Cytogenetic Relationship between Solanum scabrum Mill. and S. americanum Mill
1987 年 52 巻 1 号 p. 91-96
詳細
1987 年 52 巻 1 号 p. 91-96
Crosses were made between S. scabrum Mill. and S. americanum Mill. with a view to understanding their interrelationship. The crosses were successful, only when the higher chromosomal form, i.e. S. scabrum was used as female parent.
Cytomorphological features of the species and hybrid were studied. The F1 hybrid was tetraploid with n=24 chromosomes. Although 70% pollen mother cells showed meiotic irregularities, a large number of fertile seed and stainable pollen were recorded. This could be due to genetic harmony between the parental species. The break-down of meiosis seems to be primarily due to chromosomal cause. From the occurrence of as few as 12 bivalents in almost all the pollen mother cells, it is suggested that S. americanum or one of its close relatives has participated in origin and evolution of S. scabrum.
