Genotypic Responses to Cytokinin Requirements in Callus Culture of Korean Varieties of Phaseolus vulgaris L.

강남콩(Phaseolus vulgaris L.) 국내품종의 조직배양에서 유전자형에 따른 Cytokinin 요구성

Callus culture of Phaseolus vulgaris L. was carried out to examine the ability to grow on cytokinin-free medium. Of the sixteen cultivars of P. vulgaris, eight were classified as completely cytokinin-autonomous phenotype and five were found to be cytokinin-dependent phenotype. Intermediate phenotype was shown in three cultivars. Using cv. Palgong and ca 21 as cytokinin-dependent genotypes, the genotype responses to the cytokinin requirements of callus tissue were studied in detail. The callus tissue of cv. Palgong and ca 21 were never habituated in cytokinin-free medium, regardless tissue origin and cytokinin concentration in previous passages. The result suggests that cytokinin dependency of callus tissue of P. vulgaris cv. Palgong and ca 21 may be due to inactivation of cytokinin biosynthetic pathway.