RESULTS OF INTERGENERIC FRAGARIA AND POTENTILLA SPP. CROSSES

Female varieties of Fragaria x ananassa (Sonja, Freja, Mieze Schindler, Dir.
Wallbaum, Reine des Precoces, Pozsnaja Slodkaja and others) were pollinated with nineteen Potentilla species.
A total of 99194 seeds was obtained, and from them 739 seedlings (0.75%). After the first year of growth a mean 24% of seedlings survived (178). In the second year of growth 131 (of 159) progeny was examined for morphological traits and was considered as matroclinous.
Matroclinous plants (MR₁) preserve traits of maternal species, but they show a variebility of these characters within the species.
They differ widely in ploidy.
Among 153 individuals tetraploids were most numerously represented (41%), next came penta- and hexaploids (36%), octoploids (8%), mixoploids and aneuploids (6.5%), triploids (5.5%) and others.

From among 119 matroclinous plants, 77 produced relatively highly viable seeds in open pollination, 33 gave seeds of low viability and 8 produce completely sterile seeds.
Preliminary examination of the progeny of matroclinous plants seems to indicate that it is possible to obtain a next fertile generation (MR₂) which, under conditions of controlled pollination, would preserve its initial ploidy.
Under the influence of open pollination the matroclinous plants exhibit a tendency to a return to higher ploidy.

Conference on Temperate Tree Fruits and Nuts Breeding

K. Niemirowicz-Szczytt

https://doi.org/10.17660/ActaHortic.1985.159.17