Seasonal variation in photosynthesis and diel carbon balance under natural conditions in two Peperomia species that differ with respect to leaf anatomy

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AudienciaPúblico en generales_ES
CoberturaMéxicoes_ES
Fecha de ingreso2026-10-05T16:33:07Z
Fecha de publicación2009-01-01
ResumenFONDOM, N.Y. (Department of Botany, Miami University, Oxford, OH 45056), S. CASTRO-NAVA (Unidad Academica Multidisciplinaria Agronomia y Ciencias, Universidad Autonoma de Tamaulipas, Mexico), AND A. J. HUERTA (Department of Botany, Miami University, Oxford, OH 45056). Seasonal variation in photosynthesis and diel carbon balance under natural conditions in two Peperomia species that differ with respect to leaf anatomy. J. Torrey Bot. Soc. 136: 57-69. 2009.-The occurrence of crassulacean acid metabolism (CAM) and C-3 photosynthetic activities in Peperomia species has been linked to the differential distribution of C-3 and C-4 photosynthetic enzymes within the distinct leaf tissue layers. Our objectives were to test if relative thickness of the spongy mesophyll layer is an indication of CAM and if the distribution of water in the leaf tissue changes in response to drought. Under field conditions we studied photosynthesis and water relations of Peperonda obtusifolia and P. macrostachya, species that differ in leaf anatomy. Gas exchange and titratable acidity were measured over a complete 24 hour photoperiod. Plant water status was determined at dawn while chlorophyll a fluorescence data were collected during the day (12 noon). Thickness of the distinct leaf layers was determined with the aid of a calibrated light microscope. Gas exchange and titratable acidity showed that when well-hydrated, P. obtusifolia has typical C activity and P. macrostachya has typical CAM activity with spongy mesophyll layer thickness of 26\% and 76\% respectively. With almost the same proportion of spongy layer, P. macrostachya was found to exhibit reduced CAM activity while P. obtusifolia switch from C to CAM during the dry season. During the dry season, P. macrostachya did not show significant change in leaf osmotic potential, whereas P. obtusifolia had a significant increase at dawn, likely due to malic accumulation. Relative water content (RWC) was reduced significantly for both species during the dry season with severe reduction in P. macrostachya. Though there was a drastic reduction in RWC, no change in thickness was noticed within the water storing hydrenchyma. This, in addition to reduced CAM activity, could be an adaptation by the plant to drought. We also found that the distribution of water in the leaf tissue changes in response to drought, from the hydrenchyma to the chlorenchyma in P. obtusifolia, but not the case in P. macrostachya. Chlorophyll a fluorescence parameters Fo and qN were significantly higher during the dry season for both species, in contrast to Fv/Fm and Phi(PSII), values, an indication of photoinhibition resulting from drought. Thus, under well watered and natural conditions, a thicker spongy mesophyll correlates with the presence of CAM in the species studied.es_ES
Doihttps://doi.org/10.3159/08-ra-085r.1es_ES
URIhttps://riuat.uat.edu.mx/handle/123456789/4947
Idiomaenes_ES
EditorialTORREY BOTANICAL SOCes_ES
RelaciónJournal of the Torrey Botanical Societyes_ES
URL relacionadohttps://doi.org/10.3159/08-ra-085r.1es_ES
DerechosAcceso restringido / Suscripción (Metadatos de producción científica)es_ES
Licenciahttp://purl.org/coar/access_right/c_16eces_ES
FuenteJournal of the Torrey Botanical Society
Palabra clavechlorophyll fluorescencees_ES
Palabra clavecrassulacean acid metabolism (CAM)es_ES
Palabra clavediel carbon balancees_ES
Palabra clavegas exchangees_ES
Palabra clavehydrenchymaes_ES
Palabra clavephotosynthesises_ES
Palabra clavePSII quantum yield (Phi(PSII))es_ES
Palabra clavespongy mesophylles_ES
TítuloSeasonal variation in photosynthesis and diel carbon balance under natural conditions in two Peperomia species that differ with respect to leaf anatomyes_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
Número1es_ES
Rango de páginas57-69es_ES
URL relacionadahttps://doi.org/10.3159/08-ra-085r.1
Tipo de artículoIndexado
Tipo de artículoIndexadoes_ES
Volumen136es_ES

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