AI Article Synopsis
- The paper presents chromosome counts and karyotypes for two species of Chrysolaena, revealing both taxa have a basic chromosome number (x=10) common to the genus.
- The study reports the first chromosome count for Chrysolaena cristobaliana, identifying it as heptaploid (2n=7x=70) and detailing its karyotype, while also providing information on the tetraploid (2n=4x=40) karyotype of Chrysolaena sceptrum.
- Both species exhibit accessory chromosomes and differ in chromosome number and total length, but share similarities in morphology and asymmetry indexes, suggesting that chromosome data can be useful for classifying members of the Vernonie
Article Abstract
Chromosome counts and karyotypes of two species of Chrysolaena H. Robinson 1988 are presented in this paper. Mitotic analysis revealed that both taxa have x=10, a basic chromosome number considered characteristic of the genus. The chromosome number and the karyotype of Chrysolaena cristobaliana are reported for the first time, as well as a new cytotype and the karyotype of Chrysolaena sceptrum. Chrysolaena cristobaliana showed heptaploid cytotype with 2n=7x=70 and a karyotype composed of 46 m + 24 sm chromosomes. On the other hand, Chrysolaena sceptrum presented tetraploid cytotype with 2n=4x=40 and a karyotype with 30 m + 10 sm chromosomes. Accessory chromosomes were observed in cells of both species. The chromosome analysis showed that these species differ in the chromosome number and the total chromosome length, although they showed similar chromosome morphology and asymmetry indexes. The results support the use of chromosome data in taxonomic treatments of the American members of the tribe Vernonieae.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4137283 | PMC |
| http://dx.doi.org/10.3897/CompCytogen.v8i2.7209 | DOI Listing |
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