[Karyotype polymorphism in species of Daiswa hainanensis subsp. vietnamensis Takht].
Karyotypes of two plants Daiswa hainanensis (Merrill) Takht. subsp. vietnamensis from Northern Vietnam were investigated. On using nucleotid-specific fluorochromes, heterochromatin blocks rich in AT- and GC-nucleotid pairs were revealed. Parameters and idiograms of these karyotypes are given. In the karyotype of one plant, a somatic abbreviation (a clearly marked morphological heteromorphism of homologues) was found. The karyotype of the other plant contains a supernumerary chromosome of euchromatin nature. Cytogenetic features of the genus Daiswa corroborate the correctness of A. L. Takhtajan's suggestion that Daiswa is a separate genus. The population polymorphism as a base for speciation in the process of phylogenesis is discussed.
Kotseruba
V V
VV
Botanical Institute RAS, St. Petersburg. viola@mail.line.ru
D018745:Genome, Plant; D007621:Karyotyping; D019684:Magnoliopsida / Q000235:genetics*; D011110:Polymorphism, Genetic