저선량 $gamma$선 조사가 토마토의 초기생육과 후속고선량 $gamma$선 저항성에 미치는 영향
김재성;김진규;백명화;김동희;
Effects of low dose $gamma$-ray on the early growth of tomato and the resistance to subsequent high doses of radiation
Kim, Jae-Sung;Kim, Jin-Kyu;Back, Myung-Hwa;Kim, Dong-Hee;
ABSTRACT
Tomato (Lycopericum esculentum $M_{ILL}$ cv. Seokwang and cv. Housemomotaro) seeds were irradiated with the doses of $1{sim}20$ Gy from $^{60}Co$$gamma$-ray source to investigate the effect of the low dose $gamma$-ray radiation on the early growth and resistance to subsequent high dose of radiation. Germination rate of seeds irradiated with low dose $gamma$-ray was enhanced in Seokwang cultivar but not in Housemomotaro cultivar. Seedling height increased in 4 Gy and 8 Gy irradiation group of both cultivars. Plant height of Seokwang cultivar was depressed in low dose irradiation group but fresh weight was increased in 2 Gy and 4 Gy irradiation group. In Housemomotaro cultivar, plant height increased in 12 Gy and 20 Gy irradiation group and fresh weight increased in 4 Gy and 20 Gy irradiation group. Growth inhibition of tomato plants by high dose radiation was noticeably reduced by pre-irradiation of low dose radiation. Resistance to subsequent high dose of radiation was enhanced in 2 Gy and 8 Gy Irradiation group of Seokwang cultivar and in 2 Gy and 12 Gy irradiation group of Housemomotaro cultivar.