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PLANT PHYSIOLOGY , Vol 113, Issue 4 1303-1308, Copyright © 1997 by American Society of Plant Biologists
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GENE REGULATION AND MOLECULAR GENETICS |
Three Different Polygalacturonases Are Expressed in Tomato Leaf and Flower Abscission, Each with a Different Temporal Expression Pattern
P. Kalaitzis, T. Solomos and M. L. Tucker
Plant Molecular Biology Laboratory, United States Department of Agriculture, Agriculture Research Service, Building 006, BARC-West, Beltsville, Maryland 20705 (P.K., M.L.T.)
Abscission, or organ separation, is accompanied by a marked increase in
hydrolases, which are responsible for the degradation of the middle lamella
and the loosening of the primary cell wall surrounding cells in the
separation layer. We recently reported on the cloning of a tomato
(Lycopersicon esculentum) polygalacturonase (PG) cDNA, TAPG1, expressed
during leaf and flower abscission. In addition to TAPG1, we have cloned two
more PG cDNAs (TAPG2 and TAPG4) that are also expressed during leaf and
flower abscission. The peptide sequences for the three abscission PGs are
relatively similar (76-93% identity) yet different from the those of tomato
fruit PG (38-41% identity). None of the three abscission PG mRNAs are
expressed in fruit, stems, petioles, or anthers of fully open flowers. An
RNase protection assay revealed that all three PGs are expressed in leaf
and flower abscission zones and in pistils of fully open flowers. TAPG4
mRNA is detected much earlier than TAPG1 and TAPG2 mRNA during both leaf
and flower abscission.
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