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Taxonomic study of Chroocophyceae (Cyanophyta) from northern areas of Pakistan

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Abstract

Forty-six species of planktonic, edaphic, epipsammic, epioikotic, epilithic and epiphytic blue- green algae belonging to the class Chroocophyceae have been collected from various freshwater habitats in the Districts of Attock, Gujranwala, Jhang, Jhelum, Khushab, Lahore, Sargodha, Sheikhupura and Sialkot of the province of the Punjab, from Bahrain and Kalam (Swat) in the province of N.W.F.P. as well as from Chenari, Muzaffarabad and Neelum Valley in Azad Kashmir during different seasons from March 1996 to August 2000. They were taxonomically investigated and found to belong to two orders, three families and eleven genera. Johannesbaptistia and Stichosiphon were represented by a single species, Aphanothece, Gleothece and Synechocystis by two, Synechococcus by three, Aphanocapsa by four, Microcystis by six and Chroococcus and Merismopedia by eight species. Gloeocapsa exhibited the largest diversity with ten species.

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... A few studies of this genus have been made from Pakistan, from taxonomic point of view (Farzana & Nizamuddin, 1979; Masud-ul-Hasan, 1980; Masud-ul-Hasan & Yunus, 1987) as well as from the viewpoint of its occurrence (Shameel & Butt, 1984; Jahangir et al., 2000, Leghari et al., 2000; Mahar et al., 2000), but no detailed taxonomic investigation was made so far. A huge collection of blue-green algae was made from various districts of the Punjab, certain areas of NWFP and Azad Kashmir (Naz et al., 2003) and detailed taxonomic study was carried out (Naz et al., 2004). ...
... Collections were made from various freshwater habitats of the districts of Gujranwala, Jauharabad, Khushab, Lahore, Sheikhupura, Sialkot in the province of the Punjab and from Kalam (Swat) in the province of NWFP during 1996-2000. The methods used for the collection and studies of the materials were the same as described previously (Naz et al., 2004). The specimens were taxonomically determined with the help of standard literature (Rabenhorst, 1932; Desikachary, 1959; Watanabe, 1971). ...
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Specimens of the blue-green alga, Anabaina Bory de Saint-Vincent (=Anabaena Bory) have been collected from various freshwater habitats in the districts of Gujranwala, Jauharabad, Khushab, Lahore, Sheikhupura, Sialkot from the province of the Punjab and from Kalam (Swat) in the province of NWFP at different seasons of the year. They were taxonomically investigated and found to belong to 16 species.
... In Pakistan, algal research is in the exploratory phase and therefore lacks any comprehensive and polyphasic studies. Several checklists have been published, in recent years [21][22][23][24][25][26][27][28][29][30][31]. However, there was hardly any focus on the cyanobacterial diversity of the arid environment. ...
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From the oasis of Cholistan, true branching heterocystous cyanobacterial strains were studied for, the cell arrangement in primary branches being mono‐ or bi‐seriate; shape of cells in main filament large and irregular; profused secondary branching emerging on one or both sides and tapering along their length. In these observed traits, two clear morphological taxa were recognized, both well assorted from the previously described species of the genus Westiellopsis. Both strains showed culturing response and studied for antibacterial, cytotoxic and anticancer potentials. The strain derived from the site B‐10 provenance exhibited antibacterial activity against Pseudomonas (18 mm); Klebsiella (15 mm), Staphylococcus (22 mm). On the contrary, the strain of site A‐44 showed no activity against any of the above‐mentioned bacterial strains. The cytotoxicity assay for the strain of B‐10 site showed a 36% larval mortality, whereas the strain A‐44 showed 24% larval mortality. Performance of the strain B‐10 in MTT assay (assessed on HCT‐116 cell lines) revealed a dose‐dependent activity: @200 µg/ml, 100 µg/ml, 50 µg/ml and 25 µg/ml; achieving a growth inhibition of 50.15%, 40.22%, 33.72% and 10.21%, respectively; and the strain of A‐44 could only exhibit a 30.06% growth inhibition @200 µg/ml. The 16S rDNA sequencing revealed the sequence homology with Neowestiellopsis. Based on data presented here we report two diverse taxa of true branching Nostocales from Cholistan oasis, Pakistan. This article is protected by copyright. All rights reserved.
