パプアニューギニア産植物数種の染色体 A Cytological Study of Some Plants from Papua New Guinea

パプアニューギニアにそのほとんどが自生する被子植物12科12属12種について,若い葉及び根端細胞を用いて調べた体細胞染色体の数と核型を報告する。このうち4属(Holochlamys, Lamiodendron, Sericolea, Eriandra)は固有層であり,調べた12種のうち10種については初めての報告である。染色体数は以下の通りである。Anisoptera thurifera(フタバガキ科)は2n=22,Carpodetus arboreus(カルポデツス科)は2n=30,Corynocarpus cribbianus(コリノカルプス科)は2n=44,Drypetes cf. bordenii(ハツバキ科)は2n=40,Eriandra fragrans(ヒメハギ科)は2n=28,Euroschinus papuanus(ウルシ科)は2n=48,Holochlamys beccarii(サトイモ科)は2n=30,Lamiodendron magnificum(ノウゼンカズラ科)は2n=48,Nothofagus grandis(ナンキョクブナ科)は2n=26,Sericolea sp.(ホルトノキ科)は2n=30,Stemonures cf. ammui(クロタキカズラ科)は2n=44,Trimenia papuana(トリメニア科)は2n=16の染色体数をもつことが明らかにされた。

Somatic chromosome numbers for 12 species in 12 genera and 12 families native to Papua New Guinea, and karyotypes of 9 of those species, in meristematic cells of young leaves and root tips are reported. Four endemic genera, Holochlamys, Lamiodendron, Sericolea, and Eriandra, were included in the study. Of the 12 species investigated, 10 were studied for the first time cytologically. The chromosome number of 2n=22 was found in Anisoptera thurifera (Dipterocarpaceae), 2n=30 in Carpodetus arboreus (Carpodetaceae), 2n=44 in Corynocarpus cribbianus (Corynocarpaceae), 2n=40 in Drypetes cf. bordenii (Putranjivaceac), 2n=28 in Eriandra fragrans (Polygalaceae), 2n=48 in Euroschinus papuanus (Anacardiaceae), 2n=30 in Holochlamys beccarii (Araceae), 2n=48 in Lamiodendron magnificum (Bignoniaceae), 2n=26 in Nothofagus grandis (Nothofagaceae), 2n=30 in Sericolea sp. (Elaeocarpaceae), 2n=44 in Stemonures cf. ammui (Icacinaceae), and 2n=16 in Trimenia papuana (Trimeniacea).