Distribution and speciation of Mn in hydrated roots of cowpea at levels inhibiting root growth

Kopittke, Peter M., Lombi, Enzo, McKenna, Brigid A., Wang, Peng, Donner, Erica, Webb, Richard I., Blamey, F. Pax C., de Jonge, Martin D., Paterson, David, Howard, Daryl L. and Menzies, Neal W. (2013) Distribution and speciation of Mn in hydrated roots of cowpea at levels inhibiting root growth. Physiologia Plantarum, 147 4: 453-464. doi:10.1111/j.1399-3054.2012.01674.x


Author Kopittke, Peter M.
Lombi, Enzo
McKenna, Brigid A.
Wang, Peng
Donner, Erica
Webb, Richard I.
Blamey, F. Pax C.
de Jonge, Martin D.
Paterson, David
Howard, Daryl L.
Menzies, Neal W.
Title Distribution and speciation of Mn in hydrated roots of cowpea at levels inhibiting root growth
Journal name Physiologia Plantarum   Check publisher's open access policy
ISSN 0031-9317
1399-3054
Publication date 2013-04
Year available 2012
Sub-type Article (original research)
DOI 10.1111/j.1399-3054.2012.01674.x
Volume 147
Issue 4
Start page 453
End page 464
Total pages 12
Place of publication Malden, MA, United States
Publisher Wiley-Blackwell
Collection year 2014
Language eng
Abstract The phytotoxicity of Mn is important globally due to its increased solubility in acid or waterlogged soils. Short-term (≤24 h) solution culture studies with 150 μM Mn were conducted to investigate the in situ distribution and speciation of Mn in apical tissues of hydrated roots of cowpea [Vigna unguiculata (L.) Walp. cv. Red Caloona] using synchrotron-based techniques. Accumulation of Mn was rapid; exposure to 150 μM Mn for only 5 min resulting in substantial Mn accumulation in the root cap and associated mucigel. The highest tissue concentrations of Mn were in the root cap, with linear combination fitting of the data suggesting that≥80% of this Mn(II) was associated with citrate. Interestingly, although the primary site of Mn toxicity is typically the shoots, concentrations of Mn in the stele of the root were not noticeably higher than in the surrounding cortical tissues in the short-term (≤24 h). The data provided here from the in situ analyses of hydrated roots exposed to excess Mn are, to our knowledge, the first of this type to be reported for Mn and provide important information regarding plant responses to high Mn in the rooting environment.
Keyword Phytotoxicity
Mn
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article first published online: 13 September 2012.

 
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