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Developmental changes in the presence of ROS (reactive oxygen species) in the stigma and their relationships with stigma functionality

AuthorsAlché Ramírez, Juan de Dios; Rejón, Juan David; Jiménez-Quesada, María José; Rodríguez García, María I.; Zafra, Adoración
KeywordsReproductive development
Issue Date2010
PublisherGrupo Geyseco
AbstractThe presence of reactive oxygen species (ROS) and NO in the reproductive tissues of several Angiosperms has been investigated. Early studies have shown that these molecules play putative roles as signaling molecules during the interaction pollen-pistil. However, their occurrence in other reproductive phases has not been investigated. We have analyzed the presence of ROS and NO in floral tissues over different developmental stages (unopened flower buds, recently opened flowers, dehiscent anthers and flowers after fertilization) by using different fluorophores and confocal laser scanning microscopy. The study was carried out in species with different types of stigmas and systems of compatibility (olive tree, orange, tomato, pepper, pea and A. thaliana). Although the presence of ROS in the stigmas was detected at higher levels during those developmental phases considered “receptive” to pollen interaction, these molecules were also present at early (unopened flower) or later (post-fertilization) stages. The biological significance of the presence of these products may differ between these stages, including defence functions, signaling and senescence. The study confirms the enhanced production of NO by pollen grains and tubes during the receptive phase, and the decrease in the presence of ROS when NO is actively produced.
DescriptionResumen de la comunicación oral presentada en el XVII Congress of the Federation of European Societies of Plant Biology (FESPB), celebrado del 4 al 9 de Julio de 2010 en Valencia.-- P04-010.
Publisher version (URL)http://www.geyseco.es/fespb/fespb.html
Appears in Collections:(EEZ) Comunicaciones congresos
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