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Overexpressing AtPAP15 enhances phosphorus efficiency in soybean
Xiurong Wang1, Yingxiang Wang, Jiang Tian
1Root Biology Center, South China Agricultural University, Guangzhou 510642, China.
Plant Physiology
|July 10, 2009
Summary
Genetically engineered soybean with an enhanced acid phosphatase (APase) gene shows improved phosphorus (P) uptake and increased crop yields, especially in low-P soils. This innovation offers a promising solution for global agriculture facing P availability challenges.
Area of Science:
- Plant Biotechnology
- Agricultural Science
- Biochemistry
Background:
- Low phosphorus (P) availability severely limits crop production globally.
- Organic phosphate constitutes a large soil P pool, inaccessible to plants without hydrolysis.
- Enhancing acid phosphatase (APase) activity is a strategy to improve plant P nutrition from organic sources.
Purpose of the Study:
- To improve phosphorus (P) use efficiency in soybean (Glycine max) by overexpressing a plant acid phosphatase (APase) gene.
- To assess the impact of AtPAP15 gene expression on soybean growth, P content, and yield in low-P conditions.
Main Methods:
- Overexpression of an Arabidopsis purple APase gene (AtPAP15) with a carrot extracellular targeting peptide in soybean hairy roots.
- Transformation of soybean plants with the AtPAP15 gene.
- Analysis of APase and phytase activity, plant dry weight, P content, and yield in transgenic soybean lines grown in sand culture and acid soils.
Main Results:
- Transgenic soybean lines overexpressing AtPAP15 showed a 1.5-fold increase in APase activity in hairy roots.
- Significant improvements in P efficiency were observed, including increased plant dry weight (up to 117.8%) and P content (up to 90.1%) in transgenic plants.
- Transgenic soybean lines exhibited enhanced yields on acid soils, with notable increases in pod number (up to 59.0%) and seed number (up to 66.7%).
Conclusions:
- Constitutive expression of the AtPAP15 gene successfully enhances phosphorus (P) efficiency and yield in soybean.
- This study presents the first report of improving soybean P efficiency through the expression of a plant APase gene.
- The findings hold significant potential for improving crop yields in phosphorus-deficient agricultural soils worldwide.
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