Abstract
Background and aims
Incorporating soybean (Glycine max) genotypes with a high nitrogen fixation potential into cropping systems can sustainably improve the livelihoods of smallholder farmers in Western Kenya. Nitrogen fixation is, however, often constrained by low phosphorus (P) availability. The selection of soybean genotypes for increased P efficiency could help to overcome this problem. This study investigated the contribution of different root traits to variation in P efficiency among soybean genotypes.
Methods
Eight genotypes were grown in a Ferralsol amended with suboptimal (low P) and optimal (high P) amounts of soluble P. Root hair growth was visualized by growing plants in a novel agar system where P intensity was buffered by Al2O3 nanoparticles.
Results
In the pot trial, P uptake was unaffected among the genotypes at high P but differed about 2-fold at low P. The genotypes differed in P uptake efficiency but not in P utilization efficiency. Regression analysis and mechanistic modeling indicated that P uptake efficiencies were to a large extent related to root hair development (length and density) and, to a lower extent, to colonization by mycorrhizal fungi.
Conclusion
Breeding for improved root hair development is a promising way to increase P uptake efficiency in soybean.
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Abbreviations
- AMF:
-
Arbuscular mycorrhizal fungi
- DAP:
-
Days after planting
- IITA:
-
International Institute of Tropical Agriculture
- MP:
-
Maturity period
- TSBF-CIAT:
-
Tropical Soil Biology and Fertility Institute of the International Center for Tropical Agriculture
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Acknowledgments
The authors wish to thank Philip Malala, Magdalene Mutia and Purity Nduku for their valuable help during greenhouse work and Nyawira Lukey for carrying out analyses on mycorrhizal colonization. We are also grateful to the team of the TSBF-CIAT Maseno for their assistance with soil sampling, and to Jan Diels for his expert advice on statistical analysis. Marian Renkens acknowledges a travel grant from the University Development Cooperation of the Flemish Interuniversity Council (VLIR-UDC). Elke Vandamme acknowledges a VLIR-UDC PhD scholarship.
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Vandamme, E., Renkens, M., Pypers, P. et al. Root hairs explain P uptake efficiency of soybean genotypes grown in a P-deficient Ferralsol. Plant Soil 369, 269–282 (2013). https://doi.org/10.1007/s11104-012-1571-2
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DOI: https://doi.org/10.1007/s11104-012-1571-2