Karyological Study in Three Thailand Species of <i>Colocasia</i> (Araceae)

Abstract

Cytogenetical studies in three Thailand species of genus Colocasia Schott, C. fallex, C. gigantea and C. lihengiae, were reported. The species had the same chromosomes number of 2n=28 and their karyotypes were formulated as 24m+4sm, 20m+6sm+2st (2 sat) and 18m+2sm+8st, respectively. Differences among three species appeared in the number of m, sm and st chromosomes as well as satellite. These karyological data were discussed intra-and inter-specific variation in the Colocasia species.

Karyological Study of Five Species <i>Boesenbergia</i> (Zingiberaceae) in Thailand

“…Root tips were stained and squashed in 2% aceto-orcein, and the chromosomes were observed using a light microscope (Zeiss: Axiostar plus). The chromosome study followed Senavongse et al (2018Senavongse et al ( , 2020 and Saensouk et al (2019). The nomenclature of the chromosome morphology followed Levan et al (1964).…”

Karyological Study of Four Species in <i>Callisia</i> and <i>Cyanotis</i> (Commelinaceae) from Thailand

“…All fresh specimens were grown in a nursery at the Walai Rukhavej Botanical Research Institute, Mahasarakham University, Maha Sarakham Province, Thailand. The chromosome number study followed Senavongse et al (2018Senavongse et al ( , 2020 and Saensouk et al (2019). The nomenclature of the chromosome morphology followed Levan et al (1964).…”

“…The chromosome number, chromosome length range, haploid chromosome length, arm ratio, relative length, and karyotype formula were determined from 20 metaphase cells in each species. For the arrangement of chromosomes in the karyotypes, the parameters average length of the short arm (Ls), the average length of the long arm (Ll), length of each chromosome (LT), average relative length (RL), chromosome index (CI) and standard deviations (SD) of RL and CI from metaphase chromosomes were calculated following the methods of Senavongse et al (2018Senavongse et al ( , 2020 and Saensouk et al (2019).…”

Karyotype analysis from four species of edible plants in northeastern Thailand

“…All four species were grown in a nursery at the Walai Rukhavej Botanical Research Institute, Mahasarakham University, Maha Sarakham Province, Thailand. The chromosome numbers study from root tips followed the methods of Saensouk et al (2019) and Senavongse et al (2018;2020). Photographs were taken using a light microscope (Zeiss: Axiostar plus) at 100× magnification.…”

“…The diploid chromosome numbers of each specimen in this study were counted from 20 cells. For the arrangement of the karyotypes, the following parameters, such as average length of the short arm (Ls), average length of the long arm (Ll), length of each chromosome (LT), average measurement of relative length (RL), chromosome index (CI), standard deviation (SD) of RL and CI from metaphase chromosomes, were calculated by the methods of Saensouk et al (2019), Senavongse et al (2018;2020), Saensouk and Saensouk (2021a) and Saensouk and Saensouk (2021b).…”