ผลของรังสีแกมมาต่อลักษณะสัณฐานในปทุมมาพันธุ์ลูกผสม

Abstract

Acute gamma irradiation on Curcuma hybrid (Curcuma alismatifolia x Curcuma sparganifolia) was used to study on retarded shoots at the doses of 0, 10, 20, 30, 40 and 50 grays, followed by transferring the plants into greenhouse for growing. The results showed that exposure to gamma radiation caused reduction of plant growth. The relationship between concentration of gamma radiation and survival percentage was graphed to get LD₅₀₍₃₀₎. It was found that 23 grays radiation resulted in 50 % survival after 30 days. The flower color of 2 plants treated with gamma ray at 20 grays was changed to pink (red-purple group 74C) and light pink (red-purple group 74D) compared to that of the control which was purple (red-purple group 70A). Higher doses reduced vegetative growth. The results of this study can be used as a guideline for the improvement varieties of Curcuma spp. by inducing gamma mutation. Gamma irradiation with more than 20 grays can induce morphological changes, such as flower bract.