Plant Regeneration from Shoot Tips in Triploid Loquat

Plant regeneration was completed for the first time using shoot tips as the explants harvested from a triploid mother plant in loquat. A series of experiments were carried out to investigate the effects of sampling time and the size of the explants, growth regulators on shoot tip sprouting, elongation, rooting and transplantation. The results showed that sampling in spring and shoot-tip size of 0.7 cm were appropriate, resulting in a survival rate of77.5%. Appropriate initial culture medium was MS+6-BA 1.0 mg/L+NAA 0.5 mg/L+NAA 1.5 mg/L, in which the sprouting rate reached 91%. Suitable medium for shoot elongation was MS +6-BA 0.5 mg/L +NAA 0.3 mg/L +GA30.3 mg/L,which resulted in an average shoot height of 4.9 cm. The most suitable medium for shoot proliferation was MS+6-BA1.0 mg/L+NAA 0.3 mg/L+Tryptone 750 mg/L, in which a high multiplication coefficient of 7.7 was obtained. The most suitable medium for rooting was 1/2MS+NAA 0.25 mg/L+IBA 2.0 mg/L, in which the rooting rate was 73.3%.The rooted plantlets, after hardening, survived at a rate of 93.67% in the transplantation matrix of decomposed organic fertilizers, garden soil and sawdust(1 ∶ 2 ∶ 1) under careful temperature and water management.