Abstract
Aims
Rainfed rice in subSaharan Africa suffers from combined drought and phosphorus (P) deficiency stresses. Enhanced root development under water stress may counteract the physical effects of drought lowering soil P bioavailability. This study was set up to evaluate how rice genotypes respond differently to variable water stress in P deficient conditions.
Methods
A greenhouse study was conducted with a full factorial combination of six genotypes, two soil P treatments (strong to moderate P deficiency) and two irrigation (W) regimes (rainfed limited and adequate). Plants were grown for 49 days and root traits were measured.
Results
The overall effects of P supply on shoot weight were larger than overall effects of water supply, water stress effects were most pronounced at highest P supply because of the higher transpiration in larger plants. Reduced water supply did not enhance P stress, and the stress antagonisms were genotype dependent. There was no genotypic variation in the increased root development in response to drought that would lead to increased P uptake. Root weight and root efficiency mainly explained shoot P content across all water treatments and genotypes with marginal effects of root architectural traits.
Conclusion
This study illustrates the importance of root biomass production and root efficiency under the combined stresses of water and P and corroborated the superior performance of genotypes Chhomrong Dhan and FOFIFA 172 that was found in the field.
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Data Availability
The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
This work was financed by a C1 project (C16/15/042), funded by KU Leuven. We thank Marie-Paule Razafimanantsoa and all other LRI and KU Leuven staff who assisted in this work. We are grateful to Karlien Cassaert for the assistance in administration.
Funding
This work was supported by KU Leuven (C1 project number C16/15/042).
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Erik Smolders, Roel Merckx, Pieterjan De Bauw, Tovohery Rakotoson, Mieke Verbeeck and Eva Houben contributed to the study conception and design. Material preparation, data collection and analysis were performed by Eva Houben, Mieke Verbeeck and Tovohery Rakotoson. The first draft of the manuscript was written by Mieke Verbeeck and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Verbeeck, M., Houben, E., De Bauw, P. et al. Root biomass explains genotypic differences in phosphorus uptake of rainfed rice subjected to water and phosphorus stresses. Plant Soil 486, 253–271 (2023). https://doi.org/10.1007/s11104-022-05865-9
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DOI: https://doi.org/10.1007/s11104-022-05865-9