Systematic Study of Genus Nepenthes L. (Nepenthaceae) in Western Sarawak, Borneo

Nepenthes is the sole genus of the monotypic family known as Nepenthaceae, under the order of Caryophyllales. This genus is native to Southeast Asia with Borneo and Sumatra being the centre of its diversity. Nepenthes are known as highly studied carnivorous plants for their unique morphological char...

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Main Author: NURUL NABILAH HUDA, MOHD HISHAM
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institution Universiti Malaysia Sarawak
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topic QK Botany
spellingShingle QK Botany
NURUL NABILAH HUDA, MOHD HISHAM
Systematic Study of Genus Nepenthes L. (Nepenthaceae) in Western Sarawak, Borneo
description Nepenthes is the sole genus of the monotypic family known as Nepenthaceae, under the order of Caryophyllales. This genus is native to Southeast Asia with Borneo and Sumatra being the centre of its diversity. Nepenthes are known as highly studied carnivorous plants for their unique morphological characteristics, ecology, carnivorous syndrome, ethnobotanical, phytochemical, and pharmacological properties. Hence, this study focused on revising and comparing the morphological characteristics of Nepenthes that are distributed particularly in western Sarawak as well as identifying the anatomical, micromorphological, and palynological characteristics of the Nepenthes studied. Distribution and ecology of each Nepenthes taxa were also studied. A total of eighteen taxa were recorded from western Sarawak (Samarahan, Kuching, Serian, and Samarahan). Most of the taxa were examined based on fresh samples collected from the field; Nepenthes albomarginata, N. ampullaria, N. gracilis, N. hirsuta, N. hispida, N. mirabilis, N. mirabilis var. echinostoma, N. nazreeana sp. nov. ined., N. rafflesiana and others. The remaining five taxa; N. bicalcarata, N. northiana, N. veitchii, N. tentaculata, and N. x bauensis were examined based on herbarium specimens deposited in SAR. The morphological examination revealed that the Nepenthes studied has interspecific and intraspecific variation among the taxa. The anatomical studies of 13 collected Nepenthes taxa under the light microscope were focused on two parts; the epidermal layers, and the midrib. The stomatal complex type of Nepenthes studied are all anomocytic either with straight, or sinuous type of anticlinal walls on their abaxial or adaxial surfaces. Additional data from Field Scanning Electron Microscopy revealed that the stomata have three types of formation; sunken, raised, and semi-raised. They are developed in various sizes and densities among the polygonal epidermal cells. The sessile glands also were noticed to appear mostly on the adaxial surfaces of leaves. Meanwhile, the midrib cross section shows four types of outer shapes with different vascular bundle arrangements and have a complex closed vascular system with consistent closed, collateral vascular bundles. The micromorphological characteristics were observed mainly on the epidermal layers of the leaves, and the pitchers of Nepenthes under FESEM. Trichomes were present mostly on the abaxial surfaces of the leaves compared to the adaxial surfaces. More than five types of trichomes were identified and all of them were categorised into two which are glandular trichomes and non-glandular trichomes. The examination of the inner surface of the pitcher depicted a variety of features such as the lunate cells and the digestive glands. The lunate cells were found distributed abundantly on the upper part of the pitcher body which is known as the waxy zone. Ten taxa from the 13 Nepenthes studied own these features that are formed in a crescent-like shape which bends downwards and elongate horizontally in various lengths. Meanwhile, the digestive glands were observed present on the inner surface of the pitcher of all 13 Nepenthes studied. Most of them are developed in the basal half of the pitcher, known as the digestive zone. The digestive glands are conspicuously different in sizes and density among the 13 taxa studied. The palynological study focused on six Nepenthes taxa; N. ampullaria, N. gracilis, N. mirabilis, N. nazreeana sp. nov. ined., N. rafflesiana, and N. reinwardtiana are tetrahedral tetrad and inarpeturate with echinate-microechinate ornamentation. The sizes of the pollen tetrads of the six Nepenthes studied are slightly varied between 17.02-19.91 µm in diameter, and all of them were identified as small size which falls between 10-25 µm. The pollen characteristics are homogenous among the six Nepenthes taxa studied. Therefore, they are not possessing any taxonomic value that can help in delimiting the taxa in the genus. But, they can be differentiated by their sizes, which can be influenced by the environment or the methods used to observe the pollen.
