Cryptic speciation of benthic Prorocentrum (Dinophyceae) species and their potential as ecological indicators

Wu, Yixuan; Huang, Shuning; Krock, Bernd; Leaw, Chui Pin; Teng, Sing Tung; Piumsomboon, Ajcharaporn; Punnarak, Porntep; Roeroe, Kakaskasen Andreas; Wang, Na; Gu, Haifeng

doi:10.1016/j.seares.2022.102304

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“…This is indicative that size range cannot be used to distinguish between these closely related species. In this study, the phylogenetic analyses of LSU rDNA (D1⁄D2) regions showed the intermixing of strains reported under Prorocentrum fukuyoi, Prorocentrum emarginatum, and Prorocentrum emarginatum/fukuyoi and recovered four clades in agreement with Wu et al [39]. Our result indicated that ISOP40 fell within the clade from the type material.…”

Section: Discussionsupporting

confidence: 89%

Ribosomal DNA Sequence-Based Taxonomy and Antimicrobial Activity of Prorocentrum spp. (Dinophyceae) from Mauritius Coastal Waters, South-West Indian Ocean

et al. 2023

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Microalgae are unicellular organisms and commonly present in the euphotic zone of marine ecosystems. From the western coast of Mauritius, three strains of Prorocentrum species were isolated from macrophytes and cultured under standard laboratory conditions. Morphologies were examined by light, fluorescence, and scanning electron microscopy, and phylogenetic analyses were based on partial large subunit LSU rDNA (D1-D2) and ITS1-5.8S-ITS2 (ITS) regions. Three Prorocentrum species, including the P. fukuyoi complex, P. rhathymum, and P. lima complex, were identified. The antimicrobial activities were assayed against potential human pathogenic bacterial strains. The highest zone of inhibition was recorded for intracellular and extracellular protein extracts of Prorocentrum rhathymum against Vibrio parahaemolyticus. The polysaccharide extracts of the Prorocentrum fukuyoi complex had a higher zone of inhibition (24 ± 0.4 mm) against MRSA at a minimum concentration of 0.625 μg/mL. The extracts from the three Prorocentrum species had different levels of activity against the pathogens used, and this can be of scientific interest in the search for antibiotics from natural marine sources.

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Section: Discussionsupporting

confidence: 89%