Malays. Appl. Biol. (2007) 36(2): 47–55
SYSTEMATIC SIGNIFICANCE OF PETIOLE AND MIDRIB ANATOMICAL CHARACTERS IN PARASHOREA (DIPTEROCARPACEAE) OF MALAYSIA
NORAINI TALIP1* and DAVID CUTLER2
1 School of Environmental and Natural Resource Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia
2Jodrell Laboratory, Royal Botanic Garderns, Kew, Richmond Surrey TW9 AB, United Kingdom
*E-mail:
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ABSTRACT
The petiole and midrib anatomy of genus Parashorea from Malaysia were investigated. In this study eight species representative of genus Parashorea were selected. Results from this study showed that the midrib outline can be used as a diagnostic character for P. tomentella. The presence of glandular and simple unicelullar hairs is proved to be characteristic for Parashorea species. The presence of resin canals adjacent to central vascular bundles in the petioles and midribs can be used to distinguish species such as P. densiflora and P. smythiesii. Results from this study have also shown that the number of resin canals adjacent to the adaxial side of the peripheral vascular bundles in the petiole and midrib and those related to the central vascular bundles in the petiole and midrib has taxonomic value for each species of this genus.
ABSTRAK
Kajian anatomi petiol dan tulang daun telah dijalankan ke atas genus Parashorea di Malaysia. Dalam kajian ini lapan spesies yang mewakili genus Parashorea telah dipilih. Hasil kajian menunjukkan bentuk garis luar tulang daun boleh digunakan sebagai ciri diagnosis P. tomentella. Kehadiran trikom ringkas unisel dan trikom berkelenjar adalah ciri untuk spesies dalam genus Parashorea. Kehadiran saluran rembes pada bahagian berkas vaskular petiol dan tulang daun boleh digunakan untuk membezakan antara spesies tertentu seperti P. densiflora dan P. smythiesii. Hasil kajian juga menunjukkan bilangan saluran rembes yang hadir pada bahagian adaksial berkas vaskular luar dan berkas vaskular tengah petiol dan tulang daun mempunyai nilai taksonomi bagi setiap spesies yang dikaji dalam genus ini.
Keywords: Dipterocarpaceae, Parashorea, anatomy, micromorphology
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