EL MAZLOUZI, Mohamed; MOREL, Christian; ROBERT, Thierry; YAN, Bofang; MOLLIER, Alain

doi:10.1007/s11104-020-04444-0

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EL MAZLOUZI, Mohamed
Interactions Sol Plante Atmosphère [UMR ISPA]

MOREL, Christian
Interactions Sol Plante Atmosphère [UMR ISPA]

ROBERT, Thierry
Interactions Sol Plante Atmosphère [UMR ISPA]

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Plant and Soil. 2020, vol. 449, p. 179–192

Springer Verlag

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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.< Réduire

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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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