NDLI: Expression of a divergent expansin gene is fruit-specific and ripening-regulated.

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Expression of a divergent expansin gene is fruit-specific and ripening-regulated.

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Expression of a divergent expansin gene is fruit-specific and ripening-regulated.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Lee, H. H. Bennett, A. B. Rose, J. K.
Description	Author Affiliation: Rose JK ( Mann Laboratory, Department of Vegetable Crops, University of California, Davis, CA 95616, USA.);
Abstract	Expansins are proteins that induce extension in isolated plant cell walls in vitro and have been proposed to disrupt noncovalent interactions between hemicellulose and cellulose microfibrils. Because the plant primary cell wall acts as a constraint to cell enlargement, this process may be integral to plant cell expansion, and studies of expansins have focused on their role in growth. We report the identification of an expansin (LeExp1) from tomato that exhibits high levels of mRNA abundance and is specifically expressed in ripening fruit, a developmental period when growth has ceased but when selective disassembly of cell wall components is pronounced. cDNAs closely related to LeExp1 were also identified in ripening melons and strawberries, suggesting that they are a common feature of fruit undergoing rapid softening. Furthermore, the sequence of LeExp1 and its homologs from other ripening fruit define a subclass of expansin genes. Expression of LeExp1 is regulated by ethylene, a hormone known to coordinate and induce ripening in many species. LeExp1 is differentially expressed in the ripening-impaired tomato mutants Nr, rin, and nor, and mRNA abundance appears to be influenced directly by ethylene and by a developmentally modulated transduction pathway. The identification of a ripening-regulated expansin gene in tomato and other fruit suggests that, in addition to their role in facilitating the expansion of plant cells, expansins may also contribute to cell wall disassembly in nongrowing tissues, possibly by enhancing the accessibility of noncovalently bound polymers to endogenous enzymic action.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	11
Volume Number	94
Language	English
Publisher	National Academy of Sciences
Publisher Date	1997-06-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Gene Expression Regulation, Plant Lycopersicon Esculentum Physiology Plant Proteins Biosynthesis Plants Genetics Amino Acid Sequence Cell Wall Metabolism DNA Primers DNA, Complementary Ethylenes Pharmacology Drug Effects Genes, Plant Genetic Variation Molecular Sequence Data Phylogeny Chemistry Polymerase Chain Reaction Restriction Mapping Sequence Homology, Amino Acid Comparative Study Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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