Malaysian Applied Biology Journal

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47_05_36

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Malays. Appl. Biol. (2018) 47(5): 289–293

 

PRELIMINARY ANATOMICAL STUDY ON LEAF SURFACES OF

BORNEAN ZINGIBERACEAE (TRIBE ALPINIEAE) FROM

NORTH EAST SARAWAK


SALASIAH, M.* and MEEKIONG, K.


Faculty of Resource Science and Technology, Universiti Malaysia Sarawak,

94300 Kota Samarahan, Sarawak, Malaysia

*E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it


Accepted 2 October 2018, Published online 30 November 2018


ABSTRACT

Among the family Zingiberaceae, the biggest subfamily in Borneo is Alpinioideae. The highest diversity is recorded for tribe Alpinieae, with nine genera from Borneo. Tribe Alpinieae is, in fact, the most challenging that need further analysis for recircumscription of many of the genera. The study reported in this paper was carried out to investigate if the anatomy of leaf surfaces particularly epidermal cells, stomata, and trichomes are applicable as supportive data in finding the intergeneric variations within the tribe Alpinieae. The leaf surfaces of selected species from six genera of tribe Alpinieae (viz. Alpinia, Amomum, Elettaria, Etlingera, Geocharis, and Plagiostachys) from the north east of Sarawak was preliminarily studied. The epidermal cells of the adaxial surface are hexagonal or more or less polygonal in shapes in all selected species with straight anticlinal walls at both surfaces. The cells of the abaxial epidermis are much more variable and irregular in shapes and sizes. Different sizes of epidermal cells are also shown in all species. In addition, crystals are observed in epidermal cells of E. longipilosa only. Meanwhile, the type of stomata observed is of tetracytic form in all species. All species except for Alpinia aquatica possessed simple and unicellular trichomes. Study on leaf surface anatomy alone may only provide a baseline data to facilitate in taxonomical classification and a thorough leaf anatomical study on the lamina, leaf margin, midrib and petiole involving more species in each genus would provide more insightful information.

Key words: Alpinieae, Zingiberaceae, leaf anatomy, leaf surface, Borneo

 

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