ISHS Acta Horticulturae 159: Conference on Temperate Tree Fruits and Nuts Breeding
RESULTS OF INTERGENERIC FRAGARIA AND POTENTILLA SPP. CROSSES |
| Author: | K. Niemirowicz-Szczytt |
| Abstract:
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. | |
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