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Impact of crop load on nitrogen uptake and reserve mobilisation in Vitis vinifera

Abstract : Nitrogen deficit affects both crop production and composition, particularly in crops requiring an optimal fruit N content for aroma development. The adaptation of cultural practices to improve N use efficiency (NUE) (i.e. N uptake, assimilation and partitioning) is a priority for the sustainable production of high-quality crops. A trial was set on potted grapevines (Vitis vinifera L. cv. Chasselas) to investigate the potential of crop limitation (via bunch thinning) to control plant NUE and ultimately fruit N composition at harvest. A large crop load gradient was imposed by bunch thinning (0.5-2.5 kg m(-2)) and N traceability in the plant was realised with an isotope-labelling method (10 atom % N-15 foliar urea). The results indicate that the mobilisation of root reserves plays a major role in the balance of fruit N content. Fertiliser N uptake and assimilation appeared to be strongly stimulated by high-yielding conditions. Fertilisation largely contributed to fulfilling the high fruit N demand while limiting the mobilisation of root reserves under high yield conditions. Plants were able to modulate root N reserve mobilisation and fertiliser N uptake in function of the crop load, thus maintaining a uniform N concentration in fruits. However, the fruit free amino N profile was modified, which potentially altered the fruit aromas. These findings highlight the great capacity of plants to adapt their N metabolism to constraints, crop thinning in this case. This confirms the possibility of monitoring NUE by adapting cultural practices.
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Déposant : Marion Desailly <>
Soumis le : mercredi 22 juillet 2020 - 11:30:13
Dernière modification le : jeudi 23 juillet 2020 - 03:16:35

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Thibaut Verdenal, Jorge Spangenberg, Vivian Zufferey, Ágnes Dienes-Nagy, Olivier Viret, et al.. Impact of crop load on nitrogen uptake and reserve mobilisation in Vitis vinifera. Functional Plant Biology, CSIRO Publishing, 2020, 47 (8), pp.744-756. ⟨10.1071/FP20010⟩. ⟨hal-02904483⟩

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