Four diploid strawberry species including Fragaria gracilis A.Los, F.
nilgerrensis Schidl, F. pentaphylla A.Los. and F. vesca L., a pentaploid
strawberry Heilongjiang No. 5 strawberry , two octoploid strawberry F.
virginiana Duch. and F. X ananassa Duch. were used to analyze the
chromosome karyotype and observe the cytological behavior of 2n gamete
formation. The karyotype formula of each strawberry studied w...