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Systematics of peninsular Malaysian scaly tree ferns (Cyatheaceae): phylogenetics, computer-aided identification and conservation

Azi Azeyanty Jamaludin

Abstract

The work presented in this thesis evaluates the status of Peninsular Malaysian Cyatheaceae and used molecular and morphological identification tools for the local species. 419 Cyatheaceae frond sample were collected from the widest possible range of Peninsular Malaysia to obtain material for morphology and molecular study. 15 Cyathea species were identified and the species information for Peninsular Malaysia was updated. The species was incorporated into the existing Cyatheaceae phylogeny by using four plastid regions: matK, rbcL, trnG-trnR and trnL-trnF. Bayesian MCMC analysis of the concatenated sequence data resulted in a 50% majority rule consensus tree confirm the placement of the four groups: Cyathea, Alsophila, Gymnosphaera and Sphaeropteris in the family. However, the resulting tree representing nested monophyletic groups, proposing Cyatheaceae to be monogeneric, i.e., Cyathea with two large groups: Cyathea and Sphaeropteris. The same plastid regions were then evalu.....

Thesis Published 2017 1573 hits Available

Species richness and phytogeographic affinities of rattan genus Korthalsia in Malaysia

Azi Azeyanty Jamaludin

Abstract

The clustering climbing palm genus Korthalsia Blume (Arecaceae: Calamoideae: Calameae) is widespread in the Malesian region with 28 documented species. However, as many as 18 species are available in Malaysian rainforests. An inquiry was carried out in 2019 throughout Malaysia that included species richness and phytogeographic affinities for Korthalsia. Currently, Korthalsia is highly diverse in Sabah and Sarawak, with 15 species documented in this region, whereas 9 species are present in the Malay Peninsula. Species of Korthalsia were dominated by Korthalsia echinometra Becc., Korthalsia flagellaris Miq., Korthalsia hispida Becc., Korthalsia rigida Blume, and Korthalsia rostrata Blume, which suggests their prevalence in richness compared to being diverse; only 5 species found in all regions. The species accumulation curve indicates that this region's rattan community is moderately rich. There is an east-west separation for the distribution of rattan species in Peninsular Malaysia. Thi.....

Article Published 2023 412 hits Available

Mapping proteomic response to salinity stress tolerance in oil crops: Towrads enhanced plant resilience

Jameel R. Al-Obaidi, Azi Azeyanty Jamaludin

Abstract

Exposure to saline environments significantly hampers the growth and productivity of oil crops, harmfully affecting their nutritional quality and suitability for biofuel production. This presents a critical challenge, as understanding salt tolerance mechanisms in crops is key to improving their performance in coastal and high-salinity regions. Our content might be read more properly: This review assembles current knowledge on protein-level changes related to salinity resistance in oil crops. From an extensive analysis of proteomic research, featured here are key genes and cellular pathways which react to salt stress. The literature evinces that cutting-edge proteomic approaches − such as 2D-DIGE, IF-MS/MS, and iTRAQ − have been required to reveal protein expression patterns in oil crops under salt conditions. These studies consistently uncover dramatic shifts in protein abundance associated with important physiological activities including antioxidant defence, stress-related signal.....

Article Published 2024 565 hits Available

Kajian anatomi dan mikromorfologi daun beberapa spesies Anisoptera, Vatica dan Cotylelobium (Dipterocarpaceae)

Azi Azeyanty Jamaludin

Abstract

Kajian anatomi dan mikromorfologi daun telah dilakukan ke atas spesies-spesies terpilih dalam genus Anisoptera, Coty/elobium dan Vatica yang merupakan famili tumbuhan kayu balak daripada famili Dipterocarpaceae. Kajian ini dijalankan untuk melihat persamaan dan variasi ciri anatomi daun antara spesies yang dikaji yang boleh digunakan untuk pengecaman spesies. Kajian yang dilakukan melibatkan kaedah keratan rentas lamina, tulang daun, petiol dan tepi daun dengan menggunakan mikrotom gelongsor. Kaedah kikisan epidermis daun digunakan untuk mencerap ciri anatomi pada lapisan epidermis adaksial dan abaksial daun. Cerapan di bawah mikroskop imbasan elektron digunakan untuk melihat ciri mikromorfologi epidermis abaksial dan adaksial daun. Manakala kaedah penjernihan dilakukan untuk melihat ciri peruratan tengah dan tepi daun. Hasil kajian menunjukkan terdapat ciri umum dan variasi pada ketiga-tiga genus kajian. Variasi ciri anatomi dan mikromorfologi daun boleh .....

Thesis Published 2011 384 hits Available

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