Chromosome Complements of Isodon (Family: Lamiaceae–Subfamily: Nepetoideae): Trends in Karyotype Evolution
Proceedings of the National Academy of Sciences, India Section B: Biological Sciences - Tập 87 - Trang 267-272 - 2015
Tóm tắt
The use of Isodon in folk medicines has a long tradition. The tetracyclic compound ent-kaurane diterpenoids present in the genus have varied biological activities including antibacterial, anti-inflammatory and antitumor activity and makes it a good candidate in drug research. Being a cosmopolitan and important genus of the family Lamiaceae with considerable taxonomic dispute, a review on chromosome complements and its evolution is of great significance. The prevalence of confusion regarding the members of the genus makes it obligatory to include the synonymised members also. Hence, the review is made inclusive of Rabdosia, Isodon and members of Plectranthus which have now been included under the genus Isodon. The chromosome counts of all the reported species of Isodon have been examined and the haploid chromosome number was found to be n = 12. Except for the two species Isodon lophanthoides and Isodon ramosissimus for which the chromosome counts were reported as 2n = 36 and 2n = 42 respectively, all other species had 2n = 24 as its diploid count. The secondary basic chromosome number of x2 = 12 prevalent in majority of the taxa might have evolved from the primary base number x1 = 6 via protoautoploidy.
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