Department Of Botany

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Subject: search.filters.subject.Macroalgae

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    Seaweed-associated epiphytic bacteria: Diversity, ecological and economic implications
    (Elsevier B.V., 2023-07-18T00:00:00) Kaur, Manpreet; Saini, Khem Chand; Mallick, Ashrumochan; Bast, Felix
    The microbial communities associated with seaweeds remain underexplored, despite their enormous biodiversity and the fact that they differ significantly from their free-living marinecounterpart. Studying the epiphytic bacterial microbiota, directly or indirectly, plays a vital role in normal algal morphological development, metabolism, growth and defence against fouling organisms. Furthermore, as these bacteria interact with algae in multifaceted ways, they constitute a fascinating source of new bioactive compounds with antimicrobials, antibiotic potential and produce algal-specific polysaccharidases with biotechnological applications. Microscopy, accompanied by bacterial culture and molecular biology, has made it feasible to establish and identify the phylogenetic origin of various algae-associated bacterial communities. Thus, this review first highlights the immense diversity of the epiphytic bacteria associated with algae, predominantly from the phyla Proteobacteria, Bacteroidetes, and Firmicutes. We further describe the factors affecting the composition and abundance of the epiphytic bacteria and their ecological role. We end with the bioprospecting value of this interaction, such as the production of hydrolytic enzymes and specific bioactive compounds. However, further investigation of the epiphytic bacterial communities present in different macroalgae using new technologies is still needed, mainly to evaluate the production of various metabolites with biotechnologicalapplications. � 2023 Elsevier B.V.
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    Seaweed-associated epiphytic bacteria: Diversity, ecological and economic implications
    (Elsevier B.V., 2023-07-18T00:00:00) Kaur, Manpreet; Saini, Khem Chand; Mallick, Ashrumochan; Bast, Felix
    The microbial communities associated with seaweeds remain underexplored, despite their enormous biodiversity and the fact that they differ significantly from their free-living marinecounterpart. Studying the epiphytic bacterial microbiota, directly or indirectly, plays a vital role in normal algal morphological development, metabolism, growth and defence against fouling organisms. Furthermore, as these bacteria interact with algae in multifaceted ways, they constitute a fascinating source of new bioactive compounds with antimicrobials, antibiotic potential and produce algal-specific polysaccharidases with biotechnological applications. Microscopy, accompanied by bacterial culture and molecular biology, has made it feasible to establish and identify the phylogenetic origin of various algae-associated bacterial communities. Thus, this review first highlights the immense diversity of the epiphytic bacteria associated with algae, predominantly from the phyla Proteobacteria, Bacteroidetes, and Firmicutes. We further describe the factors affecting the composition and abundance of the epiphytic bacteria and their ecological role. We end with the bioprospecting value of this interaction, such as the production of hydrolytic enzymes and specific bioactive compounds. However, further investigation of the epiphytic bacterial communities present in different macroalgae using new technologies is still needed, mainly to evaluate the production of various metabolites with biotechnologicalapplications. � 2023 Elsevier B.V.
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    Sequence-based phygeography and conservation of seaweeds from indian subcontinents
    (Central University of Punjab, 2014) Rani, Pooja; Bast, Felix
    Phylogeography is the study of historical events which are responsible for evolution and current distribution of a species in different geographical area. However very less record is available about marine macroalgae of Indian subcontinent. This study investigated the DNA barcoding and phylogeographical distribution of marine algae from the Indian subcontinent. Different algae samples collected from various coasts of Indian subcontinent are amplified using ITS, COX and rbcL primers. In our results, we found the occurrence of green algae like Ulva reticulata, Ulva intestinalis, Ulva fasciata, Ulva proliifera, Ulva ohnoi and one sample with Caulerpa scalpelliformis ; Red algae, Gracilaria foliifera, Gracilaria domingensis, Gracilaria corticata, Grateloupia Sp., Ceramium Sp., Centroceras clavulatum, Erythrocladia Sp., Erythrocladia irregularis, Acanthophora Sp., Dilsea socialis, Hypnea stelullifera, Sirodotia tenuissima and Dichotomaria Sp.; Brown algae, Sargassum zhangii, Sargassum megalocystum, Sargassum aquifolium and Turbinaria ornata in Indian subcontinent. Gracilaria domingenesis, Dilsea socialis, Sargassum megalosystum were first time reported in India. On the basis of molecular studies, we found that Ceramium Sp. Nov., Erythrocladia Sp. Nov., Acanthophora Sp Nov., Grateloupia Sp. Nov. and Dichotomaria Sp. Nov. were identified as new species. Erythrocladia irregularis was identified as endophytic algae inside green algae Cladophora glomerata. Phylogenetic tree was generated to analyse the evolutionary distance between different samples. Morphological and microscopic studies were performed for each sample. This study further helps in identification and documentation of new species and cryptic species. All samples were pressed for herbarium voucher.
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    Diversity of green and red macroalgee distributed in indian west-coast using morphometry and DNA barcoding
    (Central University of Punjab, 2013) Aijaz Ahmad John; Bast, Felix
    Modern algal systematists exploit genetic tools for molecular assisted alpha taxonomy and DNA barcoding is one such molecular tool that relies on the use of a standardized DNA region as a tag for rapid and accurate species identification. In this study Nuclear Internal Transcribed Spacer (ITS) was used as a marker for identification and phylogenetic analysis of marine green and red macroalgae in Indian subcontinent. Using Bayesian Inference for phylogenetic reconstruction with T3P model of molecular evolution and gamma distribution (T3P+G) using ITS dataset revealed that the bloom forming Ulva intestinalis found in west coast of Indian subcontinent showed strong endemism, supporting the view that that the genus Ulva encompasses a number of endemic cryptic species in addition to cosmopolitan species. Although there were two morphotypes present in Indian isolates, they constituted a single clade with robust Bayesian Posterior Probability support, confirming conspecificity of these morphotypes. Our results also indicate latitudinal gradients in the distribution of tubular Ulva, with a clade encompassing all nontropical isolates. Higher genetic heterogeneity of tropical isolates as evidenced by highest within-group T3P (Tamura-3-Parameter) distances comparing with that of non-tropical isolates is suggestive of tropics being the geographic origin of these species. While U. compressa and U. intestinalis were monophyletic within nontropical superclade, these morphotypes were polyphyletic within the tropical clade. Due to the polyphyly of currently accepted morphospecies concept and formation of distinct phylogenetic clade among Indian isolates forces us to propose a new bloom forming species of Ulva paschima. Further molecular assessment of invasive Carrageenophyte Kappaphycus alvarezii using ITS-1 region showed affinity to phylogenetic clade of mixed geographical origin confirming that the species was introduced in the subcontinent by human intervention. Surprising result of our study was an endophytic green algae Ulvella leptochaete that was found growing inside Caldophora glomerata, a first report of its kind from India.