# Phosphorus partitioning and accumulation in durum wheat plants as affected by post-anthesis phosphorus supply

Mohamed El Mazlouzi, Christian Morel, Thierry Robert, Coralie Chesseron, Alain Mollier

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To cite this version:

Mohamed El Mazlouzi, Christian Morel, Thierry Robert, Coralie Chesseron, Alain Mollier. Phosphorus partitioning and accumulation in durum wheat plants as affected by post-anthesis phosphorus supply. International Phosphorus Workshops, Jul 2019, Zurich, Switzerland. [hal-02198126](https://hal.science/hal-02198126)

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https://hal.science/hal-02198126

Submitted on 2 Jun 2020

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Distributed under a Creative Commons Attribution 4.0 International License
IPW9 ZURICH

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2019

ABSTRACTS
The IPW9 abstracts in this electronic abstract book are sorted as follows:

The **7 keynote lectures**, ordered chronologically according to the program

The **68 oral presentations** in the 14 parallel sessions, ordered chronologically according to the program

The **102 posters**, ordered by theme and within each theme according to the numbered posters list in the program booklet

Presenting authors are indicated in **bold**.

Some abstracts have been edited for style and layout but never in their content, which remains responsibility of the authors.
# Parallel Sessions

2.1 Efficient P use in agroecosystems – P utilization by plants

2.2 Optimizing regional and national P cycles – Governance
# Phosphorus partitioning and accumulation in durum wheat plants as affected by post-anthesis phosphorus supply

Mohamed El Mazlouzi<sup>a,b</sup>, C. Morel<sup>a</sup>, T. Robert<sup>a</sup>, C. Chesseron<sup>a</sup> and A. Mollier<sup>a</sup>

<sup>a</sup> ISPA, Bordeaux Sciences Agro, INRA, France

<sup>b</sup> Université de Bordeaux, France

mohamed.el-mazlouzi@inra.fr

Phosphorus (P) management in cropping systems is an important component to secure future food demand. P export with harvested grain is a key step in P cycle in agroecosystems. To improve P use efficiency, plant P uptake and allocation need to be better understood. In wheat, the accumulation of P in grain can originate from both exogenous and endogenous P sources.

The aim of this study was to investigate the effect of P supply in post-anthesis period on P partitioning and remobilization in two durum wheat varieties, Dakter and Sculptur. Wheat plants were grown in quarter-strength, Pi-sufficient (+P) Hoagland's nutrient solution until anthesis. From anthesis, half of plants were transferred on nutrient solution lacking Pi (-P). A set of control plants was maintained on the complete nutrient solution (+P). P uptake, remobilization, and agronomic traits related to yield and grain P were determined.

Grain yield was affected by P deprivation only for Dakter. Harvest index was not affected by P treatment and ranged from 50% for Dakter to 61% for Sculptur. Throughout grain filling period, P contents increased in both treatments with a significantly higher increase under +P condition. P deprivation treatment resulted in an enhanced remobilization of P from source organs, mainly leaves, roots and stems (35%, 20% and 17% respectively) to the growing grains in both varieties. P harvest index (PHI) of both varieties responded in the same way to P deprivation treatment by a significant increasing in PHI, ranging from 55% in P sufficient supply and 87% in P deprivation treatment. In term of PUE, Sculptur was more efficient in utilizing the absorbed P than Dakter. PUE increased significantly in P deprivation treatment.

Our results suggest that under post-anthesis P deprivation, endogenous P source remobilization can sustain grain growth with minor yield penalties. Thus, optimizing endogenous P remobilization would improve P use efficiency and thereby reduce the need for P fertilization.

Further research will concentrate on determining the relative contribution of exogenous and endogenous P source to grain P using isotope tracer technique.

Keywords: phosphorus, remobilization, grain filling