دراسة تصنيفية لبعض اجناس العائلة المركبة Asteraceae في العراق == Taxonomical Study of Some Genera From Asteraceae In Iraq
Author name:
اشواق فالح خزعل العجيلي
Supervisor name:
عبد الكريم خضير البيرماني
General topic:
Biology
Specific topic:
Plant
Degree:
Master
University:
University of Babylon - College Of Education For Pure Sciences - Department Of Biology
Language:
Arabic
University location:
Babylon
First pages:
24T2991 - p.pdf
Abstract:
تناول هذا البحث دراسة تصنيفية مقارنة لستة اجناس تعود للعائلة المركبة Asteraceae وهي Chrysanthemum L. وGazinia وGerbera وLeontodon L. وTagetes L. وZinnia L. وتميز كل جنس من تلك الاجناس المذكورة باحتوائه على نوع واحد فقط في العراق وهيL. Chrysanthemum coro | The present investigation comprises systematic study for six genera belong to Asteraceae as follow : Chrysanthemum L., Gazinia, Gerbera, Leontodon L., Tagetes L. and Zinnia L. Each genus of those genera described as containing only one species in Iraq, Chrysanthemum coronarium L., Gazinia splendens Gaertn, Gerbera jamisoni F.Gmel, Leontodon laciniatus L., Tagetes patula L. and Zinnia elegans L. respectively. The study was conducted in the laboratory research of plant taxonomy / College of Science women / Babylon university for the period January 2015 until August 2015.The study included morphological, anatomical, palynological and chemical characteristics as well as numerical taxonomy have been done for all species. The importance of taxonomic to studying variations in roots, stems, leaves, inflorescences, involucre bracts, flowering and fruiting parts and Indumentum were discussed. Results showed that many of the vegetative and reproductive characters have the importance taxonomic value for isolating genus from each other such as presence and absence of the stem and the nature of the basal and cauline leaves in addition the present of leafy stipule as well as the nature of Indumentum.Anatomical characters of leaves epidermises and the cross section of the stem, leaf blade, petiole and peduncles, in addition leaves venation have been studied and their taxonomic importance were assessed.The study also found the pollen grain was tricolporate in general, but the presence of spine or not had an important taxonomic to isolate Gerbera jamisoni by smooth surface compared to the rest of the species, while possible to isolate Gazinia splendens and Leontodon laciniatus by the presence of the bridges in pollen surface. On the other hand it has been the study of chemical content in each of the leaves and flowering heads of the species studied using Gas Chromatography technique (GC) to detect the terpenoid compounds, The presence of compound Nerolidol, Terpinolene in the species.. Gerbera jamisoni, Zinnia elegans emphasized the importance taxonomic chemical content at the level of species and genera.The species were numerically treated on the basis of number of selected characteristic from various studies to obtain the similarity and differences ranges between different species. Dendrogram was drawn for this purpose. As a result of preceding observation this study confirmed the diagnosis of six genera within Asteraceae family in Iraq. Finally all the taxa were treated taxonomically, and the key was prepared for all the taxa studied.
