IN-VITRO PROPAGATION OF APRICOT (PRUNUS-ARMENIACA L.) CV BAKUOH-JUNKYOU

In vitro propagation by dormant, meristem culture of apricot (Prunus a rmeniaca L.) cv. 'Bakuoh junkyou' was investigated by placing 1 mm sho ot tips on four kinds of basal media (WP, MS, B5 and 1/2 MS) with cyto kinins. Judging by survival rates and shoot length, the best medium wa s WP supplemented with BA or CPPU with 100% survival, whereas WP suppl emented with 2 ip yielded 80% survival. For shoot proliferation, BA wa s most effective among 3 kinds of cytokinins tested, whereas zeatin an d 2 ip were more effective for shoot elongation. IBA promoted rooting, the optimum being 2 mu M; no rooting occurred without IBA treatment. The rooting ability of shoots increased with the number of subcultures ; a maximum of 86.7% was attained after the 20 th subculture.