mutants from the buds by radiation treatment depends on the bud position of the branch. Buds of the middle part of V₁ branch seemed to be more multi-cellular condition than the upper and low part when irradiation was made. It is assumed that at least two primordia of V₂ branch were already differentiated from the V₁ branch in Hibiscus syriacus plant.