Characterization of markers to determine the extent and variability of leaf senescence in Arabidopsis. A metabolic profiling approach |
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Authors: | Diaz Céline Purdy Sarah Christ Aurélie Morot-Gaudry Jean-Francois Wingler Astrid Masclaux-Daubresse Céline |
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Institution: | Unité de Nutrition Azotée des Plantes, Institut National de la Recherche Agronomique, 78 026 Versailles cedex, France. |
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Abstract: | Comparison of the extent of leaf senescence depending on the genetic background of different recombinant inbred lines (RILs) of Arabidopsis (Arabidopsis thaliana) is described. Five RILs of the Bay-0 x Shahdara population showing differential leaf senescence phenotypes (from early senescing to late senescing) were selected to determine metabolic markers to discriminate Arabidopsis lines on the basis of senescence-dependent changes in metabolism. The proportion of gamma-aminobutyric acid, leucine, isoleucine, aspartate, and glutamate correlated with (1) the age and (2) the senescence phenotype of the RILs. Differences were observed in the glycine/serine ratio even before any senescence symptoms could be detected in the rosettes. This could be used as predictive indicator for plant senescence behavior. Surprisingly, late-senescing lines appeared to mobilize glutamine, asparagine, and sulfate more efficiently than early-senescing lines. The physiological basis of the relationship between leaf senescence and flowering time was analyzed. |
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