Morphological delimitation of Durio dulcis Becc. and Durio graveolens Becc. based on comparative leaf traits

Wan Sahidallah, Wan Nurnasreen Nasuha and Azlan, Noor Alyia and Che Amri, Che Nurul Aini and Mohd Yunus, Noor Syaheera and Ghazalli, Mohd Norfaizal and Laham, Muhammed Nazmi and Shahari, Rozilawati (2026) Morphological delimitation of Durio dulcis Becc. and Durio graveolens Becc. based on comparative leaf traits. Journal of Tropical Resources and Sustainable Science, 14 (2). pp. 316-324. ISSN 2289-3946 E-ISSN 2462-2389

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Abstract

This study presents a comparative analysis of leaf morphology in Durio dulcis and Durio graveolens. A total of 12 accessions were analysed using 35 leaf morphological parameters, including leaf organisation, structure, and surface characteristics. The leaf specimens were obtained from the MARDI gene bank in Jerangau, Terengganu, and examined using standardised botanical methodologies. Cluster analysis using the unweighted pair group method with arithmetic mean (UPGMA) method based on Gower’s similarity coefficient demonstrated clear interspecific separation, indicating clear morphological differentiation between the two species. Although both species exhibited similar characteristics, including simple leaf type, petiolate attachment, and entire margins, significant variations were observed in petiole width (broader in D. graveolens), leaf sizes (larger in D. graveolens), apex and base morphology, leaf shape variability, venation clarity, and trichome distribution (denser abaxial indumentum in D. graveolens). Fourteen morphological characteristics were identified as key diagnostic markers for species delimitation, including petiole width (upper and base), leaf length and width, apex angle and shape, and venation clarity. These findings highlight the significance of detailed leaf morphology in Durio classification and provide vital baseline data for conservation, phylogenetic analysis, and future crop enhancement research

Item Type:	Article (Journal)
Uncontrolled Keywords:	Durio dulcis, Durio graveolens, taxonomic delimitation, diagnostic characters, cluster analysis, germplasm characterization
Subjects:	Q Science > QK Botany
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science Kulliyyah of Science > Department of Plant Science
Depositing User:	Rozilawati Shahari
Date Deposited:	14 Jul 2026 15:14
Last Update:	14 Jul 2026 15:14
Queue Number:	2026-07-Q3946
URI:	http://irep.iium.edu.my/id/eprint/129769

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