Abstract
A general method for the production of somatic hybrids within Brassiceae has been developed using mesophyll protoplasts from one parent and hypocotyl protoplasts from the other. Fusion products were easily identified by their intermediate phenotype between the parental protoplasts. They could be isolated 24 h after fusion with micropipettes using a micromanipulator. At that time their frequency was about 15%. They were cultured in small volumes, 10 μl, and a plating efficiency of 14% was obtained. Hybrid calli were obtained from the fusion products, which was confirmed by isozyme analysis. Ploidy level of one hybrid shoot was determined by flow cytometric DNA analysis.
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