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Phosphorus uptake and partitioning in two durum wheat cultivars with contrasting biomass allocation as affected by different P supply during grain filling

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Abstract

Aims

Phosphorus (P) export with harvested grains is a key step of the P cycle in agroecosystems. In wheat, the accumulation of P in grains originates from both exogenous and endogenous P sources. We investigated the effects of different post-anthesis P supply on P partitioning and P remobilization in two durum wheat cultivars with contrasting biomass allocation.

Methods

Wheat plants were grown on a complete nutrient solution with sufficient P until anthesis. Thereafter, half of the plants were deprived of P and the other half was maintained on the complete nutrient solution. P uptake, allocation, remobilization, and traits related to yield and grain P were determined.

Results

Modifications of post-anthesis P supply had no effect on grain yield. Grain P concentrations at maturity for deprived P supply ranged from 2.2 to 3.4 mg P g DW− 1. Without P, net P fluxes to grains essentially came from leaves (35%), roots (28%) and stems (17% ). With P, net P fluxes came mainly from post-antheis P uptake.

Conclusions

Our results suggest that when the P nutrition of durum wheat is limited after anthesis, endogenous P remobilization can sustain grain growth with minor yield penalties if the plants are well supplied during vegetative growth.

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Acknowledgments

This work has been carried out with financial support from the French National Institute for Agriculture, Food and Environment (INRAE), Bordeaux Sciences Agro and in the framework of the Cluster of Excellence COTE. We thank Mark Bakker for internal revision and valuable comments on the manuscript. The authors are grateful to Jean-Yves Cornu for his help in the experimental set-up and to Sylvie Milin for plant chemical analyses.

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Correspondence to Mohamed El Mazlouzi.

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El Mazlouzi, M., Morel, C., Robert, T. et al. Phosphorus uptake and partitioning in two durum wheat cultivars with contrasting biomass allocation as affected by different P supply during grain filling. Plant Soil 449, 179–192 (2020). https://doi.org/10.1007/s11104-020-04444-0

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  • DOI: https://doi.org/10.1007/s11104-020-04444-0

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