Usman, Aminu Surajo (2025) Investigation Of Toxin Production, Stress Tolerance And Compatible Solute Utilisation By Benthic Cyanobacteria Isolated From Antarctica. PhD thesis, Perpustakaan Hamzah Sendut.
![[img]](http://eprints.usm.my/style/images/fileicons/application_pdf.png) |
PDF
Download (585kB) |
Abstract
Cyanobacteria dominate the antarctic ecosystem due to their remarkable adaptability to diverse conditions, including changing salinity. However, limited information exists about their response to salt stress. This study aimed to identify cyanobacterial strains, assess cyanotoxin production, and examine their salt stress response. A total of 17 unialgal cyanobacteria strains were isolated from deep freeze mat samples collected from meltwater ponds, lakes, and hydro-terrestrial environments in cape royds, scott base, victoria valley, and mcmurdo ice shelf. Morphospecies identification was performed by observing major phenotypic features in the culture. In addition, molecular analysis of 16s rrna genes provided complementary information to enhance the morphological identification process. All strains were examined for the presence of genes involved in the biosynthesis of anatoxins (atxs), cylindrospermopsins (cyns), microcystins (mcs), and saxitoxins (stxs) using pcr-based methods. Two strains, phormidesmis priestleyi (cr147_usmfm) and microcoleus autumnalis (sb19_usmfm), tested positive for microcystin gene (mcye).
| Item Type: | Thesis (PhD) |
|---|---|
| Subjects: | Q Science > QH Natural history > QH1-278.5 Natural history (General) |
| Divisions: | Pusat Pengajian Sains Kajihayat (School of Biological Sciences) > Thesis |
| Depositing User: | Mr Hasmizar Mansor |
| Date Deposited: | 15 Apr 2026 01:21 |
| Last Modified: | 15 Apr 2026 01:21 |
| URI: | http://eprints.usm.my/id/eprint/63895 |
Actions (login required)
 |
View Item |
