Dependence of seed nitrogen concentration on plant nitrogen availability during the seed filling in pea

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Lhuillier-Soundélé, Annabelle | Munier-Jolain, Nathalie G. | Ney, Bertrand, B.

Edité par CCSD ; Elsevier -

International audience. The final seed nitrogen (N) concentration of the pea (Pisum sativum L.) varies greatly with environment. Thesevariations seem to be related to N availability in the plant. To understand such an effect, the pattern of seed Nconcentration during seed filling was analysed at a given node as the ratio of seed N accumulation rate and seed drymatter accumulation rate. Three experiments were conducted in the field and glasshouse. Pea genotypes ‘Solara’,‘Frisson’ and its non-nodulating mutant ‘P2’ were grown and different treatments were applied to manipulate Navailability during seed filling. Treatments included N supply (addition of N fertiliser), depodding (removal of pods)and defoliation (removal of leaves). Changing the N availability during the seed filling affected the seed N concentrationin all experiments. Seed N concentration increased or decreased when plant N availability was enhanced or reducedrespectively. The response of seed N concentration to N availability was not caused by variations in the seed drymatter accumulation rate, as this rate is fixed at the beginning of the seed filling. Changes in seed N concentrationswere mainly caused by variations in the seed N accumulation rates according to N availability in the plant. Theresults demonstrate that seed N and dry matter accumulations are not similarly controlled during seed filling. Unlikethe seed dry matter accumulation rate, the seed N accumulation rate at a given node can vary with time and dependsmainly on N availability in the plant regardless of genotype. However, seeds seem to have minimal N requirements(approximately 2.6 mg g−1 of N) whatever the genotype.

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