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https://hdl.handle.net/2440/56764
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Type: | Journal article |
Title: | Arbuscular mycorrhizal colonization reduces arsenate uptake in barley via downregulation of transporters in the direct epidermal phosphate uptake pathway |
Author: | Christophersen, H. Smith, F. Smith, S. |
Citation: | New Phytologist, 2009; 184(4):962-974 |
Publisher: | Blackwell Publishing |
Issue Date: | 2009 |
ISSN: | 0028-646X 1469-8137 |
Statement of Responsibility: | H. M. Christophersen, F. A. Smith and S. E. Smith |
Abstract: | *Here, we used barley (Hordeum vulgare) grown in normal and compartmented pots to investigate sensitivity to arsenic (As) in the absence of a positive growth response to arbuscular mycorrhizas (AM). *We tested the hypothesis that upon inoculation with AM fungi downregulation of HvPht1;1 and HvPht1;2 genes (encoding high-affinity inorganic orthophosphate (P(i))-uptake systems in a direct pathway via root epidermis and root hairs) and upregulation of the AM-induced HvPht1;8 (encoding the P(i)-uptake system responsible for transfer of P(i) from the symbiotic interface to cortical cells) play a role in decreased As uptake and hence reduced As sensitivity in AM plants. *Barley did not respond, or responded negatively to colonization by Glomus intraradices in terms of growth. In terms of specific phosphorus (P) uptake (P uptake per g of root) barley was nonresponsive. There was a significant interaction between As treatment and colonization, resulting in a lower As concentration and uptake in AM compared with nonmycorrhizal (NM) plants. *The decreased uptake of As and higher P : As molar ratios in the AM barley can be explained by the operation of the AM pathway as indicated by induction of HvPht1;8 and by down-regulation of HvPht1;1 and HvPht1;2. |
Keywords: | arsenate barley (Hordeum vulgare) mycorrhizal fungi Glomus intraradices phosphate transporter gene expression |
Rights: | © The Author [2009]. Published by Oxford University Press on behalf of ERA-EDTA. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org |
DOI: | 10.1111/j.1469-8137.2009.03009.x |
Grant ID: | http://purl.org/au-research/grants/arc/DP0662916 |
Published version: | http://dx.doi.org/10.1111/j.1469-8137.2009.03009.x |
Appears in Collections: | Aurora harvest 5 Soil and Land Systems publications |
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