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Your search keyword '"McKenna, Brigid A."' showing total 5 results
Start Over Author "McKenna, Brigid A." Journal physiologia plantarum
5 results on '"McKenna, Brigid A."'

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

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., and Menzies, Neal W.

Subjects
COWPEA, PHYTOTOXICITY, ROOT growth, WATERLOGGING (Soils), SOIL solubility
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 µ M 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 µ M 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. [ABSTRACT FROM AUTHOR]

Published
2013
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5. Distribution and speciation of Mn in hydrated roots of cowpea at levels inhibiting root growth

Author

Richard I. Webb, Neal W. Menzies, Daryl L. Howard, David L. Paterson, Brigid A. McKenna, Enzo Lombi, Erica Donner, Martin D. de Jonge, Peter M. Kopittke, Peng Wang, F. Pax C. Blamey, Kopittke, Peter M, Lombi, Enzo, McKenna, Brigid A, Wang, Peng, Donner, Erica Nicole Stuart, Webb, Richard I, Blamey, F Pax C, de Jonge, Martin D, Paterson, David, Howard, Daryl L, and Menzies, Neal W

Subjects
Physiology, media_common.quotation_subject, chemistry.chemical_element, Plant Science, Manganese, Plant Roots, Vigna, Botany, Genetics, Root cap, media_common, biology, Dose-Response Relationship, Drug, Fabaceae, Cell Biology, General Medicine, biology.organism_classification, Speciation, Horticulture, X-Ray Absorption Spectroscopy, chemistry, Microscopy, Fluorescence, Stele, Shoot, Mucigel, Phytotoxicity, Synchrotrons
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. Refereed/Peer-reviewed

Published
2012

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