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Overexpression of the lemon basil α‐zingiberene synthase gene increases both mono‐ and sesquiterpene contents in tomato fruit

Rachel Davidovich‐Rikanati

Department of Vegetable Crops, Newe Ya’ar Research Center, Agricultural Research Organization, P.O. Box 1021, Ramat Yishay 30095, Israel

Department of Life Sciences, Ben‐Gurion University of the Negev, P.O. Box 653, Beer‐Sheva 84105, Israel

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Efraim Lewinsohn

Department of Vegetable Crops, Newe Ya’ar Research Center, Agricultural Research Organization, P.O. Box 1021, Ramat Yishay 30095, Israel

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Einat Bar

Department of Vegetable Crops, Newe Ya’ar Research Center, Agricultural Research Organization, P.O. Box 1021, Ramat Yishay 30095, Israel

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Yoko Iijima

Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI, USA

Present address: Department of Biotechnology Research, Kazusa DNA Research Institute, 2‐5‐23 Kazusa‐Kamatari, Kisarazu, Chiba 292‐0818, Japan

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Eran Pichersky

Department of Molecular, Cellular and Developmental Biology, University of Michigan, Ann Arbor, MI, USA

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Yaron Sitrit

Corresponding Author

The Jacob Blaustein Institutes for Desert Research, Ben‐Gurion University of the Negev, P.O. Box 653, Beer‐Sheva 84105, Israel

(fax +972 8 6472984; e‐mail

sitrit@bgu.ac.il

).
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First published: 08 October 2008
Cited by: 58

Summary

α‐Zingiberene synthase (ZIS), a sesquiterpene synthase gene that was isolated from lemon basil (Ocimum basilicum L.), encodes an enzyme that catalyzes the formation of α‐zingiberene, and other sesquiterpenes, from farnesyl diphosphate. Transgenic tomato fruits overexpressing ZIS under the control of the fruit ripening‐specific tomato polygalacturonase promoter (PG) accumulated high levels of α‐zingiberene (224–1000 ng g−1 fresh weight) and other sesquiterpenes, such as α‐bergamotene, 7‐epi‐sesquithujene, β‐bisabolene and β‐curcumene, whereas no sesquiterpenes were detected in non‐transformed control fruits. The ZIS‐transgenic fruits also produced monoterpenes, such as α‐thujene, α‐pinene, β‐phellandrene and γ‐terpinene (1–22 ng g−1 fresh weight), which were either not detected or were found only in minute concentrations in control fruits. Recombinant ZIS overexpressed in Escherichia coli catalyzed the formation of these monoterpenes from geranyl diphosphate. As the ZIS protein apparently lacks a transit peptide, and is localized in the cytosol, the production of monoterpenes in the transgenic tomatoes suggests that a pool of geranyl diphosphate is available in the cytosol. The phenotype of the ZIS‐transgenic tomatoes was the same as that for wild‐type tomatoes, with regard to plant vigor and shape, but transgenic plants exhibited a small decrease in lycopene content. This study thus showed that the synthesis of both mono‐ and sesquiterpenes can be enhanced by the ectopic expression of a single transgene in tomato fruit, and it further demonstrated the interconnection between the pools of terpenoid precursors in the plastids and the cytosol.

Number of times cited: 58

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