Abstract
To breed an improved 'Morioka-16' which is resistant to Alternaria black spot, caused by Alternaria alternate strawberry pathotype, culture-caused mutagenesis was used. Calliclones induced by shoot apex culture of cv. Morioka-16 were inoculated with the pathogen by three screening methods.Using one of these methods, three plants resistant to the disease were successfully selected from 1196 calliclones which had been inoculated with the pathogen.These three mutants were named 'M16-AR 1', 'M16-AR 2' and 'M16-AR 3' and their plant and fruit characters were examined. No differences between cv. Morioka-16 and the three mutants were found in terms of plant height, leaf number, flowering time, harvesting time, yield, and fruit characters.
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