Abstract
Soil acidity is a major problem of large areas of arable land on a global scale. Many acid soils are low in plant-available phosphorus (P) or are highly P-fixing, resulting in poor plant growth. In addition, aluminium (Al) is soluble in acid soils in the toxic Al{sup 3+} form, which also reduces plant growth. There is considerable evidence that both P deficiency and exposure to Al{sup 3+} stimulate the efflux of organic acids from roots of a range of species. Organic acids such as citrate, malate and oxalate are able to desorb or solubilise fixed soil P, making it available for plant uptake. Organic acids also chelate Al{sup 3+} to render it non-toxic, and are, therefore, involved in Al tolerance mechanisms. In this review, we discuss the literature on the role of organic acids exuded from roots in improving plant P uptake and Al-tolerance in acid soils. Research is now attempting to understand how P deficiency or exposure to Al{sup 3+} activates or induces organic acid efflux at the molecular level, with the aim of improving P acquisition and Al tolerance by conventional plant breeding and by genetic engineering. At the agronomic level, it is desirable that existing crop and
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Hocking, P J;
Randall, P J;
Delhaize, E;
[1]
Keerthisinghe, G
[2]
- CSIRO Plant Industry, Canberra (Australia)
- International Atomic Energy Agency, Vienna (Austria)
Citation Formats
Hocking, P J, Randall, P J, Delhaize, E, and Keerthisinghe, G.
The role of organic acids exuded from roots in phosphorus nutrition and aluminium tolerance in acidic soils.
IAEA: N. p.,
2000.
Web.
Hocking, P J, Randall, P J, Delhaize, E, & Keerthisinghe, G.
The role of organic acids exuded from roots in phosphorus nutrition and aluminium tolerance in acidic soils.
IAEA.
Hocking, P J, Randall, P J, Delhaize, E, and Keerthisinghe, G.
2000.
"The role of organic acids exuded from roots in phosphorus nutrition and aluminium tolerance in acidic soils."
IAEA.
@misc{etde_20083941,
title = {The role of organic acids exuded from roots in phosphorus nutrition and aluminium tolerance in acidic soils}
author = {Hocking, P J, Randall, P J, Delhaize, E, and Keerthisinghe, G}
abstractNote = {Soil acidity is a major problem of large areas of arable land on a global scale. Many acid soils are low in plant-available phosphorus (P) or are highly P-fixing, resulting in poor plant growth. In addition, aluminium (Al) is soluble in acid soils in the toxic Al{sup 3+} form, which also reduces plant growth. There is considerable evidence that both P deficiency and exposure to Al{sup 3+} stimulate the efflux of organic acids from roots of a range of species. Organic acids such as citrate, malate and oxalate are able to desorb or solubilise fixed soil P, making it available for plant uptake. Organic acids also chelate Al{sup 3+} to render it non-toxic, and are, therefore, involved in Al tolerance mechanisms. In this review, we discuss the literature on the role of organic acids exuded from roots in improving plant P uptake and Al-tolerance in acid soils. Research is now attempting to understand how P deficiency or exposure to Al{sup 3+} activates or induces organic acid efflux at the molecular level, with the aim of improving P acquisition and Al tolerance by conventional plant breeding and by genetic engineering. At the agronomic level, it is desirable that existing crop and pasture plants with enhanced soil-P uptake and tolerance to Al due to organic acid exudation are integrated into farming systems. (author)}
place = {IAEA}
year = {2000}
month = {Jun}
}
title = {The role of organic acids exuded from roots in phosphorus nutrition and aluminium tolerance in acidic soils}
author = {Hocking, P J, Randall, P J, Delhaize, E, and Keerthisinghe, G}
abstractNote = {Soil acidity is a major problem of large areas of arable land on a global scale. Many acid soils are low in plant-available phosphorus (P) or are highly P-fixing, resulting in poor plant growth. In addition, aluminium (Al) is soluble in acid soils in the toxic Al{sup 3+} form, which also reduces plant growth. There is considerable evidence that both P deficiency and exposure to Al{sup 3+} stimulate the efflux of organic acids from roots of a range of species. Organic acids such as citrate, malate and oxalate are able to desorb or solubilise fixed soil P, making it available for plant uptake. Organic acids also chelate Al{sup 3+} to render it non-toxic, and are, therefore, involved in Al tolerance mechanisms. In this review, we discuss the literature on the role of organic acids exuded from roots in improving plant P uptake and Al-tolerance in acid soils. Research is now attempting to understand how P deficiency or exposure to Al{sup 3+} activates or induces organic acid efflux at the molecular level, with the aim of improving P acquisition and Al tolerance by conventional plant breeding and by genetic engineering. At the agronomic level, it is desirable that existing crop and pasture plants with enhanced soil-P uptake and tolerance to Al due to organic acid exudation are integrated into farming systems. (author)}
place = {IAEA}
year = {2000}
month = {Jun}
}