Diaz Céline, Purdy Sarah, Christ Aurélie, Morot-Gaudry Jean-Francois, Wingler Astrid, Masclaux-Daubresse Céline
Unité de Nutrition Azotée des Plantes, Institut National de la Recherche Agronomique, 78 026 Versailles cedex, France.
Plant Physiol. 2005 Jun;138(2):898-908. doi: 10.1104/pp.105.060764. Epub 2005 May 27.
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.
本文描述了根据拟南芥不同重组自交系（RIL）的遗传背景对叶片衰老程度的比较。从Bay-0 x Shahdara群体中选择了五个表现出不同叶片衰老表型（从早衰到晚衰）的RIL，以确定代谢标记，从而根据衰老相关的代谢变化来区分拟南芥品系。γ-氨基丁酸、亮氨酸、异亮氨酸、天冬氨酸和谷氨酸的比例与（1）RIL的年龄和（2）衰老表型相关。即使在莲座叶中尚未检测到任何衰老症状之前，甘氨酸/丝氨酸比值就已出现差异。这可作为植物衰老行为的预测指标。令人惊讶的是，晚衰品系似乎比早衰品系更有效地动员谷氨酰胺、天冬酰胺和硫酸盐。分析了叶片衰老与开花时间之间关系的生理基础。
