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A wheat gene encoding an aluminum-activated malate transporter.
Takayuki Sasaki1, Yoko Yamamoto, Bunichi Ezaki
1Research Institute for Bioresources, Okayama University, Chuo 2-20-1, Kurashiki, Okayama 710-0046, Japan.
The Plant Journal : for Cell and Molecular Biology
|February 12, 2004
Summary
Wheat plants can tolerate toxic aluminum in acid soils thanks to the ALMT1 gene. This gene enables aluminum-activated malate transporter activity, which protects roots from aluminum damage and enhances plant growth.
Area of Science:
- Plant Biology
- Genetics
- Biochemistry
Background:
- Acid soils pose a significant challenge to plant growth due to toxic aluminum (Al) cations inhibiting root elongation.
- Some wheat cultivars exhibit enhanced Al tolerance linked to the Al-dependent efflux of malate from root apices.
- Malate forms a stable, harmless complex with Al, forming the basis of a hypothesis for Al tolerance in wheat.
Purpose of the Study:
- To clone and characterize the wheat gene responsible for Al tolerance.
- To investigate the role of the identified gene in Al-activated malate efflux and Al tolerance.
Main Methods:
- Cloning of the ALMT1 gene from wheat.
- Co-segregation analysis with Al tolerance in wheat populations.
- Expression analysis of ALMT1 in Al-tolerant and Al-sensitive lines.
- Heterologous expression of ALMT1 in Xenopus oocytes, rice, and tobacco cells.
Main Results:
- The wheat gene ALMT1 was cloned and co-segregated with Al tolerance.
- ALMT1 encodes a membrane protein constitutively expressed at higher levels in Al-tolerant wheat root apices.
- Heterologous expression of ALMT1 conferred Al-activated malate efflux and increased Al tolerance in tobacco cells.
Conclusions:
- ALMT1 encodes an Al-activated malate transporter.
- This transporter plays a crucial role in conferring Al tolerance to plant cells.
- The findings provide a molecular basis for understanding and potentially improving Al tolerance in crops.