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Volatiles and nonvolatiles in Flourensia campestris GRISEB. (Asteraceae), how much do capitate glandular trichomes matter?

Colaborador(es): Piazza, Leonardo Alberto. Universidad de Buenos Aires. Facultad de Agronomía. Sede Punilla. Córdoba, Argentina | López, Daniela. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales (INBA). Buenos Aires, Argentina. CONICET – Universidad de Buenos Aires. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina | Silva, Mariana P. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales (INBA). Buenos Aires, Argentina. CONICET – Universidad de Buenos Aires. Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura (IFEVA). Buenos Aires, Argentina | López Rivilli, Marisa J. Universidad de Buenos Aires. Facultad de Agronomía. Sede Punilla. Córdoba, Argentina | Tourn, Graciela Mónica. Universidad de Buenos Aires. Facultad de Agronomía. Sede Punilla. Córdoba, Argentina | Cantero, Juan José. Universidad de Río Cuarto. Facultad de Agronomía y Veterinaria. Cátedra de Botánica Sistemática Agrícola. Córdoba, Argentina. Universidad Nacional de Córdoba. Instituto Multidisciplinario de Biología Vegetal (IMBIV). Córdoba, Argentina. CONICET - Universidad Nacional de Córdoba. Córdoba, Argentina | Scopel, Ana Leonor. Universidad de Buenos Aires. Facultad de Agronomía. Sede Punilla. Córdoba, Argentina. Universidad de Buenos Aires. Facultad de Agronomía. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales (INBA). Buenos Aires, Argentina. CONICET – Universidad de Buenos Aires. Instituto de Investigaciones en Biociencias Agrícolas y Ambientales (INBA). Buenos Aires, Argentina.
ISSN: 1612-1880.Tipo de material: Artículos y capítulos. Recurso electrónico.Tema(s): HAMANASIC ACID A | GLYCINE BETAINE | 4-HYDROXYACETOPHENONE | 2-HYDROXY-5-METHOXYACETOPHENONE | ESSENTIAL OILS | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR En: Chemistry and Biodiversity Vol. 15, no.3 (2018), e1700511, 15 p., tbls., grafs., fot.Resumen: The distribution and ultrastructure of capitate glandular trichomes (GTs) in Flourensia species (Asteraceae) have been recently elucidated, but their metabolic activity and potential biological function remain unexplored. Selective nonvolatile metabolites from isolated GTs were trikingly similar to those found on leaf surfaces. The phytotoxic allelochemical sesquiterpene (–)-hamanasic acid A ((–)-HAA) was the major constituent (ca. 40%) in GTs. Although GTs are quaternary ammonium compounds (QACs)-accumulating species, glycine betaine was not found in GTs; it was only present in the leaf mesophyll. Two (–)-HAA accompanying surface secreted products: compounds 4-hydroxyacetophenone (piceol; 1) and 2-hydroxy- -methoxyacetophenone (2), which were isolated and fully characterized (GC/MS, NMR), were present in the volatiles found in GTs. The essential oils of fresh leaves revealed ca. 33% monoterpenes, 26% hydrocarbon- and 30% oxygenated sesquiterpenes, most of them related to cadinene and bisabolene derivatives. Present results suggest a main role of GTs in determining the volatile and nonvolatile composition of F. campestris leaves. Based on the known activities of the compounds identified, it can be suggested that GTs in F. campestris would play key ecological functions in plant-pathogen and plant-plant interactions. In addition, the strikingly high contribution of compounds derived from cadinene and bisabolene pathways, highlights the potential of this species as a source of high - valued bioproducts.
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The distribution and ultrastructure of capitate glandular trichomes (GTs) in Flourensia species (Asteraceae) have been recently elucidated, but their metabolic activity and potential biological function remain unexplored.
Selective nonvolatile metabolites from isolated GTs were trikingly similar to those found on leaf surfaces.
The phytotoxic allelochemical sesquiterpene (–)-hamanasic acid A ((–)-HAA) was the major constituent (ca. 40%) in GTs.
Although GTs are quaternary ammonium compounds (QACs)-accumulating species, glycine betaine was not found in GTs; it was only present in the leaf mesophyll.
Two (–)-HAA accompanying surface secreted products: compounds 4-hydroxyacetophenone (piceol; 1) and 2-hydroxy- -methoxyacetophenone (2), which were isolated and fully characterized (GC/MS, NMR), were present in the volatiles found in GTs.
The essential oils of fresh leaves revealed ca. 33% monoterpenes, 26% hydrocarbon- and 30% oxygenated sesquiterpenes, most of them related to cadinene and bisabolene derivatives.
Present results suggest a main role of GTs in determining the volatile and nonvolatile composition of F. campestris leaves.
Based on the known activities of the compounds identified, it can be suggested that GTs in F. campestris would play key ecological functions in plant-pathogen and plant-plant interactions.
In addition, the strikingly high contribution of compounds derived from cadinene and bisabolene pathways, highlights the potential of this species as a source of high - valued bioproducts.

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