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Marine macroalgae are foundation species that play a critical ecological role in coastal communities as primary producers. The macroalgal genus Ulva is vital in intertidal communities, serving as a food source and shelter for organisms, but these species also form environment-damaging nuisance blooms. This project aimed to demonstrate the utility o...
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Two green microalgal strains, CCCryo 469-16 and CCCryo 470-16, were isolated from samples of Antarctic microflora. Their morphology and 18S rRNA sequences indicated a phylogenetic relationship with strains of the genera Chlorococcum Meneghini, Macrochloris Korshikov, and Pleurastrum Chodat. The last genus is considered particularly problematic as i...
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Green algae, Ulva Linnaeus, 1753 (Ulvales, Chlorophyta), is found abundantly in intertidal regions of the coasts. Members of the genus exist in foliose, filamentous, and tubular forms and may be distromatic or monostromatic. This study investigates the phylogenetic distribution of foliose Ulva from various geographical locations in India. The morph...
Traditionally, the order Ulotrichales comprised green algae of an unbranched, uniseriate, filamentous morphology. However, since the establishment of ultrastructural features, the circumscription of this order has dramatically changed. Some genera and species have been excluded from this order and others with different morphologies (sarcinoid, bran...
The genus Ulva Linnaeus 1753 is well known for its global distribution and containing many taxonomically debated species. Their morphological plasticity and cryptic nature overrepresent and underrepresent, respectively, the biodiversity of these species. The difficulty in morphologically identifying Ulva species has led to the accumulation of many...
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... The lectotype of U. prolifera O. F. Müller is a drawing in Müller (Müller 1778), the epitype was designated and sequences for the ITS-2 and 5S rDNA spacer regions generated. The ITS-2 sequence of this specimen was not made publicly available but was reported to be identical to a previously published sequence with GenBank accession number AJ012276 (Kuba et al. 2022). ...
... Based on this synonymy, Kuba et al. (2022) identified U. procera specimens from San Juan Islands (USA) on the basis of ITS-2 sequences, that were 1-2 base pairs different (0.47-0.93 %) from that of the U. prolifera epitype. However, the San Juan Islands specimens molecularly identified as U. prolifera, were not branched tubes, the characteristic morphology of the species, but distromatic blades that became tubular where they were basally narrow near the point of attachment. ...
... However, the San Juan Islands specimens molecularly identified as U. prolifera, were not branched tubes, the characteristic morphology of the species, but distromatic blades that became tubular where they were basally narrow near the point of attachment. This latter morphology has been identified as U. linza in the Northeast Pacific (Kuba et al. 2022). In the light of these observations, the authors suggest that the concept of U. prolifera needs to be expanded to include blade-form thalli. ...
The genus Ulva Linnaeus 1753 is well known for its global distribution and containing many taxonomically debated species. Their morphological plasticity and cryptic nature overrepresent and underrepresent, respectively, the biodiversity of these species. The difficulty in morphologically identifying Ulva species has led to the accumulation of many species names that are currently considered synonyms. The correct identification of these species is crucial due to their significant role in marine ecosystems and mariculture. In the last 30 years, several checklists and taxonomic contributions have been made from the Italian coast on Ulva species, almost entirely based on morphological studies and only a few papers with molecular data have been published. In this study, samples deposited at the Institute of Marine Sciences (ISMAR) and Phycological Lab (PHL) herbaria have been reviewed by sequencing the chloroplast-encoded elongation factor Tu (tufA) barcode marker. The results obtained provide an update of the DNA barcode inventory of Ulva species for the Lagoon of Venice and the Strait of Messina, two ecosystems characterized by a high algal biogeographical diversity and continuous introduction due to anthropogenic activities. Here, ten Ulva species were identified based on molecular data. Furthermore, we record the presence of Ulva chaugulei on the coast of Tunisia.
... There are many kinds of seaweeds growing in the intertidal zone of the ocean, mainly including red algae, brown algae and green algae (Titlyanov et al. 2014; Douglas et al. 2015; Kuba et al. 2022). The intertidal zone is characterized by a very variable environment, which is largely determined by the tidal cycle (Zhao et al. 2022). ...
The salt-tolerant mutants HAGL-X5, HAGL-X3, and the control were subjected to transcriptome assays after three weeks of treatment with artificial seawater of different salinities (30‰, 45‰ and 60‰). A large number of differential genes were obtained in the transcriptome, and we performed weighted co-expression network analysis (WGCNA) of these differential genes. The results showed that the samples that correlated well with salinity traits were mainly Ctr-60, X3-60 and X5-60, while the samples that correlated well with strain traits were mainly X5-30, X5-45 and X5-60. Then the modules that correlated well with salinity traits were mainly blue, red and tan modules. The modules that correlated well with strain traits were black, cyan, lightcyan, and yellows modules. KEGG enrichment of genes from the above modules revealed that the most significant enrichment pathways associated with salinity traits were the proteasome and carbon fixation by photosynthesis. The most significant enrichment pathways associated with strain traits were lipid metabolism, oxidative phosphorylation, and porphyrin and chlorophyll metabolism. From the expression analysis, the gene expression on the proteasome pathway and the carbon fixation pathway of photosynthesis was higher in all strains at a salinity of 60‰ than in all strains at other salinities. Also the gene expression of X5-60 was higher than that of Ctr-60 and X3-60 on the proteasome pathway. The expression of X5-30 genes was lower than that of Ctr-30 and X3-30 in oxidative phosphorylation as well as porphyrin and chlorophyll metabolism in strain-related enrichment pathways, where the low expression of genes of porphyrin and chlorophyll in X5-30 may be related to the higher NPQ value of X5-30. Finally, correlation analysis identified candidate genes with well correlation with salinity in proteasome and carbon fixation by photosynthesis, and with strain traits in lipid metabolism, oxidative phosphorylation, and porphyrin and chlorophyll metabolism.
