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PLANT PHYSIOLOGY , Vol 105, Issue 3 839-846, Copyright © 1994 by American Society of Plant Biologists
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MOLECULAR BIOLOGY AND GENE REGULATION |
Isolation of cDNA Clones for Genes That Are Expressed during Leaf Senescence in Brassica napus (Identification of a Gene Encoding a Senescence-Specific Metallothionein-Like Protein)
V. Buchanan-Wollaston
Plant Molecular Biology Laboratory, Department of Biological Sciences, Wye College, University of London, Wye, Ashford, Kent, TN25 5AH, United Kingdom
cDNA clones representing genes that are expressed during leaf senescence in
Brassica napus were identified by differential screening of a cDNA library
made from RNA isolated from leaves at different stages of senescence. The
expression of these genes at different stages of leaf development was
examined by northern blot analysis, and several different patterns of
expression were observed. One of the clones, LSC54, represented a gene that
is expressed at high levels during leaf senescence. Analysis of this gene
indicated strong expression in flowers as well as in senescing leaves. DNA
sequence analysis of the LSC54 cDNA indicated a similarity between the
deduced amino acid sequence and several metallothionein-like proteins
previously identified in plants.
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