دراسة تصنيفية وحياتية للفطريات الناقصة الملونة في البصرة == Taxonomical and Biological study of Dematiaceous imperfect - fungi in Basrah
Author name:
زينب خلف عبد الله
Supervisor name:
توفيق محمد محسن
General topic:
Biology
Specific topic:
Microbiology - Fungi
Degree:
Doctorate
University:
University Of Basrah - College Of Education For Pure Sciences
Language:
Arabic
University location:
Basrah
First pages:
24T3542 - p.pdf
Abstract:
During this study 23 species belong to 10 genera of imperfect fungi were isolated from different natural sources ( plants, soil , and ari) from Basrah govermanete using different isolation methods.Among the isolated fungi the genus Alternaria was selected to identify its species by using the morphological characteristis by light microscopy and Scaning Electron in Microscope (SEM) and verified by molecular and chemical methods. Eight species of Alternaria were identified namely; A.alternata (isolate1 and 2) A.chlamydospora A.citri, A.raphani , A.longipes , A.infectoria A.tenuissima and A.chrysanthemi based on light microscope examination.Taxonomic relegation of these species were confirmed by SEM image. SEM revealed that there was differences in the conidial wall ornamentation .The molecular analysis using PCR depending on the loci ITS1, and ITS4 700bp which confirmed the morphological identification of most of species namely A.alternata (isolate 1 and 2) , A.chlamydospora , A.longipes , A.infectroia and A.tenuissima. However , A.citri was related to A.alternata, A.raphani was belonged to A.infectoria and A.chrysanthemi is belonging to A.lolii. Nevertheless ,by using the loci OPA1 - 3 there was no variation among the species of Alternaria ,this is may be due to the inadequate method applied.The genetic variation of 36 isolates of A.alternata was studied using 9 - primers by RAPD - PCR technique. All primes gave an amplification of DNA for all the fungal isolates. Among the primers OPC08 exhibited a highest efficacy reaching 235 total bands .In the present study the antibacterial activity of fungal crude extract was tested. It appeared that the extract exhibit an antibacterial bioactivity against E.coli , S.aureus , S.epidermidis and S.saprophyticus.However, the extract of A.alternata (isolate 1 and 2) showed an inhibition growth against all the tested bacterial strains. This study was also revealed that the fungal filtrates of Alternaria species possessed various chemical compounds. However, there were differences in the chemical composition among the fungal filtrates.The results showed that Alternaria species ( A.alternata isolate 1 and 2, A.chlamydospora A.citri, A.raphani , A.longipes) were capable to biosynthesize silver nanoparticles, when the fungal filtrate were treated with AgNO3 solution after72 hrs incubation .Silver nanoparticles synthesis was checked by the change of colour from yellow to brown and confirmed by Uv - vis spectrophotometry at wave length (420, 440 nm). SEM image showed that the silver nanoparticles with spherical shape and size ranged between (20 - 72nm). Aconclusion can be derived that application of SEM,chemical analysis of fungi extracts ,molecular analysis and the silver nanoparticles characteristics are useful in the taxonomy of fungi to solve the overlapping of the morphological identification .Taxonomic key were prposed for the species of the genes Alternaria based on the morphology , chemical compound with the fungal extracts and size of silver nanoparticles synthesized by fungi .Melanin pigment identify by TEM microscope and it appeare like dark drop inside the cell .
