Catálogo CEIBA de la Biblioteca Central de FAUBA


Vista normal Vista MARC Vista ISBD

Effect of leaf rust [Puccinia triticina] on photosynthesis and related processes of leaves in wheat crops grown at two contrasting sites and with different nitrogen levels

Colaborador(es): Carretero, Ramiro | Bancal, Marie Odile | Miralles, Daniel Julio.
ISSN: 1161-0301.Tipo de material: Artículos y capítulos. Recurso electrónico.Tema(s): CONDUCTANCE | DARK RESPIRATION RATE | LEAF RUST | NON-STOMATAL PROCESS | PHOTOSYNTHESIS RATE | WHEAT [TRITICUM AESTIVUM L.] | BIOACCUMULATION | CROP PRODUCTION | DISEASE SEVERITY | FERTILIZER APPLICATION | GAS EXCHANGE | IRRADIANCE | LEAF | LIGHT AVAILABILITY | LIGHT USE EFFICIENCY | NITROGEN | PHOTOSYNTHESIS | PHYSIOLOGICAL RESPONSE | RESPIRATION | RUST DISEASE | WHEAT | YIELD RESPONSE | PUCCINIA TRITICINA | TRITICUM AESTIVUM | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR. En: European Journal of Agronomy vol.35, no.4 (2011), p.237-246Resumen: Leaf rust is one of the main diseases affecting wheat yield production. Considering the physiological variables that determine yield, diseases could affect radiation capture and/or radiation use efficiency. Reductions in radiation use efficiency may be mediated through effects on photosynthesis rate and related variables [i.e. dark respiration rate, stomatal conductance or photosynthesis events per se]. The aim of this study was to analyze the effects of leaf rust on wheat leaves photosynthesis rate and to understand which processes determining photosynthesis are affected by this pathogen. Gas exchange measurements were taken on flag leaves with various rust severity levels in experiments carried out on two locations which included different nitrogen fertilization rates and sowing dates. Leaf rust reduced net photosynthesis rate at light saturation through reductions in gross photosynthesis [average reduction: 6.1 umolCO2m-2greenareas-1] rather than through increases in dark respiration rate [average increase: 0.7 umolCO2m-2greenareas-1]. Changes in leaf nitrogen concentration did not modify the effects of leaf rust on net photosynthesis rate. Although net photosynthesis rate at light saturation was reduced, no effects were observed at low irradiance levels. The reduction of photosynthesis was due to effects on non-stomatal processes; indeed, important reductions of SPAD units [i.e. chlorophyll] were observed on green areas of diseased leaves. SPAD values on diseased leaves were 26.4±0.98 and 27.6±1.05 for N0 and N1 treatments, respectively; while on healthy leaves, values were 32.0±0.83 and 38.6±0.41, respectively.
Etiquetas de esta biblioteca: No hay etiquetas de esta biblioteca para este título. Ingresar para agregar etiquetas.
    valoración media: 0.0 (0 votos)

Leaf rust is one of the main diseases affecting wheat yield production. Considering the physiological variables that determine yield, diseases could affect radiation capture and/or radiation use efficiency. Reductions in radiation use efficiency may be mediated through effects on photosynthesis rate and related variables [i.e. dark respiration rate, stomatal conductance or photosynthesis events per se]. The aim of this study was to analyze the effects of leaf rust on wheat leaves photosynthesis rate and to understand which processes determining photosynthesis are affected by this pathogen. Gas exchange measurements were taken on flag leaves with various rust severity levels in experiments carried out on two locations which included different nitrogen fertilization rates and sowing dates. Leaf rust reduced net photosynthesis rate at light saturation through reductions in gross photosynthesis [average reduction: 6.1 umolCO2m-2greenareas-1] rather than through increases in dark respiration rate [average increase: 0.7 umolCO2m-2greenareas-1]. Changes in leaf nitrogen concentration did not modify the effects of leaf rust on net photosynthesis rate. Although net photosynthesis rate at light saturation was reduced, no effects were observed at low irradiance levels. The reduction of photosynthesis was due to effects on non-stomatal processes; indeed, important reductions of SPAD units [i.e. chlorophyll] were observed on green areas of diseased leaves. SPAD values on diseased leaves were 26.4±0.98 and 27.6±1.05 for N0 and N1 treatments, respectively; while on healthy leaves, values were 32.0±0.83 and 38.6±0.41, respectively.

No hay comentarios para este ítem.

Ingresar a su cuenta para colocar un comentario.

Av. San Martín 4453 - 1417 – CABA – Argentina.
Sala de lectura de Planta Baja: bibliote@agro.uba.ar (54 11) 5287-0013
Referencia: referen@agro.uba.ar (54 11) 5287-0418
Hemeroteca: hemerote@agro.uba.ar (54 11) 5287-0218