Cytogenetic Study of Interesting Five Genera and Six Species of Araceae from Thailand

The chromosome number and karyotype formula of interesting five genera and six species of Araceae from Thailand were studied, including Lasia spinosa —uncommon local Thai vegetable species (2n=26, L6sm+L2st+Mm14+M4sm), Pistia stratiotes—common aquatic plant (2n=28, Lm10+Mm18), Pycnosphata palmata—rare plant endemic to Laos and Thailand (2n=26, Lm12+L4sm+M6m+M2sm+M2st), Scittomaglottis calyptrata—rare plant in Thailand (2n=26, Lm6+L2sm+Mm6+Msm12), Typhonium glaucum—rare plant endemic to Thailand (2n=24, Lm6+Mm4+M6sm+Sm4+S4sm), and T. trilobatum—common Thai medicinal plant (2n=18, Lsm2+L6st+Mm2+Sm8). Satellites in karyotypes of Py. palmata, S. calyptrata, and T. glaucum were observed. The symmetry karyotype formula is reported in four species, while the asymmetry karyotype formula is found in two species. The somatic chromosome numbers of two species are recorded for the first time and five species have never had their karyotypes studied previously. The NF of all species is reported for the first time. The somatic chromosome numbers, NF, karyotype formulae, and satellites in this study can be used for identification.