Sains Malaysiana 41(1)(2012): 53–62

Ciri Anatomi Stip Bagi Beberapa Spesies Davallia (Davalliaceae) di Malaysia

(Stipe Anatomical Characteristics in Some Davallia (Davalliaceae) Species in Malaysia)

T. Noraini, A.R. Ruzi., N. Nadiah, R.N. Nisa, H. Maideen & S.N. Solihani

School of Environmental and Natural Resource Sciences, Faculty of Science and Technology

Universiti Kebangsaan Malaysia, 43600 UKM, Bangi Selangor, Malaysia

Received: 2 March 2011/ Accepted: 29 June 2011

ABSTRAK

Kajian anatomi stip telah dijalankan ke atas tujuh spesies Davallia, iaitu D. denticulata, D. divaricata, D. trichomanioides var. trichomanioides, D. trichomanioides var. lorrainii, D. corniculata, D. repens dan D. solida var. solida di Malaysia. Kajian ini melibatkan keratan rentas bahagian stip menggunakan mikrotom gelongsor. Hasil kajian menunjukkan ciri anatomi stip seperti bentuk luaran stip, corak kehadiran sel sklerenkima di bawah epidermis, jenis dan bentuk stel, bilangan berkas vaskular, bilangan lapisan sel parenkima dan juga kehadiran cuping pada keratan rentas stip boleh digunakan untuk pengecaman dan pembezaan spesies. Ciri sepunya bagi genus Davallia ialah kehadiran sel sklerenkima mengelilingi stel dan di bawah lapisan sel epidermis, serta kehadiran sel parenkima berdinding tebal. Banyak ciri diagnostik ditemui dalam kajian ini dan antaranya ialah kehadiran satu cuping pada keratan stip tengah ditemui hanya pada D. trichomanioides var. lorrainii, corak 4 kehadiran sel sklerenkima di bawah epidermis ditemui hanya pada D. repens, corak 3 hanya ditemui pada D. solida var. solida, corak 5 dan 7 hanya ditemui pada D. corniculata, stel jenis dorsiventral protostel bagi D. divaricata dan bagi D. trichomanioides var. trichomanioides pula, kehadiran stel bentuk arka pada stip atas, stip tengah dan juga bawah merupakan ciri diagnostik yang baik untuk pengecaman spesies ini. Hasil kajian ini menunjukkan bahawa ciri anatomi stip mempunyai nilai taksonomi dalam genus Davallia dan boleh digunakan sebagai data sokongan untuk tujuan pengecaman dan pembezaan spesies.

Kata kunci: Ciri anatomi; Davallia; stip

ABSTACT

A study on the stipe anatomy was undertaken on seven species of Davallia namely D. denticulata, D. divaricata, D. trichomanioides var. trichomanioides, D. trichomanioides var. lorrainii, D. corniculata, D. repens and D. solida var. solida to investigate variation in stipe anatomical characteristics. Method used in this study was cross sectioned using sliding microtome. Our results showed that stip anatomical characteristics such as stipe outline, patterns of schlerenchyma cells under epidermal layers, stele types and shapes, number of vascular bundles, number of parenchyma cell layers and in the presence of wings on the adaxial side of stipe, could be used in differentiation and identification of species. Common characters in all species studied were the presence of schlerenchyma cells below the epidermal layers and also ensheathed the steles, and the presence of parenchyma cells with thick wall. Diagnostic characteristics found in this study were a single wing found on the adaxial side of middle stipe in D. trichomanioides var. lorrainii, patterns of schlerenchyma cell layers underneath epidermal cells; pattern 4 in D. repens, pattern 3 in D. solida var. solida, pattern 5 and 7 in D. corniculata, dorsiventral protostele only found in D. divaricata, and arch-shaped of vascular bundles in the upper, lower and middle stipe only found in D. trichomanioides var. trichomanioides. Our results showed that stipe anatomical characteristics have taxonomic value in Davallia and can be used as additional data for species differentiation and species identification.

Keywords: Anatomical characteristics; Davallia; stipe

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*Corresponding author; email: norainitalip@gmail.com, ntalip@ukm.my