Early responses to manganese (Mn) excess and its relation to antioxidant performance and organic acid exudation in barley cultivars

Abstract: Manganese (Mn) is an essential micronutrient for plants, and is necessary for biochemical and physiological processes. The objective of this research was to determine the early responses to Mn excess and its relation to antioxidant performance mechanisms and organic acid exudation in comme...

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Autores principales:	Millaleo,Rayen, Rao,Maria, Ulloa-Inostroza,Elizabeth, Duran,Paola, Mora,Maria de La Luz
Lenguaje:	English
Publicado:	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo 2018
Materias:	Manganese excess barley organic anion exudation antioxidant system
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162018000401206
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spelling	oai:scielo:S0718-951620180004012062019-02-05Early responses to manganese (Mn) excess and its relation to antioxidant performance and organic acid exudation in barley cultivarsMillaleo,RayenRao,MariaUlloa-Inostroza,ElizabethDuran,PaolaMora,Maria de La Luz Manganese excess barley organic anion exudation antioxidant system Abstract: Manganese (Mn) is an essential micronutrient for plants, and is necessary for biochemical and physiological processes. The objective of this research was to determine the early responses to Mn excess and its relation to antioxidant performance mechanisms and organic acid exudation in commercial barley cultivars. We determined early responses to Mn excess in four barley cultivars (Barke, Tatoo, Scarlett, Sebastian), which were subjected to increasing Mn concentrations (2.4-150-350-750-1500 µM Mn), pH 4.8, under nutrient solution during seven days. Results showed that plant growth parameters: biomass, length and relative growth rate (RGR) were negatively altered with the higher Mn treatments. Antioxidant performance such as antioxidant activity (AA) and antioxidant enzymes such as superoxidase dismutase (SOD) were activated in presence of excess Mn. Oxalate was the major organic acid roots exudate, and the cultivar Sebastian had the highest oxalate exudation. In conclusion, Tatoo and Sebastian are proposed as the most Mn tolerant cutvars given that the biomass parameters were not affected by increasing Mn doses, showing major oxalate exudation. It is suggested that the mechanisms associated to Mn alleviation could be attributed to SOD, AA and organic acid production, mainly oxalate, in tolerant cultivars (Sebastian, Tatoo) together to significant decrease of total phenols (TP) in shoot of sensitive cultivars (Barke and Scarlett). Non-enzymatic barriers were not related to early responses, and an enzymatic barrier and oxalate exudation were considered as early indicators of Mn stress, projecting that the tolerance of Mn-tolerant cultivars could increase under field conditions.info:eu-repo/semantics/openAccessChilean Society of Soil Science / Sociedad Chilena de la Ciencia del SueloJournal of soil science and plant nutrition v.18 n.4 20182018-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162018000401206en10.4067/S0718-95162018005003302
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Manganese excess barley organic anion exudation antioxidant system
spellingShingle	Manganese excess barley organic anion exudation antioxidant system Millaleo,Rayen Rao,Maria Ulloa-Inostroza,Elizabeth Duran,Paola Mora,Maria de La Luz Early responses to manganese (Mn) excess and its relation to antioxidant performance and organic acid exudation in barley cultivars
description	Abstract: Manganese (Mn) is an essential micronutrient for plants, and is necessary for biochemical and physiological processes. The objective of this research was to determine the early responses to Mn excess and its relation to antioxidant performance mechanisms and organic acid exudation in commercial barley cultivars. We determined early responses to Mn excess in four barley cultivars (Barke, Tatoo, Scarlett, Sebastian), which were subjected to increasing Mn concentrations (2.4-150-350-750-1500 µM Mn), pH 4.8, under nutrient solution during seven days. Results showed that plant growth parameters: biomass, length and relative growth rate (RGR) were negatively altered with the higher Mn treatments. Antioxidant performance such as antioxidant activity (AA) and antioxidant enzymes such as superoxidase dismutase (SOD) were activated in presence of excess Mn. Oxalate was the major organic acid roots exudate, and the cultivar Sebastian had the highest oxalate exudation. In conclusion, Tatoo and Sebastian are proposed as the most Mn tolerant cutvars given that the biomass parameters were not affected by increasing Mn doses, showing major oxalate exudation. It is suggested that the mechanisms associated to Mn alleviation could be attributed to SOD, AA and organic acid production, mainly oxalate, in tolerant cultivars (Sebastian, Tatoo) together to significant decrease of total phenols (TP) in shoot of sensitive cultivars (Barke and Scarlett). Non-enzymatic barriers were not related to early responses, and an enzymatic barrier and oxalate exudation were considered as early indicators of Mn stress, projecting that the tolerance of Mn-tolerant cultivars could increase under field conditions.
author	Millaleo,Rayen Rao,Maria Ulloa-Inostroza,Elizabeth Duran,Paola Mora,Maria de La Luz
author_facet	Millaleo,Rayen Rao,Maria Ulloa-Inostroza,Elizabeth Duran,Paola Mora,Maria de La Luz
author_sort	Millaleo,Rayen
title	Early responses to manganese (Mn) excess and its relation to antioxidant performance and organic acid exudation in barley cultivars
title_short	Early responses to manganese (Mn) excess and its relation to antioxidant performance and organic acid exudation in barley cultivars
title_full	Early responses to manganese (Mn) excess and its relation to antioxidant performance and organic acid exudation in barley cultivars
title_fullStr	Early responses to manganese (Mn) excess and its relation to antioxidant performance and organic acid exudation in barley cultivars
title_full_unstemmed	Early responses to manganese (Mn) excess and its relation to antioxidant performance and organic acid exudation in barley cultivars
title_sort	early responses to manganese (mn) excess and its relation to antioxidant performance and organic acid exudation in barley cultivars
publisher	Chilean Society of Soil Science / Sociedad Chilena de la Ciencia del Suelo
publishDate	2018
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-95162018000401206
work_keys_str_mv	AT millaleorayen earlyresponsestomanganesemnexcessanditsrelationtoantioxidantperformanceandorganicacidexudationinbarleycultivars AT raomaria earlyresponsestomanganesemnexcessanditsrelationtoantioxidantperformanceandorganicacidexudationinbarleycultivars AT ulloainostrozaelizabeth earlyresponsestomanganesemnexcessanditsrelationtoantioxidantperformanceandorganicacidexudationinbarleycultivars AT duranpaola earlyresponsestomanganesemnexcessanditsrelationtoantioxidantperformanceandorganicacidexudationinbarleycultivars AT moramariadelaluz earlyresponsestomanganesemnexcessanditsrelationtoantioxidantperformanceandorganicacidexudationinbarleycultivars
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Early responses to manganese (Mn) excess and its relation to antioxidant performance and organic acid exudation in barley cultivars

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