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

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...

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Detalles Bibliográficos
Otros Autores: Carretero, Ramiro, Bancal, Marie Odile, Miralles, Daniel Julio
Formato: Artículo
Lenguaje:Inglés
Materias:
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
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2011Carretero.pdf
LINK AL EDITOR
Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central (FAUBA) de Universidad de Buenos Aires
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245 1 0 |a 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 
520 |a 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. 
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653 0 |a WHEAT [TRITICUM AESTIVUM L.] 
653 0 |a BIOACCUMULATION 
653 0 |a CROP PRODUCTION 
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653 0 |a FERTILIZER APPLICATION 
653 0 |a GAS EXCHANGE 
653 0 |a IRRADIANCE 
653 0 |a LEAF 
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653 0 |a NITROGEN 
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773 |t European Journal of Agronomy  |g Vol.35, no.4 (2011), p.237-246 
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900 |a ^aCarretero^bR.^tCátedra de Cerealicultura, Universidad de Buenos Aires, Av. San Martín 4453, C1417DSE Buenos Aires, Argentina 
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900 |a WHEAT [TRITICUM AESTIVUM L.] 
900 |a BIOACCUMULATION 
900 |a CROP PRODUCTION 
900 |a DISEASE SEVERITY 
900 |a FERTILIZER APPLICATION 
900 |a GAS EXCHANGE 
900 |a IRRADIANCE 
900 |a LEAF 
900 |a LIGHT AVAILABILITY 
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