TRIPLOIDS IN CUCUMBER - II - CHARACTERIZATION OF EMBRYO RESCUE PLANTS

The ploidy effect in three lines of different origin was analysed. It was confirmed that this was dependent on the line, although some trait s were common. The following new traits appeared in the triploids: par thenocarpy, increased fruit size, stronger femaleness, seedlessnesss, new classes pollen size, a marked decrease of pollen fertility, appear ance of pollen with 4-6 pollen-tube holes, and larger flower crown. Th e specifics of the lines manifested themselves in the changing values of the following traits: plant hight, number of male and female nodes, parthenocarpy. Among particularly useful triploid traits should be re cognised a fruit setting rate of 13-41% without any pollination, and 9 -11 fold increase in fruit setting as a result of pollination by diplo id plants.In only one case it was possible to obtain triploids if the 2x line was used as a maternal parent. However many of their character were worse as in reversal cross.