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Regulation of Leaf Senescence by NTL9-mediated Osmotic Stress Signaling in Arabidopsis  

Yoon, Hye-Kyung (Molecular Signaling Laboratory, Department of Chemistry, Seoul National University)
Kim, Sang-Gyu (Molecular Signaling Laboratory, Department of Chemistry, Seoul National University)
Kim, Sun-Young (Molecular Signaling Laboratory, Department of Chemistry, Seoul National University)
Park, Chung-Mo (Molecular Signaling Laboratory, Department of Chemistry, Seoul National University)
Publication Information
Molecules and Cells / v.25, no.3, 2008 , pp. 438-445 More about this Journal
Abstract
Leaf senescence is a highly regulated genetic process that constitutes the last stage of plant development and provides adaptive fitness by relocating metabolites from senescing leaves to reproducing seeds. Characterization of various senescence mutants, mostly in Arabidopsis, and genome-wide analyses of gene expression, have identified a wide array of regulatory components, including transcription factors and enzymes as well as signaling molecules mediating growth hormones and environmental stress responses. In this work we demonstrate that a membrane-associated NAC transcription factor, NTL9, mediates osmotic stress signaling in leaf senescence. The NTL9 gene is induced by osmotic stress. Furthermore, activation of the dormant, membrane-associated NTL9 is elevated under the same conditions. A series of senescence-associated genes (SAGs) were upregulated in transgenic plants overexpressing an activated form of NTL9, and some of them were slightly but reproducibly downregulated in a T-DNA insertional NTL9 knockout mutant. These observations indicate that NTL9 mediates osmotic stress responses that affect leaf senescence, providing a genetic link between intrinsic genetic programs and external signals in the control of leaf senescence.
Keywords
Abiotic Stress; Arabidopsis thaliana; Leaf Senescence; NAC; NTL9;
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Times Cited By KSCI : 1  (Citation Analysis)
Times Cited By Web Of Science : 15  (Related Records In Web of Science)
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