Taxonomic and physioecological significance of the floral-surface micromorphology of Vanda helvola and Vanda dearie (Orchidaceae)

Ling Swee Chie, . and Besi Edward Entalai, . and Rusea Go, . Taxonomic and physioecological significance of the floral-surface micromorphology of Vanda helvola and Vanda dearie (Orchidaceae). pp. 22-34. ISSN 2672-7226

The Vanda orchid is appreciated for its large beautiful scented flowers. Anatomical enumeration of the most compatible Vanda species holds interesting and under-investigated aspects. We conducted an in-depth investigation into the floral-surface micromorphology of V. helvola and V. dearei and assessed the significance in taxonomic delimitation using scanning electron microscopy (SEM) to feasibly answer questions on the reported dubious origins of certain Vanda species and hybrids. Floral trichomes including papillae structures stomata epicuticular ornamentation and waxes were enumerated and compared between the selected species. Findings based on the photomicrographs revealed that V. helvola and V. dearei were comparable based on the diversity and dissemination of trichomes stomata and epicuticular ornamentation. Noteworthy was the heterogeneous occurrence of distinguishing barrel-shaped glandular trichomes with aperture which might also function as nectaries and branched glandular and biseriate trichomes on the labellum of V. helvola but was absent in V. dearei. In contrast an aggregation of conical papillae occurred on the spur of V. dearei but lacking in V. helvola. We also employed SEM observations to understand the role of surface microstructures in physio-ecological functions. The glandular trichomes and stomata were presumed to be secretory structures for the unique scents of V. helvola and V. dearei.

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Abstract

The Vanda orchid is appreciated for its large beautiful scented flowers. Anatomical enumeration of the most compatible Vanda species holds interesting and under-investigated aspects. We conducted an in-depth investigation into the floral-surface micromorphology of V. helvola and V. dearei and assessed the significance in taxonomic delimitation using scanning electron microscopy (SEM) to feasibly answer questions on the reported dubious origins of certain Vanda species and hybrids. Floral trichomes including papillae structures stomata epicuticular ornamentation and waxes were enumerated and compared between the selected species. Findings based on the photomicrographs revealed that V. helvola and V. dearei were comparable based on the diversity and dissemination of trichomes stomata and epicuticular ornamentation. Noteworthy was the heterogeneous occurrence of distinguishing barrel-shaped glandular trichomes with aperture which might also function as nectaries and branched glandular and biseriate trichomes on the labellum of V. helvola but was absent in V. dearei. In contrast an aggregation of conical papillae occurred on the spur of V. dearei but lacking in V. helvola. We also employed SEM observations to understand the role of surface microstructures in physio-ecological functions. The glandular trichomes and stomata were presumed to be secretory structures for the unique scents of V. helvola and V. dearei.

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Item Type:	Article
AGROVOC Term:	Floral initiation
AGROVOC Term:	Orchidaceae
AGROVOC Term:	Ecological control
AGROVOC Term:	Sampling
AGROVOC Term:	Plant morphology
AGROVOC Term:	Hybridization
AGROVOC Term:	Chemical compounds
AGROVOC Term:	Recognition of species
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:55
URI:	http://webagris.upm.edu.my/id/eprint/9975

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