Biotechnology & Biotechnological Equipment 18 (2), 95 - 98 (2004)
Using PEG as selective agent under in vitro conditions we were able to distinguish Bulgarski rubin and Elite 1 as osmotic tolerant. Shopska alena, Samodiva, Lyulin and Elite 3 were with reduced growth and membrane integrity of the tissues. Further studies are in progress to compare the reaction to osmotic stress in vitro with the response to drought under field conditions. This will help us to improve and speed up the raspberry breeding program.