Abdullah, Nursyahida and Teng, Sing Tung and Hanifah, Afiqah Hamilton and Law, Ing Kuo and Tan, Toh Hii and Krock, Bernd and Harris, Thomas M. and Nagai, Satoshi and Lim, Po Teen and Tillmann, Urban and Leaw, Chui Pin (2023) Thecal plate morphology, molecular phylogeny, and toxin analyses reveal two novel species of Alexandrium (Dinophyceae) and their potential for toxin production. Harmful Algae, 127. ISSN 1568-9883, DOI https://doi.org/10.1016/j.hal.2023.102475.
Full text not available from this repository.Abstract
This study describes two novel species of marine dinophytes in the genus Alexandrium. Morphological characteristics and phylogenetic analyses support the placement of the new taxa, herein designated as Alexandrium limii sp. nov. and A. ogatae sp. nov. Alexandrium limii, a species closely related to A. taylorii, is distinguished by having a shorter 2'/4' suture length, narrower plates 1' and 6'', with larger length: width ratios, and by the position of the ventral pore (Vp). Alexandrium ogatae is distinguishable with its metasert plate 1' having almost parallel lateral margins, and by lacking a Vp. Production of paralytic shellfish toxins (PSTs), cycloimines, and goniodomins (GDs) in clonal cultures of A. ogatae, A. limii, and A. taylorii were examined analytically and the results showed that all strains contained GDs, with GDA as major variants (6-14 pg cell-1) for all strains except the Japanese strain of A. limii, which exclusively had a desmethyl variant of GDA (1.4-7.3 pg cell-1). None of the strains contained detectable levels of PSTs and cycloimines.
| Item Type: | Article |
|---|---|
| Funders: | Ministry of Higher Education, Malaysia, Higher Institution Centers of Excellence Grant and Long-term Research Grant Scheme (LRGS) (HICoE IOES-2023B), Long-term Research Grant Scheme (LRGS) (UNI/F07/RISE/85756/2023), Universiti Malaysia Sarawak RISE award (LRGS/1/2020/UMT/01/1/3), PACES II research program of the Alfred-Wegener-Institute (AWI) as part of the Helmholtz Foundation initiative in Earth and Environment |
| Uncontrolled Keywords: | Alexandrium; Goniodomins; Harmful algal bloom; ITS secondary structure; Paralytic shellfish toxins; Taxonomy; Thecal plates |
| Subjects: | S Agriculture > SH Aquaculture. Fisheries. Angling |
| Divisions: | Deputy Vice Chancellor (Research & Innovation) Office > Institute of Ocean and Earth Sciences |
| Depositing User: | Ms. Juhaida Abd Rahim |
| Date Deposited: | 18 Aug 2025 02:23 |
| Last Modified: | 18 Aug 2025 02:23 |
| URI: | http://eprints.um.edu.my/id/eprint/50724 |
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