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First published online April 4, 2002; 10.1105/tpc.010422

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The Plant Cell, Vol. 14, 805-815, April 2002, Copyright © 2002,
American Society of Plant Biologists

A Gene Encoding an Acyl Hydrolase Is Involved in Leaf Senescence in Arabidopsis

Yuehui He1 and Susheng Gan2

Plant Physiology/Biochemistry/Molecular Biology Program, Department of Agronomy, and the Tobacco and Health Research Institute, University of Kentucky, Lexington, Kentucky 40546-0236

2 To whom correspondence should be addressed. E-mail sgan{at}uky.edu; fax 859-323-1077

SAG101, a leaf senescence-associated gene, was cloned from an Arabidopsis leaf senescence enhancer trap line and functionally characterized. Reporter gene and RNA gel blot analyses revealed that SAG101 was not expressed until the onset of senescence in leaves. A recombinant SAG101 fusion protein overexpressed in Escherichia coli displayed acyl hydrolase activity. Antisense RNA interference in transgenic plants delayed the onset of leaf senescence for ~4 days. Chemically induced overexpression of SAG101 caused precocious senescence in both attached and detached leaves of transgenic Arabidopsis plants. These data suggest that SAG101 plays a significant role in leaf senescence.




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