OrangerV1, France, Analysis, bibRecord, 000123

Sucrose importation into laticifers of Hevea brasiliensis, in relation to ethylene stimulation of latex production

Identifieur interne : 000123 ( France/Analysis ); précédent : 000122; suivant : 000124

Sucrose importation into laticifers of Hevea brasiliensis, in relation to ethylene stimulation of latex production

Auteurs : Anas Dusotoit-Coucaud [France] ; Nicole Brunel [France] ; Panida Kongsawadworakul [Thaïlande] ; Unchera Viboonjun [Thaïlande] ; Andr Lacointe [France] ; Jean-Louis Julien [France] ; Herv Chrestin [Thaïlande, France] ; Soulaman Sakr [France]

Source :

Annals of Botany [ 0305-7364 ] ; 2009-09.

RBID : ISTEX:45ED4524329CCB25F0CFFDB1EC5BBAE1C1DC74B1

Abstract

Background and Aims The major economic product of Hevea brasiliensis is a rubber-containing cytoplasm (latex), which flows out of laticifers (latex cells) when the bark is tapped. The latex yield is stimulated by ethylene. Sucrose, the unique precursor of rubber synthesis, must cross the plasma membrane through specific sucrose transporters before being metabolized in the laticifers. The relative importance of sucrose transporters in determining latex yield is unknown. Here, the effects of ethylene (by application of Ethrel) on sucrose transporter gene expression in the inner bark tissues and latex cells of H. brasiliensis are described. Methods Experiments, including cloning sucrose transporters, real time RT-PCR and in situ hybridization, were carried out on virgin (untapped) trees, treated or untreated with the latex yield stimulant Ethrel. Key Results Seven putative full-length cDNAs of sucrose transporters were cloned from a latex-specific cDNA library. These transporters belong to all SUT (sucrose transporter) groups and differ by their basal gene expression in latex and inner soft bark, with a predominance of HbSUT1A and HbSUT1B. Of these sucrose transporters, only HbSUT1A and HbSUT2A were distinctly increased by ethylene. Moreover, this increase was shown to be specific to laticifers and to ethylene application. Conclusion The data and all previous information on sucrose transport show that HbSUT1A and HbSUT2A are related to the increase in sucrose import into laticifers, required for the stimulation of latex yield by ethylene in virgin trees.

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DOI: 10.1093/aob/mcp150

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ISTEX:45ED4524329CCB25F0CFFDB1EC5BBAE1C1DC74B1

Le document en format XML

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<author><name sortKey="Brunel, Nicole" sort="Brunel, Nicole" uniqKey="Brunel N" first="Nicole" last="Brunel">Nicole Brunel</name>
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<front><div type="abstract">Background and Aims The major economic product of Hevea brasiliensis is a rubber-containing cytoplasm (latex), which flows out of laticifers (latex cells) when the bark is tapped. The latex yield is stimulated by ethylene. Sucrose, the unique precursor of rubber synthesis, must cross the plasma membrane through specific sucrose transporters before being metabolized in the laticifers. The relative importance of sucrose transporters in determining latex yield is unknown. Here, the effects of ethylene (by application of Ethrel) on sucrose transporter gene expression in the inner bark tissues and latex cells of H. brasiliensis are described. Methods Experiments, including cloning sucrose transporters, real time RT-PCR and in situ hybridization, were carried out on virgin (untapped) trees, treated or untreated with the latex yield stimulant Ethrel. Key Results Seven putative full-length cDNAs of sucrose transporters were cloned from a latex-specific cDNA library. These transporters belong to all SUT (sucrose transporter) groups and differ by their basal gene expression in latex and inner soft bark, with a predominance of HbSUT1A and HbSUT1B. Of these sucrose transporters, only HbSUT1A and HbSUT2A were distinctly increased by ethylene. Moreover, this increase was shown to be specific to laticifers and to ethylene application. Conclusion The data and all previous information on sucrose transport show that HbSUT1A and HbSUT2A are related to the increase in sucrose import into laticifers, required for the stimulation of latex yield by ethylene in virgin trees.</div>
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Sucrose importation into laticifers of Hevea brasiliensis, in relation to ethylene stimulation of latex production

Sucrose importation into laticifers of Hevea brasiliensis, in relation to ethylene stimulation of latex production

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