Abstract

Investigations were carried out in the course of establishing an in vitro germplasm bank to determine the response of a number of genotypes to shoot tip culture and various low temperature (6°C) culture storage treatments. Average multiplication rates in shoot tip culture in R. nigrum cultivars ranged from 1.5 in Seabrooks Black to 3.5% in Ben Lomond. Survival following cold storage for 3 weeks was 95-100%. For each genotype tested multiplication rates in at least one treatment were better than in the control.