... The present study described algae from rocks of Batkhela, District Malakand. Some previous workers also reported algae from rocks (Anjum et al., 1985; Anjum & Faridi, 1985; Hussain et al., 2003; Naz et al., 2004; Zarina et al., 2009; Ali et al., 2010). Recently Hussain et al., (2009 Hussain et al., ( , 2010) reported some algae from soil of KPK, Pakistan. ...
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The present study describes a total of 63 lithophytic algal species belonging to Cyanophyta (11 genera, 30 species), Chlorophyta (3 genera, 7 species) and Bacillariophyta (16 genera, 26 species) from rocks of Batkhela, District Malakand. The collected specimens were identified and described. This is the first ever report on rock algae from this area.
... Les cellules sont carrées à cylindriques ; le diamètre est de 5µm et leur longueur de 5-6 µm. Nos échantillons sont identiques à ceux de Naz et al. (2004), de Couté (1979) et de Compère (1974). Oscillatoria limosa C. Agardh ex Gomont (Figure 23) Le trichome ne présente pas de rétrécissement au niveau des articulations. ...
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La présente étude a été initiée dans le but de déterminer la composition taxonomique et la structure des peuplements de Cyanophyceae au niveau de l’ile de Ngor. Durant les travaux, une description basée sur des caractères morphologiques du thalle (cellule, colonie ou filament) des taxa a été effectuée. Aussi une classification et un inventaire systématique de ces taxa ont été réalisés. Six prélèvements ont été effectués entre juillet 2009 et août 2010 dans les eaux marines de l’île de Ngor située à 800 m de la côte dakaroise (Sénégal). L’observation des différents échantillons prélevés a permis de répertorier au niveau de cet écosystème 38 taxa de Cyanophyceae dont 28 identifiées jusqu’au niveau spécifique, réparties en 18 genres et 11 familles. Sur ces 11 familles, seules trois d’entre elles regroupent plus de la moitié des taxa présents. Ce sont les Oscillatoriaceae avec 31,56%, les Phormidiaceae et les Pseudanabaenaceae avec chacune 15,79%. Les Merismopediaceae représentent 10,53% des taxa, les Chroococcaceae 7,89%, et les Synechococcaceae 5,26%. Les familles des Borziaceae, des Xenococcaceae, des Hyellaceae, des Microcystaceae et des Rivulariaceae ne représentent chacune que 2,63%. Pour ce qui est des genres, Oscillatoria Vaucher est le plus représenté avec 7 taxa, suivi des genres Lyngbya C. Agardh et Phormidium Kütz. Ex Gom. avec chacun 4 taxa. Sur les 28 taxa identifiés jusqu’au niveau espèce, 17 ont été décrits pour la 1ere fois au Sénégal.Mots-clés : Cyanophyceae, composition taxonomique, structure, île de Ngor, Sénégal
... Mats collected were treated by filtration, centrifugation, and dilution techniques according to standard microbiological protocols (Stanier et al. 1971;Rippka et al. 1979). A purified strain was identified morphologically according to the keys and description established by Naz et al. (2004) as G. gelatinosa (Kützing, 1843). This cyanobacterium was initially subjected to different media and to different temperature and light intensity conditions to define the optimal growth conditions. ...
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The combined effect of temperature, light intensity, and NaNO3 concentration on lipid biosynthesis and fatty acid composition was investigated for the thermophilic cyanobacterium Gloeocapsa gelatinosa (Kützing 1843) isolated from a thermal spring in Tunisia. Under optimal growth conditions, the lipid content was 7.3 % DW. Fatty acid analysis revealed the predominance of 16:0 and 18:0 (23.7 and 18.2 %, respectively) as main straight carbon chains of saturated fatty acids. Unsaturated fatty acids were also identified with 18:1n9c (18.8 %) and 16:1n7 (5 %) being the predominant components. The effect of environmental factors on fatty acid composition was monitored by using principal component analysis and central composite design. Variation of light intensity (20 to 150 μmol photons m−2 s−1), temperature (20 to 60 °C), and nitrogen concentration (0 to 3 g L−1) induced a significant variation in the amount of fatty acid proportions, whereas lipid content was only slightly modified. Results showed that light intensity had the strongest effect on the composition of fatty acids. Temperature had a synergic effect with light intensity while nitrogen concentration had a trivial effect. The combined effect of high light intensity (150 μmol photons m−2 s−1) and high temperature (60 °C) increased the proportion of saturated 16:0 and 18:0 fatty acids along with long-chain fatty acids to 82 % which was twofold higher than that in optimal growth conditions. This induced fatty acid profile makes G. gelatinosa-based biofuels adaptable for higher energetic efficiency and higher oxidative stability.
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