Ploidity level and heterochromatin distribution in species from genus Polystachya (Orhidaceae)

Šafran, Marko (2012) Ploidity level and heterochromatin distribution in species from genus Polystachya (Orhidaceae). Diploma thesis, Faculty of Science > Department of Biology.

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Abstract

Polystachya Hook. consists of approximately 240 species, ranging over a wide geographic area. Up to now a very small number of papers dealing with molecular cytogenetics and phylogeny of the genus Polystachya were published. Last cytological analysis was made in year 1979 but it included only a small number of species. This research has involved the largest number of species so far, analyzing total number of 33 species from wide geographical area with the purpose of determining the correct number of chromosomes within the genus Polystachya. It was found that the genus Polystachya is very homogeneous in the context of chromosome number. Basic complement contains twenty chromosomes (x=20). Most of the species are diploids with 2n=2x=40 chromosomes, while 8 species are tetraploid (2n=4x=80) and only one specie is hexaploid (2n=6x=120). There are no significant variations in the distribution and position of heterochromatin within the genus. Most of the species posses heterochromatin blocks located in the pericentromeric region.

Item Type: Thesis (Diploma thesis)
Keywords: Polystachya, chromosome number, heterochromatin
Supervisor: Besendorfer, Višnja and Mlinarec Novosel, Jelena
Date: 2012
Number of Pages: 36
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Grozdana Sirotic
Date Deposited: 03 Mar 2014 13:13
Last Modified: 22 Sep 2014 08:33
URI: http://digre.pmf.unizg.hr/id/eprint/511

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