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Volatile Components in the Flower, Pedicellate Ovary and Aqueous Residue of <i>Cymbidium</i>sp. (ORCHIDACEAE)

Journal of Analytical Sciences, Methods and Instrumentation 2013年第4期3卷 212-218页

作者： Víctor García Gaytán María de las Nieves Rodríguez Mendoza Marcos Soto Hernández Libia I. Trejo-Téllez Martha E. Pedraza Santos Guadalupe Valdovinos Ponce Facultad de Agrobiología “Presidente Juárez” Uruapan México 4postgrado en fitosanidad Colegio de Postgraduados Texcoco México. postgrado en Botánica Colegio de Postgraduados Texcoco México postgrado en Edafología Colegio de Postgraduados Texcoco México postgrado en fitosanidad Colegio de Postgraduados Texcoco México. Víctor García Gaytán

Cymbidium sp. has several ornamental, medicinal and cosmetic uses. Essential oils were obtained through extraction by hydrodistillation of flower and pedicellate ovary. The chromatographic profile was obtained by thin layer chromatography (TLC), combined with gas chromatography-mass spectrometry (GC/MS), for the identification and relative quantification of various substances in three samples from the orchid (flower, pedicellate ovary and aqueous residue). With TLC, five compounds were identified in the flower, with the most abundant being terpineol, linalool and zingiberene, and five in the pedicellate ovary, with borneol, cineole, and β-bisabolene being in the greatest concentration, while for the aqueous residue, the most abundant was geraniol. Using GC/MS, 25 volatile components associated with the flower were identified, of which the most abundant were linalool (22.92%), 4-methyl-phenol (15.07%) and p-Menth-1-en-8-ol (12.32%). In pedicellate ovaries, 13 components were identified, with the most abundant being 4-methyl-phenol (31.24%), bicycle [4.4.0] dec-1-ene, 2-isopropyl-5-methyl-9-methylene-(17.74%) and 2-hexanone (10.24%), while in the aqueous residue 18 components were found, with the most abundant being 4-methyl-phenol (18.71%) and 2- cyclohexen-1-ol (14.60%).

关键词： Thin Layer Chromatography Gas Chromatography Orchidaceae Hydrodistillation

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Damaging Agents and Tree’s Health Condition in an Urban Forest

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Open Journal of Forestry 2021年第3期11卷 238-253页

作者： Luz de Lourdes Saavedra-Romero Tomás Martínez-Trinidad Dionicio Alvarado-Rosales Patricia Hernández-de la Rosa Jaime Villa-Castillo postgrado en fitosanidad-Fitopatología Colegio de Postgraduados Campus Montecillo Texcoco Estado de México postgrado en Ciencias Forestales Colegio de Postgraduados Campus Montecillo Texcoco Estado de México Consultor Independiente Colegio de Postgraduados Campus Montecillo Texcoco Estado de México

Urban trees are subjected to different damaging agents throughout their lifetime. The aims of this study were to identify tree damaging agents, and to obtain a Damage Severity Index (DSI) in order to categorize tree health condition at San Juan de Aragon Park. Each tree was identified at species level in 28 randomly established plots in ten sections of the study area. Up to two types of damage were recorded per tree, based on the FIA (Forest Inventory an Analysis Program) protocol, and a DSI was obtained for each damaged tree considering location of damage, nature of the damaging agent and severity. A total of 753 trees were assessed and 12 species and 27 damaging agents were identified. Cankers, galls, the pepper tree psyllid and the red gum lerp psyllid were the most frequent damaging agents. Australian pine, red gum, Mediterranean cypress, Mexican white cedar, and California pepper were the most affected species. The DSI ranged from 3 to 17 and the average was 7.9. Sections J and H and the species California pepper, Australian pine, and Mexican white cedar presented the highest DSI. The tree population had a moderate health condition, while the aforementioned sections and tree species showed the poorest.

关键词： Damaging Agents Urban Trees Bleeding Cankers Galls Health Categories Damage Severity Index

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