PMID: 9159182May 27, 1997Paper

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

Proceedings of the National Academy of Sciences of the United States of America
J K RoseA B Bennett

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 modu...Continue Reading

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Citations

Apr 16, 2013·Plant Molecular Biology·Nigel E GapperJames J Giovannoni
Apr 1, 2009·Physiology and Molecular Biology of Plants : an International Journal of Functional Plant Biology·Anurag PayasiRandhir Singh
Nov 13, 2003·Current Opinion in Plant Biology·Yi LiSimon McQueen-Mason
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Mar 11, 2004·The Plant Cell·James J Giovannoni

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