format Thesis
qualification_level Master's degree
author NURUL NABILAH HUDA, MOHD HISHAM
author_facet NURUL NABILAH HUDA, MOHD HISHAM
author_sort NURUL NABILAH HUDA, MOHD HISHAM
title Systematic Study of Genus Nepenthes L. (Nepenthaceae) in Western Sarawak, Borneo
title_short Systematic Study of Genus Nepenthes L. (Nepenthaceae) in Western Sarawak, Borneo
title_full Systematic Study of Genus Nepenthes L. (Nepenthaceae) in Western Sarawak, Borneo
title_fullStr Systematic Study of Genus Nepenthes L. (Nepenthaceae) in Western Sarawak, Borneo
title_full_unstemmed Systematic Study of Genus Nepenthes L. (Nepenthaceae) in Western Sarawak, Borneo
title_sort systematic study of genus nepenthes l. (nepenthaceae) in western sarawak, borneo
granting_institution Universiti Malaysia Sarawak
granting_department Faculty of Resource Science and Technology
publishDate 2024
url http://ir.unimas.my/id/eprint/44430/3/MSc_NURUL%20NABILAH%20HUDA%20MOHD%20HISHAM%20-%2024%20pages.pdf
http://ir.unimas.my/id/eprint/44430/4/MSc_NURUL%20NABILAH%20HUDA.dsva.pdf
http://ir.unimas.my/id/eprint/44430/5/MSc_NURUL%20NABILAH%20HUDA.fulltext.pdf
_version_ 1794023050551754752
spelling my-unimas-ir.444302024-03-12T07:28:27Z Systematic Study of Genus Nepenthes L. (Nepenthaceae) in Western Sarawak, Borneo 2024-03-06 NURUL NABILAH HUDA, MOHD HISHAM QK Botany Nepenthes is the sole genus of the monotypic family known as Nepenthaceae, under the order of Caryophyllales. This genus is native to Southeast Asia with Borneo and Sumatra being the centre of its diversity. Nepenthes are known as highly studied carnivorous plants for their unique morphological characteristics, ecology, carnivorous syndrome, ethnobotanical, phytochemical, and pharmacological properties. Hence, this study focused on revising and comparing the morphological characteristics of Nepenthes that are distributed particularly in western Sarawak as well as identifying the anatomical, micromorphological, and palynological characteristics of the Nepenthes studied. Distribution and ecology of each Nepenthes taxa were also studied. A total of eighteen taxa were recorded from western Sarawak (Samarahan, Kuching, Serian, and Samarahan). Most of the taxa were examined based on fresh samples collected from the field; Nepenthes albomarginata, N. ampullaria, N. gracilis, N. hirsuta, N. hispida, N. mirabilis, N. mirabilis var. echinostoma, N. nazreeana sp. nov. ined., N. rafflesiana and others. The remaining five taxa; N. bicalcarata, N. northiana, N. veitchii, N. tentaculata, and N. x bauensis were examined based on herbarium specimens deposited in SAR. The morphological examination revealed that the Nepenthes studied has interspecific and intraspecific variation among the taxa. The anatomical studies of 13 collected Nepenthes taxa under the light microscope were focused on two parts; the epidermal layers, and the midrib. The stomatal complex type of Nepenthes studied are all anomocytic either with straight, or sinuous type of anticlinal walls on their abaxial or adaxial surfaces. Additional data from Field Scanning Electron Microscopy revealed that the stomata have three types of formation; sunken, raised, and semi-raised. They are developed in various sizes and densities among the polygonal epidermal cells. The sessile glands also were noticed to appear mostly on the adaxial surfaces of leaves. Meanwhile, the midrib cross section shows four types of outer shapes with different vascular bundle arrangements and have a complex closed vascular system with consistent closed, collateral vascular bundles. The micromorphological characteristics were observed mainly on the epidermal layers of the leaves, and the pitchers of Nepenthes under FESEM. Trichomes were present mostly on