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Open AccessArticle

Genotype-Dependent Differences between Cereals in Response to Manganese Excess in the Environment

1
Institute of Biology, Pedagogical University, ul. Podchorążych 2, 31-084 Kraków, Poland
2
Faculty of Biology and Environmental Protection, Nicolaus Copernicus University, ul. Lwowska 1, 87-100 Toruń, Poland
3
Faculty of Chemistry, Jagiellonian University, ul. Gronostajowa 2, 30-387 Kraków, Poland
*
Author to whom correspondence should be addressed.
Agronomy 2020, 10(4), 510; https://doi.org/10.3390/agronomy10040510
Received: 19 March 2020 / Revised: 24 March 2020 / Accepted: 30 March 2020 / Published: 2 April 2020
(This article belongs to the Section Horticultural and Floricultural Crops)
Industrial and agronomic activities lead to oversupply and accumulation of elements in the environment. Relatively little is known about mechanisms of manganese (Mn) triggered stress. In this study, different cultivars of popular cereals wheat, oat, and barley were investigated for their response to excessive Mn. Manganese ions (MnCl2) at 5 and 10 mM were applied to the grains and then to the media on which the plants grew until they developed their first leaf. It was performed ICP MS aiming to understand the mechanism of manganese stress in susceptible and resistant cultivar. Under Mn-stress a decrease in fresh weight of plants was observed, also differences in water content in first leaves, an increase in superoxide dismutases (SOD) and peroxidases (POX) activity, and a significant rise in catalase (CAT) was only characteristic for barley. Increasing Mn concentration resulted in enhancing of manganese superoxide dismutase (Mn-SOD) and copper, zinc superoxide dismutase (Cu/Zn-SOD) bands intensity. The increase in proline content, depending on a balance between pyrroline-5-carboxylate synthase (P5CS), ornithine-d-aminotransferase (OAT), and proline dehydrogenases (PHD) activities, indicated osmotic disorders in all plants and differentiated the studied cereals. Microscopic observations of changes in the structure of plastids and starch accumulation in Mn presence were particularly visible in sensitive cultivars. The study ranked the tested cereals in terms of their tolerance to Mn from the most tolerant wheat through barley and the least tolerant oats. View Full-Text
Keywords: manganese; oxidative stress; osmoprotectants; wheat/barley/oats; enzyme activities manganese; oxidative stress; osmoprotectants; wheat/barley/oats; enzyme activities
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Skórka, M.; Sieprawska, A.; Bednarska-Kozakiewicz, E.; Gawrońska, K.; Kornaś, A.; Telk, A. Genotype-Dependent Differences between Cereals in Response to Manganese Excess in the Environment. Agronomy 2020, 10, 510.

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