Plasmodesmata distribution and sugar partitioning in nitrogen-fixing root nodules of Datisca glomerata |
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Authors: | Maria Schubert Nouria K. Koteyeva Philipp W. Wabnitz Patricia Santos Michael Büttner Norbert Sauer Kirill Demchenko Katharina Pawlowski |
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Affiliation: | 1.Albrecht-von-Haller-Institut für Pflanzenwissenschaften, Biochemie der Pflanze, Georg-August-Universit?t G?ttingen,G?ttingen,Germany;2.Laboratory of Anatomy and Morphology,Komarov Botanical Institute, Russian Academy of Sciences,St. Petersburg,Russia;3.Department of Botany,Stockholm University,Stockholm,Sweden;4.Abteilung für Molekulare Pflanzenphysiologie, Friedrich-Alexander-Universit?t Erlangen-Nürnberg,Erlangen,Germany;5.All-Russia Research Institute for Agricultural Microbiology, Laboratory of Molecular and Cellular Biology,St. Petersburg,Russia |
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Abstract: | To understand carbon partitioning in roots and nodules of Datisca glomerata, activities of sucrose-degrading enzymes and sugar transporter expression patterns were analyzed in both organs, and plasmodesmal connections between nodule cortical cells were examined by transmission electron microscopy. The results indicate that in nodules, the contribution of symplastic transport processes is increased in comparison to roots, specifically in infected cells which develop many secondary plasmodesmata. Invertase activities are dramatically reduced in nodules as compared to roots, indicating that here the main enzyme responsible for the cleavage of sucrose is sucrose synthase. A high-affinity, low-specificity monosaccharide transporter whose expression is induced in infected cells prior to the onset of bacterial nitrogen fixation, and which has an unusually low pH optimum and may be involved in turgor control or hexose retrieval during infection thread growth. |
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