The DOI matches its Crossref record; 31 of the 31 references it cites were found in a registry or an index.
An Aluminum-Activated Citrate Transporter in Barley
Abstract
Soluble ionic aluminum (Al) inhibits root growth and reduces crop production on acid soils. Al-resistant cultivars of barley (Hordeum vulgare L.) detoxify Al by secreting citrate from the roots, but the responsible gene has not been identified yet. Here, we identified a gene (HvAACT1) responsible for the Al-activated citrate secretion by fine mapping combined with microarray analysis, using an Al-resistant cultivar, Murasakimochi, and an Al-sensitive cultivar, Morex. This gene belongs to the multidrug and toxic compound extrusion (MATE) family and was constitutively expressed mainly in the roots of the Al-resistant barley cultivar. Heterologous expression of HvAACT1 in Xenopus oocytes showed efflux activity for (14)C-labeled citrate, but not for malate. Two-electrode voltage clamp analysis also showed transport activity of citrate in the HvAACT1-expressing oocytes in the presence of Al. Overexpression of this gene in tobacco enhanced citrate secretion and Al resistance compared with the wild-type plants. Transiently expressed green fluorescent protein-tagged HvAACT1 was localized at the plasma membrane of the onion epidermal cells, and immunostaining showed that HvAACT1 was localized in the epidermal cells of the barley root tips. A good correlation was found between the expression of HvAACT1 and citrate secretion in 10 barley cultivars differing in Al resistance. Taken together, our results demonstrate that HvAACT1 is an Al-activated citrate transporter responsible for Al resistance in barley.
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Cited by
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Using membrane transporters to improve crops for sustainable food production
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Metadata
- Authors
- Furukawa, J., Yamaji, N., Wang, H., Mitani, N., Murata, Y., Sato, K., Katsuhara, M., Takeda, K., & Ma, J. F.
- Venue
- Plant and Cell Physiology
- Publisher
- Oxford University Press (OUP)
- Published
- 2007-08
- Volume
- 48
- Issue
- 8
- Pages
- 1081-1091
- ISSN
- 0032-0781 (ISSN-L)
- 1471-9053
- OpenAlex
- W2135418798
- Cited by
- 526
- References
- 31
- FWCI
- 31.96
- Type
- journal article
- Language
- en
- Open access
- closed
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- Furukawa, J., Yamaji, N., Wang, H., Mitani, N., Murata, Y., Sato, K., Katsuhara, M., Takeda, K., & Ma, J. F. (2007). An Aluminum-Activated Citrate Transporter in Barley. Plant and Cell Physiology. https://doi.org/10.1093/pcp/pcm091
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