Silicon increases phosphorus (P) uptake by wheat under low P acid soil conditions

Background and aims Although silicon (Si) is known to improve plant growth under low phosphorus (P) conditions, the in planta mechanisms responsible for this effect are still unknown. Here, we investigated the role of Si on P uptake along with the expression of Pi transporters in wheat (Triticum aes...

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Bibliographic Details
Published in:Plant and soil 2017-10, Vol.419 (1/2), p.447-455
Main Authors: Kostic, Ljiljana, Nikolic, Nina, Bosnic, Dragana, Samardzic, Jelena, Nikolic, Miroslav
Format: Article
Language:English
Subjects:
Acidic soils
Aluminum
Biomedical and Life Sciences
Botanical research
Citric acid
Ecology
Environmental aspects
Exudation
Fertilization
Gene expression
Life Sciences
Liming
Malate
Organic acids
pH effects
Phosphorus
Phosphorus (Chemical element)
Plant growth
Plant Physiology
Plant Sciences
Regular Article
Rhizosphere
Silicon
Soil acidity
Soil analysis
Soil chemistry
Soil conditions
Soil pH
Soil Science & Conservation
Soils
Triticum aestivum
Wheat
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Summary:Background and aims Although silicon (Si) is known to improve plant growth under low phosphorus (P) conditions, the in planta mechanisms responsible for this effect are still unknown. Here, we investigated the role of Si on P uptake along with the expression of Pi transporters in wheat (Triticum aestivum L.) grown in low P acid soil in comparison with P fertilization and liming. Methods A combined approach was performed including analyses of rhizosphere soil, tissue P content, the expression of the root Pi transporter genes (TaPHT1.1 and TaPHT1.2), and the root exudation of citrate and malate. Results Supply of Si in a form of Na2SiO3 increased shoot P concentration to an adequate level in the range of P-fertilized plants. Silicon ameliorated low soil pH and high Al3+ comparable to the effect of liming. The in planta effect of Si on up-regulating the expression of TaPHT1.1 and TaPHT1.2 was several fold higher and consequently P uptake doubled compared to both P fertilization and liming. In addition, Si directly stimulated root Pi acquisition by prominently increasing both malate and citrate exudation rate. Conclusions Application of Si increased root exudation of organic acids that mobilize Pi in the rhizosphere and up-regulated Pi transporters in wheat roots.
ISSN:0032-079X
1573-5036
DOI:10.1007/s11104-017-3364-0