Repositorio UFRO · Omeka S

Photosynthetic impairment caused by manganese toxicity and associated antioxidative responses in perennial ryegrass

Primer Autor	Ribera, Alejandra E.
Co-autores	Reyes-Diaz, Marjorie M. Alberdi, Miren R. Alvarez-Cortez, Daniela A. Rengel, Zed de la Luz Mora, Maria
Título	Photosynthetic impairment caused by manganese toxicity and associated antioxidative responses in perennial ryegrass
Editorial	CSIRO PUBLISHING
Revista	CROP & PASTURE SCIENCE
Lenguaje	en
Resumen	Manganese (Mn) toxicity can induce oxidative stress and impair photosynthesis in plants. The activity of antioxidant enzymes such as superoxide dismutase (SOD) is increased in Lolium perenne (perennial ryegrass) in response to Mn toxicity (mainly in tolerant cultivars), but it remains unclear whether non-enzymatic antioxidant compounds may have a role in Mn tolerance. Seedlings of perennial ryegrass cv. Nui (Mn-sensitive) and cv. Kingston (Mn-tolerant) were grown in a greenhouse in nutrient solution at increasing Mn doses over 21 days. Even though both cultivars showed similar Mn uptake, dry weight decreases and lipid peroxidation caused by excess Mn were higher in cv. Nui than in Mn-tolerant Kingston. Maximum quantum yield of photosystem II (PSII) (Fv/Fm) declined only in cv. Nui at the highest Mn dose. Effective quantum yield (K PSII), electron transport rate, CO2 assimilation, and total chlorophyll concentration in leaves decreased under excess Mn, particularly in the sensitive cultivar. Interestingly, chlorophyll a/b ratio increased (indicating relatively lower concentration of light-harvesting chlorophyll proteins as an adaptive defence mechanism) with an increase in Mn supply only in cv. Kingston, which partially explained its greater Mn tolerance compared with Nui. Concentration of carotenoids was not directly associated with non-photochemical quenching values, suggesting that ryegrass did not dissipate an excess of absorbed energy under Mn toxicity by this mechanism. At increasing excess Mn, both enzymatic (SOD activity) and non-enzymatic antioxidant responses (radical scavenging ability and phenolic concentration) were enhanced, mainly in Kingston. The enhanced antioxidant response in this cultivar suggests the hypothesis of increased capacity to control Mn-triggered oxidative stress as reflected in the reduced lipid peroxidation.
Tipo de Recurso	Artículo original
Description	This work was supported by FONDECYT No. 11100494 grants. Este trabajo fue financiado por la subvención FONDECYT n.° 11100494.
doi	10.1071/CP13161
Formato Recurso	pdf
Palabras Claves	antioxidative compounds manganese tolerance perennial ryegrass photosynthesis superoxide dismutase MN TOXICITY PHENOLIC-COMPOUNDS SUPEROXIDE DISMUTASES CHLOROPLAST LAMELLAE PIGMENT COMPOSITION EXCESS MANGANESE OXIDATIVE STRESS TOLERANCE PLANTS L. compuestos antioxidantes tolerancia al manganeso raigrás perenne fotosíntesis superóxido dismutasa TOXICIDAD DEL MN COMPUESTOS FENÓLICOS SUPERÓXIDO DISMUTASAS LÁMINAS DE CLOROPLASTOS COMPOSICIÓN DE PIGMENTOS EXCESO DE MANGANESO ESTRÉS OXIDATIVO TOLERANCIA PLANTAS L.
Ubicación del archivo	http://dx.doi.org/10.1071/CP13161
Materias	antioxidative compounds manganese tolerance perennial ryegrass photosynthesis superoxide dismutase MN TOXICITY PHENOLIC-COMPOUNDS SUPEROXIDE DISMUTASES CHLOROPLAST LAMELLAE PIGMENT COMPOSITION EXCESS MANGANESE OXIDATIVE STRESS TOLERANCE PLANTS L. compuestos antioxidantes tolerancia al manganeso raigrás perenne fotosíntesis superóxido dismutasa TOXICIDAD DEL MN COMPUESTOS FENÓLICOS SUPERÓXIDO DISMUTASAS LÁMINAS DE CLOROPLASTOS COMPOSICIÓN DE PIGMENTOS EXCESO DE MANGANESO ESTRÉS OXIDATIVO TOLERANCIA PLANTAS L.
Disciplinas de la OCDE	Agronomía Botánica Fisiología
Título de la cita (Recomendado-único)	Photosynthetic impairment caused by manganese toxicity and associated antioxidative responses in perennial ryegrass
Revista/Libro	CROP & PASTURE SCIENCE
Tipo de ruta	hibrida verde
Access Rights	metadata
Derechos de acceso	metadata
Idioma	en
Identificador del recurso (Mandatado-único)	Artículo original
Versión del recurso (Recomendado-único)	versión publicada
Entidad financiadora	ANID CONICYT FONDECYT 11100494
Referencia del Financiador (Mandatado si es aplicable-repetible)	ANID CONICYT FONDECYT 11100494
Editorial	CSIRO PUBLISHING
ISSN	1836-0947
Página de inicio (Recomendado-único)	696
Página final (Recomendado-único)	707
Categoría WOS	Agricultura, Multidisciplinaria Agriculture, Multidisciplinary
Formato	pdf
Id de Web of Science	WOS:000325284400007