Field assessment of sub-epidermal leaf anthocyanin, PSII photochemistry, and the xanthophyll-cycle as photoprotective mechanisms in two morphs of Agave striata

Simple item page
AudienciaPúblico en generales_ES
CoberturaMéxicoes_ES
Fecha de ingreso2026-10-05T16:33:13Z
Fecha de publicación2014-01-01
ResumenWe tested the hypothesis that leaf epidermal pigments screen light of particular wavelengths from reaching the photosynthetic machinery, reducing dependence on the xanthophyll-cycle as an energy dissipation process. Under field conditions, photosynthesis and water relations were studied in two morphs of Agave strima that differ in leaf coloration (green vs. reddish-purple). Titratable acidity, chlorophyll fluorescence, and internal and surface leaf temperatures were measured under low irradiance by shading (30\%) and full sunlight (100\%) for six days. We also measured the reflectance ratio (R-RED: R-GREEN), an index of anthocyanin content and the change in photochemical reflectance index (Delta PRI), an index of xanthophyll-cycle de-epoxidation state (xanthophyll conversion). Our results showed that both morphs expressed typical CAM-activity with no significant differences under sun vs. shade. However, shading did reduce titratable acids in both morphs. Both morphs were well hydrated, with the relative water content (RWC) being greater than 93\%. Leaf surface temperature was found to be significantly higher during the day in the green morph compared to the red morph under sun and shade. Dark level fluorescence (Fo), photochemical efficiency of PSII (Fv/Fm), and the quantum yield of PSH electron transport (Phi(PSII)) were higher in the red morph under sun compared to the green morph. The value of qN (non-photochemical quenching) was significantly higher during the day for the green morph compared to the red morph and this higher qN value was associated with a greater xanthophyll conversion and surface leaf temperature. However, sunlight did not predispose either of the morphs to photoinhibition. It is clear that the sub-epidermal anthocyanins serve as a photoprotective mechanism in the red morph, screening light energy from reaching the photosynthetic machinery and reducing dependence on the xanthophyll-cycle. We concluded that under natural light conditions the leaves of two morphs tested utilized differential photoprotective mechanisms. (C) 2014 Elsevier GmbH. All rights reserved.es_ES
Doihttps://doi.org/10.1016/j.flora.2013.12.006es_ES
URIhttps://riuat.uat.edu.mx/handle/123456789/5060
Idiomaenes_ES
EditorialELSEVIER GMBH, URBAN \& FISCHER VERLAGes_ES
RelaciónFlora: Morphology, Distribution, Functional Ecology of Plantses_ES
URL relacionadohttps://doi.org/10.1016/j.flora.2013.12.006es_ES
DerechosAcceso restringido / Suscripción (Metadatos de producción científica)es_ES
Licenciahttp://purl.org/coar/access_right/c_16eces_ES
FuenteFlora: Morphology, Distribution, Functional Ecology of Plants
Palabra claveCAMes_ES
Palabra clavePhotosynthesises_ES
Palabra claveChlorophyll fluorescencees_ES
Palabra clavePSII quantum yieldes_ES
Palabra claveNon-photochemical quenchinges_ES
Palabra claveLeaf absorptancees_ES
TítuloField assessment of sub-epidermal leaf anthocyanin, PSII photochemistry, and the xanthophyll-cycle as photoprotective mechanisms in two morphs of Agave striataes_ES
TipoArtículoes_ES
ArbitradoHa sido Arbitradoes_ES
AutorFondom, Nicolas Y.
AutorCastro-Nava, Sergio
AutorHuerta, Alfredo J.
AutorFondom, Nicolas Y.es_ES
AutorCastro-Nava, Sergioes_ES
AutorHuerta, Alfredo J.es_ES
InstituciónUniversidad Autónoma de Tamaulipas
InstituciónUniversidad Autónoma de Tamaulipases_ES
Número2es_ES
Rango de páginas131-141es_ES
URL relacionadahttps://doi.org/10.1016/j.flora.2013.12.006
Tipo de artículoIndexado
Tipo de artículoIndexadoes_ES
Volumen209es_ES

Files

Collections

Documentación Cientifica