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Plant and Cell Physiology Advance Access published online on August 3, 2006
Plant and Cell Physiology, doi:10.1093/pcp/pcj092
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© The Japanese Society of Plant Physiologists (JSPP); all rights reserved.
Received May 19, 2006
Accepted July 21, 2006

Regular Paper

The female-specific Cs-ACS1G gene of cucumber - A case of gene duplication and recombination between the non sex-specific 1-aminocyclopropane-1-carboxylate synthase gene and a branched-chain amino acid transaminase gene

Ronit Knopf Knopf 1 and Trebitsh Tova 1 *

1 Department of Life Sciences, Ben-Gurion University of the Negev, P.O.B. 653, Beer-Sheva 85105, Israel

* To whom correspondence should be addressed.
Trebitsh Tova, E-mail: trebitsh{at}bgu.ac.il


  Abstract

Cucumber (Cucumis sativus L.) is a monoecious plant in which female sex expression (gynoecy) is controlled by the Female (F) locus that can be modified by other sex-determining genes as well as by environmental and hormonal factors. As in many other cucurbits, ethylene is the major plant hormone regulating female sex expression. Previously we isolated the Cs-ACS1 (ACS, 1-aminocyclopropane-1-carboxylate synthase) gene that encodes the rate-limiting enzyme in the ethylene biosynthetic pathway. We proposed that Cs-ACS1 is present in a single copy in monoecious (ffMM) plants whereas gynoecious plants (FFMM) contain an additional copy Cs-ACS1G that was mapped to the F locus. To study the origin of Cs-ACS1G we cloned and analyzed both the gynoecious-specific Cs-ACS1G gene and the non sex-specific Cs-ACS1 gene. Our results indicate that Cs-ACS1G is the result of a relatively recent gene duplication and recombination, between Cs-ACS1 and a branched-chain amino acid transaminase (BCAT) gene. Taking into consideration that the Cs-ACS1G gene was mapped to the F locus we propose that this duplication event gave rise to the F locus and to gynoecious cucumber plants. Computer analysis of the 1 kb region upstream of the transcription initiating site revealed several putative cis-acting regulatory elements that can potentially confer the responsiveness of Cs-ACS1G to developmental and hormonal factors and thereby control female sex determination in cucumber. These findings lead us to a model explaining the action of Cs-ACS1 and Cs-ACS1G in cucumber floral sex determination.

Keywords: Cucumis sativus; sex determination; ethylene; 1-aminocyclopropane-1-carboxylate synthase; gynoecy; branched-chain amino acid transaminase.
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