Pollinator attraction devices (floral fragrances) of some Brazilian orchids

Reis, Mariza Gomes; Pansarim, Emerson R.; Silva, Ubiratan F. da; Amaral, Maria do Carmo Estanislau do; Marsaioli, Anita Jocelyne

doi:10.3998/ark.5550190.0005.614

Cited by 13 publications

(2 citation statements)

References 11 publications

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“…The unique chemical profile observed in Cluster 1 (C1) of A. judaica samples, obtained from Saudi Arabia and Egypt’s Matrouh Governorate, is likely influenced by a combination of environmental and genetic factors. The Köppen–Geiger climate classification system identifies both regions as predominantly hot desert climates (BWh/BSh) [ 30 ], which may induce the production of specific volatile compounds like camphor, known for their potential roles in heat stress tolerance [ 31 , 32 ], herbivore deterrence [ 33 ], and pollinator attraction [ 34 ]. Furthermore, variations in soil composition and altitude within the C1 regions, as well as genetic variability within and between Artemisia populations, could contribute to the observed chemical diversity [ 35 , 36 , 37 ].…”

Section: Discussionmentioning

confidence: 99%

Chemical Composition and Cytotoxicity Evaluation of Artemisia judaica L. Essential Oil from Saudi Arabia

Alsharif,

Bashir,

Boylan

2024

Molecules

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Gas chromatography (GC) and gas chromatography–mass spectrometry (GC–MS) analyses were conducted on essential oil extracted from Saudi Arabian Artemisia judaica L. (A. judaica) aerial parts, resulting in the identification of 58 constituents, representing 93.0% of the total oil composition. The oil primarily consisted of monoterpenes (38.6%), sesquiterpenes (14.1%), and other compounds such as ethyl esters and cyclic ketones (40.3%). The main components identified were piperitone (16.5%), ethyl cinnamate (12.9%), and camphor (9.7%). Multivariate statistical analyses (MVAs), including principal component analysis (PCA) and agglomerative hierarchical clustering (AHC) analysis, were employed to compare the chemical makeup of this oil with 20 other A. judaica oils from various regions. The study revealed distinct clusters, highlighting unique chemotypes and geographic variations. Particularly, the oil from the current study demonstrated a specialized chemical profile with significant concentrations of specific compounds, contributing significantly to its distinctiveness. Further cytotoxicity testing on RAW264.7 macrophages suggested that concentrations below 20 μg/mL of A. judaica oil are suitable for future pharmacological investigations. This study provides valuable insights into the chemical diversity, geographic variations, and potential biomedical applications of these essential oils.

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Section: Discussionmentioning

confidence: 99%

Chemical Composition and Cytotoxicity Evaluation of Artemisia judaica L. Essential Oil from Saudi Arabia

Alsharif,

Bashir,

Boylan

2024

Molecules

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“…Fan et al (2019) have indeed agreed to this method since this approach is indeed sensitive and effective in finding scent-related volatiles of Camellia species. On the contrary, (Reis et al 2004) reported SPME is not effective method to trap volatiles emitted from Stanhopea, Polystachya and Epidendrum orchids, which may suggest SPME performance was varied across species.…”

Section: Effect Of Different Observation Period On the Phalaenopsis Bellina Floral Scent Emissionmentioning

confidence: 99%

November 2020

2020

Plant Omics

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Phalaenopsis bellina, is an orchid widely known for their distinctive fragrance. Of late, fragrant orchids are getting more attention from Orchid breeders for their horticultural market value. Although volatile compounds have been identified in several orchid species, the floral scent emission of P. bellina is far from understood. Therefore, this study was carried out to investigate the influence of different timing and floral development stages on the volatile emissions from P. bellina flowers using Solid Phase Micro Extraction (SPME) and Gas Chromatography-Mass Spectrometry (GC-MS). The volatile compound was extracted during morning and afternoon sessions from three different floral developmental stages. The volatile compounds emitted from flowers from two different sessions were trapped with SPME fiber for 30 minutes before directly injected into GC-MS for identification. Results showed that approximately 79 volatile compounds were identified, with the terpenoid presented as the major compound class. P. bellina had the highest number of volatiles during the morning and full bloom (41), with 29.82% monoterpene and 23.33% sesquiterpenes accounted in total. α-farnesene (19.56%) was abundance during morning emission and remains as the highest volatile in afternoon emission (44.08%), even higher when compared to morning emission. However, a decrease in the volatile compound was observed in afternoon emission, in which only 34 volatile compounds detected. Meanwhile, partial bloom developmental stage revealed linalool as the major terpenoid volatile compounds (25.89%), with only 20 volatile compounds recorded. On the other hand, no volatile compounds were recorded and profiled from flower bud stage. The establishment of a floral scent study provides a brief overview of the regulation of fragrance in P. bellina, which can be continued through gene isolation or fragrance-related enzymes study. This information will provide necessary information on orchid floral scent research that useful in boosting horticultural trade of the scented orchids and their function in pollination ecology study.

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Labellum and gynostemium micromorphology in Polystachya (Orchidaceae)

et al. 2020

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Polystachya is a large, pantropical orchid genus of 200 species, most of which occur as epiphytes in sub-saharan Africa. The three-lobed labellum of most Polystachya species possesses a fleshy callus and various types of trichomes and papillae. In this paper, we present the results of micromorphological studies on the labellum of 20 species, representing eight of the 13 sections in the genus, using scanning electron microscopy (SEM). Our results show the scale of infrageneric diversity of trichomes and papillae relative to the sampled sections. They also demonstrate the taxonomic value of labellar micromorphology at the sectional level. The study revealed seven types of papillae and five types of trichomes (uni- and multi-cellular) in Polystachya, some of which, are described here for the first time. Clavate trichomes are the most common and are present in 60% of the species studied. Moniliform trichomes mainly occur in sect. Polystachya and are strongly characteristic of the section. Pseudopollen is formed by fragmentation of moniliform trichomes or the detachment of other trichomes as bicellular units. We provide, for the first time, evidence for the detachment of the terminal cells of capitate trichomes.

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Pollinator attraction devices (floral fragrances) of some Brazilian orchids

Cited by 13 publications

References 11 publications

Chemical Composition and Cytotoxicity Evaluation of Artemisia judaica L. Essential Oil from Saudi Arabia

Chemical Composition and Cytotoxicity Evaluation of Artemisia judaica L. Essential Oil from Saudi Arabia

November 2020

Labellum and gynostemium micromorphology in Polystachya (Orchidaceae)

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