HYPERSENSITIVITY IN PLUM BREEDING - NEW RESULTS

In a breeding cycle from the years 1998 to 2002, we crossed `Jojo' and his sibling `Ort. x Stan. 34' with 25 different late ripening cultivars. We received more than 2500 seedlings. From this material were selected 56 clones for a second selection stage carried out in different regions. 43 of these clones showed strong hypersensitivity resistance to the Sharka virus. The clones are ripening between the end of July and the beginning of October. There is a variation in fruit weight between 18 and 88 g. Results of the second selection stages are discussed. In a new breeding cycle from 2002 to 2005 crossings were made with the following breeding aims: Early or late ripening, large fruit size, hypersensitivity resistance to Sharka disease; quality, fruit size and hypersensitivity. From crossings with 11 different cultivars, we obtained 467 seedlings. First fruits have been harvested in 2006. Interesting clones were tested for hypersensitivity resistance. First results concerning the pomological value are presented.     «

In a breeding cycle from the years 1998 to 2002, we crossed `Jojo' and his sibling `Ort. x Stan. 34' with 25 different late ripening cultivars. We received more than 2500 seedlings. From this material were selected 56 clones for a second selection stage carried out in different regions. 43 of these clones showed strong hypersensitivity resistance to the Sharka virus. The clones are ripening between the end of July and the beginning of October. There is a variation in fruit weight between 18 and...     »