CYTOLOGICAL ANALYSIS IN APPLE BREEDING WITH POLYPLOIDY USING
The ploidy analysis of apple hybrid seedling obtained from crossings with different number of chromosomes from four hybrid families showed 86,8% of triploid seedlings. The ploidy determination of genotypes, initial and selected forms made it possible to reveal the plants with different ploidy levels (triploids, tetraploids and diploids). Having studied the reductional division of tetraploid apple form №32 [25-35-144 (Wealthy tetraploid x Papirovka tetraploid) x 29-35-127 [Arbat x 23-15-38 (814 - open pollination)]] it was concluded that this apple form was suitable as a pollinator in the intervalent crossings since the most part of microsporocytes had correct pictures of meiotic division and formed 80% of one-sized diploid pollen.