Floral Trichomes Micromorphology of Selected Hoya R.Br. Species (Apocynaceae) in Peninsular Malaysia

Syazwani Basir; Ruzi Abdul Rahman; Ahmad Zaki Zaini; Ahmad Fitri  Zohari; Noraini  Talip; Hamidun Bunawan

doi:10.55230/mabjournal.v55i1.3601

Authors

Syazwani Basir
syazwanibasir@gmail.com
Department of Biological Science and Biotechnology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia https://orcid.org/0000-0002-1203-537X
Ruzi Abdul Rahman Taman Botani Bangi, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia
Ahmad Zaki Zaini Electron Microscopy Unit, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia
Ahmad Fitri Zohari Department of Biological Science and Biotechnology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia
Noraini Talip Department of Biological Science and Biotechnology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia
Hamidun Bunawan Institute of Systems Biology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia

Keywords:

Hoya, micromorphology, trichomes

Abstract

Trichomes, which are specialised structures found in the epidermis, are essential for the protection of plants and the secretion of secondary metabolites. This study examines the structures and density of trichomes on the flowers of five selected Hoya species: Hoya callistophylla T.Green., Hoya caudata Hook.f., Hoya elmeri Merr., Hoya maingayi Hook.f. and Hoya parviflora Wight. Through the application of light microscopy (LM) and scanning electron microscopy (SEM), we identified the types, morphology and localisation of trichomes in relation to floral glands. The findings indicated the existence of glandular trichomes, simple trichomes and papillae exhibiting various shapes, including conical, filamentous, finger-like, falcate and stalked capitate apical prostrusion located on the adaxial epidermis of corolla petals and pedicels. This investigation deepens the comprehension of Hoya's floral structure and adds to the taxonomic and ecological insights regarding the genus in Peninsular Malaysia.

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