Chromosome Numbers and Other Karyological Data of Four Stemona Species (stemonaceae) from Thailand
نویسندگان
چکیده
Chromosome numbers and other karyological data of four Stemona spp. (Stemonaceae) from Thailand are reported. Three taxa (S. collinsae Craib, S. kerrii Craib and an unidentified species) exhibit 2n = 14 chromosomes, for S. curtisii Hook.f. a range of 2n = 13–16 was established. Based on the counts of c. 30% of the species of Stemona, x = 7 is very likely to be the basic number for the genus. Chromosome size and morphology of the investigated species are compared with literature data and show differences that might be of importance for infrageneric classification. In this connection the taxonomic position of the genus Pentastemona from Sumatra is also discussed.
منابع مشابه
Two new N-oxide alkaloids from Stemona cochinchinensis.
Two new N-oxide alkaloids with pyrrolo[1,2-α]azepine skeleton, namely isoneostemocochinine-N-oxide (1) and neostemocochinine-N-oxide (2), as well as three known alkaloids with pyrido[1,2-α]azepine skeletons, were isolated and identified from the roots of Stemona cochinchinensis (Stemonaceae). The structures of these compounds were elucidated by 1D- and 2D-NMR spectra and other spectroscopic stu...
متن کاملKaryological and molecular analysis of three endemic loaches (Actinopterygii: Cobitoidea) from Kor River basin, Iran
This study provides new data on chromosomal characteristics and DNA barcoding of three endemic loaches of Iran: spiny southern loach Cobitis linea (Heckel, 1847), Persian stream loach Oxynoemacheilus persa (Heckel, 1848) and Tongiorgi stream loach Oxynoemacheilus tongiorgii (Nalbant & Bianco, 1998). The chromosomes of these fishes were investigated by examining metaphase chromosome spreads obta...
متن کاملStemona alkaloids isolated from Stemona tuberosa roots and their inhibitory activity on lipopolysaccharide-induced nitric oxide production
Abstract: A methanol extract of the roots of Stemona tuberosa (Stemonaceae) significantly inhibited lipopolysaccharide-induced nitric oxide production in murine BV2 microglial cells. Eight alkaloids tuberostemonine K (1), neotuberostemonine (2), oxotuberostemonine (3), bisdehydroneotuberostemonine (4), epibisdehydrotuberostemonine J (5), bisdehydrotuberostemonine (6), tuberostemoninol (7), and ...
متن کاملActivity of novel plant extracts against medullary thyroid carcinoma cells.
BACKGROUND Medullary thyroid carcinoma (MTC) is a rare calcitonin-producing tumor, derived from the parafollicular C-cells of the thyroid. MTC is known to be relatively insensitive to conventional chemotherapy. MATERIALS AND METHODS Eight cell lines were established from MTCs; each showed an up-regulation of Bcl-2. We investigated ten agents from plants of the genera Stemona (Stemonaceae), Ag...
متن کاملKARYOTYPIC STUDY OF TRIFOLIUM SPECIES AND CULTIVARS IN IRAN
Trifolium species and cultivars are considered important forage crops iran , growing throughout the country. The present article considered the karyotypic details of Trvulim taxa using multivariate statistical analysis. Taxa studied included: Trifolim restylinatum (six populations: Shazand, Soriyan, Kordestan, Harati, Enaj and Lordegan), T. repense, T, fragverm, T. prateme and T, alexandrin...
متن کامل