Manganese toxicity in barley is controlled by solution manganese and soil manganese speciation

Hernandez-Soriano, Maria C., Degryse, Fien, Lombi, Enzo and Smolders, Erik (2012) Manganese toxicity in barley is controlled by solution manganese and soil manganese speciation. Soil Science Society of America Journal, 76 2: 399-407. doi:10.2136/sssaj2011.0193


Author Hernandez-Soriano, Maria C.
Degryse, Fien
Lombi, Enzo
Smolders, Erik
Title Manganese toxicity in barley is controlled by solution manganese and soil manganese speciation
Journal name Soil Science Society of America Journal   Check publisher's open access policy
ISSN 0361-5995
1435-0661
Publication date 2012-03-01
Year available 2012
Sub-type Article (original research)
DOI 10.2136/sssaj2011.0193
Volume 76
Issue 2
Start page 399
End page 407
Total pages 9
Place of publication Madison, WI, United States
Publisher Soil Science Society of America
Language eng
Formatted abstract
It is well established that Mn toxicity to crops may occur in acid soils and under waterlogging, but there is little information on toxic thresholds in soils. This study was set-up to derive toxic thresholds for plant growth in soils and to relate toxicity of Mn to the Mn speciation in soils. Toxicity of Mn to barley (Hordeum vulgare L.) was assessed for three soils (pH 4.7–6.7) freshly amended with Mn(II) salt using root elongation and plant growth tests. A 50% yield reduction occurred at a shoot concentration of 3500 mg kg–1, which was reached at a soil solution concentration of 360 mg Mn L−1 or a total Mn concentration in soil between 500 (low pH) and 2500 mg kg−1 (high pH soil). Waterlogging of the soil during plant growth marginally increased Mn uptake in the high pH soil but did not have a significant effect on the total soil Mn-based toxicity thresholds. X-ray absorption near-edge structure spectroscopy (XANES) spectra were collected for unamended soils and for soils amended with MnCl2 near the 50% inhibition dose. The soils were incubated either at field capacity or were waterlogged for 7 d or 2 mo with or without addition of organic matter. Waterlogging had no effect on Mn speciation in the low pH soil (pH 4.7), in which Mn was mainly as Mn(II). In the unamended soils with pH > 6, waterlogging reduced Mn(III/IV) to Mn(II), and increased the solubility of Mn. However, in soils amended with MnCl2, the added Mn remained for a large part as Mn(II), even under aerobic conditions, explaining why waterlogging had little effect on the toxicity of Mn. Addition of hay promoted reduction of Mn(III/IV)) while peat decreased reduction rates. This study showed that Mn toxicity can be related to the solubility of Mn, which is strongly dependent on pH and on kinetically controlled redox reactions.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Non HERDC
School of Agriculture and Food Sciences
 
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Created: Mon, 06 Jan 2014, 14:18:18 EST by Maria Hernandez-soriano on behalf of School of Agriculture and Food Sciences