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Published on May 8, 2008; 10.1104/pp.108.119040

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Received March 17, 2008
Accepted April 26, 2008

Nitrogen recycling and remobilisation are differentially controlled by leaf senescence and development stage in Arabidopsis thaliana under low nitrogen nutrition

Celine Diaz , Thomas Lemaitre , Aurelie Christ , Marianne Azzopardi , Yusuke Kato , Fumihiko Sato , Jean-Francois Morot-Gaudry , Frederik Le Dily , and Celine Masclaux-Daubresse *

Unite de Nutrition Azotee des Plantes, UR511, INRA, Route de Saint Cyr, F-78000 Versailles, France; Division of Integrated Life Science, Graduate School of Biostudies, Kyoto, 606-8502, Japan; UMR INRA-UCBN, Ecophysiologie Vegetale, Agronomie et Nutritions, Universite de Caen, F-14000 Caen, France

* Corresponding author; email: masclaux{at}versailles.inra.fr.

Five recombinant inbred lines (RIL) of Arabidopsis thaliana, previously selected by Diaz et al. (2005) from the Bay-0 x Shahdara RIL population on the basis of differential leaf senescence phenotypes (from early-senescing to late-senescing) when cultivated under nitrogen limiting conditions, were analyzed in order to monitor metabolic markers related to nitrogen assimilation and nitrogen remobilisation pathways. In each RIL, a decrease of total nitrogen, free amino acid and soluble protein contents with leaf ageing was observed. In parallel, the expression of markers for nitrogen remobilisation such as cytosolic glutamine synthetase, glutamate dehydrogenase and CND41-like protease was increased. This increase occurred earlier and was more rapidly in early-senescing lines than in late senescing lines. We measured the partitioning of 15N between sink and source leaves during the vegetative stage of development using 15N tracing and showed that nitrogen remobilisation from the source leaves to the sink leaves, was more efficient in the early senescing lines. The N-remobilisation rate was correlated with leaf-senescence severity at vegetative stage. Experiments of 15N tracing at reproductive stage showed however that the rate of nitrogen remobilisation from the rosettes to the flowering organs and to the seeds, was similar in early and late senescing lines. At reproductive stage, N-remobilisation efficiency did not depend on senescence phenotypes but was related to the ratio between the biomasses of the sink and the source organs.




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