the abaxial surfaces of the leaves compared to the adaxial surfaces. More than five types of trichomes were identified and all of them were categorised into two which are glandular trichomes and non-glandular trichomes. The examination of the inner surface of the pitcher depicted a variety of features such as the lunate cells and the digestive glands. The lunate cells were found distributed abundantly on the upper part of the pitcher body which is known as the waxy zone. Ten taxa from the 13 Nepenthes studied own these features that are formed in a crescent-like shape which bends downwards and elongate horizontally in various lengths. Meanwhile, the digestive glands were observed present on the inner surface of the pitcher of all 13 Nepenthes studied. Most of them are developed in the basal half of the pitcher, known as the digestive zone. The digestive glands are conspicuously different in sizes and density among the 13 taxa studied. The palynological study focused on six Nepenthes taxa; N. ampullaria, N. gracilis, N. mirabilis, N. nazreeana sp. nov. ined., N. rafflesiana, and N. reinwardtiana are tetrahedral tetrad and inarpeturate with echinate-microechinate ornamentation. The sizes of the pollen tetrads of the six Nepenthes studied are slightly varied between 17.02-19.91 µm in diameter, and all of them were identified as small size which falls between 10-25 µm. The pollen characteristics are homogenous among the six Nepenthes taxa studied. Therefore, they are not possessing any taxonomic value that can help in delimiting the taxa in the genus. But, they can be differentiated by their sizes, which can be influenced by the environment or the methods used to observe the pollen. Universiti Malaysia Sarawak 2024-03 Thesis http://ir.unimas.my/id/eprint/44430/ http://ir.unimas.my/id/eprint/44430/3/MSc_NURUL%20NABILAH%20HUDA%20MOHD%20HISHAM%20-%2024%20pages.pdf text en public http://ir.unimas.my/id/eprint/44430/4/MSc_NURUL%20NABILAH%20HUDA.dsva.pdf text en staffonly http://ir.unimas.my/id/eprint/44430/5/MSc_NURUL%20NABILAH%20HUDA.fulltext.pdf text en validuser masters Universiti Malaysia Sarawak Faculty of Resource Science and Technology UNIMAS Graduate Zamalah Scholarship Adam, J. H. (1997). Prey Spectra of Bornean Nepenthes (Nepenthaceae) species in relation to their habitat. Pertanika Journal of Tropical Agricultural Science, 20(2/3), 121-134. Adam, J. H., & Wilcock, C. C. (1999). Palynological study of Bornean Nepenthes (Nepenthaceae). Pertanika Journal of Tropical Agricultural Science, 22(1), 1-7. Adam, J., Wilcock, C. C., & Swaine, M. D. (1991). The ecology and distribution of Bornean Nepenthes. Journal of Tropical Science, 5(1), 13-25. Al Farishy, D. D., Nisyawati, & Metusala, D. (2017). Characterization anatomical leaf blade of five species Nepenthes from Kerinci Seblat National Park, Kerinci Regency, Jambi province. AIP Conference Proceedings, 1862(1), 030115. https://doi.org/10.1063/1.4991219 Bauer, U., & Federle W. (2009). The insect-trapping rim of Nepenthes pitchers: Surface structure and function. Plant Signal & Behavior, 4(11), 1019-1023. Biati, N. Y. K. (2012). Studi Anatomi dan Struktur Sekretori Tanaman Kantong Semar (Nepenthes spp.). M. Sc. thesis, Bogor Agricultural University, Bogor. Bittrich, V. (1993). Introduction to Cemtrospermae. In Flowering Plants: Dicotyledons (pp. 13-19). Berlin, Heidelberg: Springer. doi:0.1007/978-3-662-02899-5_2 Burbidge, F. W. (1880). Nepenthes bicalcarata. The Gardeners' Chronicle, 13, 264-265. Cerceau-Larrival, M. (1971). Morphologie pollinique et correlations phylogenetiques chez les Ombelliferae. In V. H. Heywood (Ed.), The Biology and Chemistry of the Umbelliferae (pp. 109-156). 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