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https://ptsldigital.ukm.my/jspui/handle/123456789/499778| Title: | A systematic study of Acanthoideae and Ruellioideae (Acanthaceae) in Yemen |
| Authors: | Al-Hakimi Anisah Saeed Mohammed Abdo (P52886) |
| Supervisor: | Abdul Latiff bin Mohamed, Emer. Prof. Dato Dr. |
| Keywords: | Acanthaceae-Yemen. |
| Issue Date: | Apr-2015 |
| Description: | A systematic study of Acanthoideae and Ruellioideae (Acanthaceae) of Yemen comprises which 18 genera and 47 species has been carried out. This study utilizes the morphological, anatomical, palynological and molecular characters to assess the variation within the tribes and genera. Morphologically, segments of calyx were found to be good character to distinguish Barlerieae and Acantheae that have 4 segments with outer and inner calyx and Ruellieae has 5 lobes united till the third base while Justicieae has 5 free lobes. Type and size of fruits, bracts, inflorescences, flowers, internodes, stamen number and shape confirmed the transfer of Peristrophe to Dicliptera. A new species Blepharis cayaniense Al-Hakimi is described and Dicliptera teklei is a new record to Yemen, which was formerly known from Ethiopia. Seed morphology and seed coat ornamentation provided a significant character to distinguish the tribes which vary from tuberculate in Justicieae, small hygroscopic hairs arranged on the margin or whole surface in Ruellieae and silky long hairs in Barlerieae and Neuracanthus, thick and scaly hairs in Acantheae. The anatomical study had shown that there were 6 types of stem outlines with 4-12 projections, 4 types of petiole outlines, 4 types of vascular bundles, 2 types of stomata and 4 types of anticlinal walls. Double cystoliths are shown as a special characters in Barlerieae and single cystoliths in Ruellieae while the cystoliths are absent in Acantheae. Hairs of different types such as unicellular, multicellular, armed or glandular were observed on the surface of stem, petiole and midrib which are useful to distinguish genera but the dense spiral hairs that cover the lamina and midrib are unique in Neuracanthus aculeatus and layers of hypodermis present in most of species which are endemic to Socotra Island. Pollen morphology has a taxonomic value provided by three shapes distinguished, ie. spheroidal, prolate and subprolate and different pollen class ie. porate, tricolporate, dicolporate to colpate. Circular aperture is present in Justicieae, Ruellieae, and Barlerieae except in Acantheae which are colpate. Measurements of lumina, mesocolpi, apocolpi, pseudocolpi, pores, columellae, granules and exine thickness are useful to distinguish species. The molecular evidences using two regions trnL-F and atpB were analysed using PAUP which produced four clades that coincide with Acantheae, Barlerieae, Ruellieae and Justicieae. The trnL-F and atpB regions separately, also produced four main clades, clade I consists of Acantheae, clade II Justicieae, clade III contains Barlerieae and clade IV Ruellieae and Neuracanthus aculeatus forms the base of Barlerieae and could be segregated as a separate subtribe.,Ph.D |
| Pages: | 294 |
| Call Number: | QK495.A1655 H337 2015 |
| Publisher: | UKM, Bangi |
| Appears in Collections: | Faculty of Science and Technology / Fakulti Sains dan Teknologi |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| ukmvital_82275+SOURCE1+SOURCE1.0.PDF Restricted Access | 22.3 MB | Adobe PDF |  View/Open |
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