Cytogenetical Investigations into Some Garden Ornamentals I

抄録

Cytogenetical studies in garden cultivars of Amaryllis vittata, Narcissus tazetta, Hemerocallis aurantiaca and H. fulva revealed their existance as different cytotypes. The karyotype was symmetrical in all these excepting N. tazetta which showed an asymmetrical karyotype. The role of chromosomal repatternings and hybridization is evident in the evolution of these taxa. Irregular segregation of small chromosomes probably accounts for the aneusomatic cells in Hemerocallis aurantiaca and Amaryllis vittata (cultivar ‘b’). The following karyotypes were established:
Amaryllis vittata L.:
cultivar ‘a’-K(2n)=22=B^st₄+B^sm₂+C^sm₂+C^st₄+D^st₂+E^m₄+E^sm₂+E^st₂
cultivar ‘b’-K(2n)=44=B^sm₂+C^sm₂+C^st₁₄+D^st₉+E^m₇+E^st₁+F^st₂
Narcissus tazetta L.:
pale-yelow cultivar-K(2n)=32=C^st₅+D^m₁+D^st₄+D^t₄+E^st₃+F^m₁+F^sm₁+F^st₁₃
dark-yillow cultivar-K(2n)=30=C^st₂+D^sm₂+D^st₁₀+E^sm₂+E^st₃+F^sm₂+F^st₉
Hamerocalis aurantiaca Bak.:
K(2n)=33=E^m₃+E^t₁+F^m₃+F^sm₁₇+F^st₃+G^m₂+G^sm₄
H. fulva L.:
K(2n)=22=E^m₂+E^sm₂+F^m₃+F^sm₄+F^st₈+F^t₂+G^m₁