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000046951 1001_ $$0P:(DE-Juel1)VDB32478$$aKlug, Katharina$$b0$$eCorresponding author$$gfemale$$uFZJ
000046951 245__ $$aSystemic effects of mycorrhization on root and shoot physiology of $\textit{Lycopersicon esculentum}$
000046951 260__ $$aJülich$$bForschungszentrum Jülich GmbH Zentralbibliothek, Verlag$$c2006
000046951 300__ $$aIV, 105 S.
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000046951 4900_ $$0PERI:(DE-600)2414988-3$$825734$$aSchriften des Forschungszentrums Jülich. Reihe Umwelt / Environment$$v69
000046951 502__ $$aUniversität Düsseldorf, Diss., 2006$$bDr. (Univ.)$$cUniversität Düsseldorf$$d2006
000046951 500__ $$aRecord converted from JUWEL: 18.07.2013
000046951 500__ $$aRecord converted from VDB: 12.11.2012
000046951 520__ $$aIn a splitroot system, the influence of mycorrhization of tomato plants with the vesiculararbuscular mycorrhizal fungus $\textit{Glomus intraradices}$ on physiology and shikimate pathway transcription was investigated to distinguish between local effects in the mycorrhizal roots and systemic effects in the shoot and in the non-mycorrhizal part of a half-mycorrhizal root. Mycorrhization caused a growth depression and reduced concentrations of elemental carbon and carbohydrates in mycorrhizal and half mycorrhizal roots compared to controls. The two parts of the half mycorrhizal root showed the same low carbon concentration, indicating a systemic effect on carbon availability in the root and the great sink strength of the fungus. Despite, in a developed symbiosis the elevated nitrogen concentration in shoots and roots of mycorrhizal plants, with higher concentrations in the mycorrhizal part of the half mycorrhizal roots, indicated a better supply of mycorrhizal roots and shoots with nutrients, on the cost of nitrogen supply of the non-mycorrhizal part of the root. Although increased nitrogen levels could lead to increased amino acid synthesis, the biosynthesis pathway for the three aromatic amino acids, the shikimate pathway, was not regulated in this later stage of the symbiosis. However, elevated shikimate pathway transcripts in mycorrhizal roots in the early stage of the symbiosis were demonstrated for the first time. This indicates an involvement of the shikimate pathway in early defence responses against the fungus and an influence of changes in carbon status and sugar metabolism on the pathway. A more detailed look to the entry enzyme of the shikimate pathway in plants revealed that one of its two isoforms (DAHPS2) was upregulated by mycorrhization. This one was also induced by short-term ozone exposure, whereas the other was unaffected under the investigated conditions. Furthermore, an influence of mycorrhization on the shoot reaction to ozone was found. Dependent on the mycorrhization rate, an additional treatment with ozone caused additive DAHPS induction of the second isoform in shoots. VOC emissions and glutathione concentrations were only elevated in shoots of non-mycorrhizal plants after ozone exposure, indicating changes in root-shoot interactions involving signalling cascades. Neither early jasmonic acid or hexenal induction nor later methyl-salicylate emissions seem to be relevant in the regulation of DAHPS in response to ozone. Moreover, ozone alone did not only induce the shikimate pathway in shoots, but there was also an isoform specific induction of DAHPS transcripts in roots after ozone treatment, what would require a fast transduction of a shoot signal to the roots. Whether the signalling from shoot to root after ozone exposure is mediated by the same compounds as the root to shoot signalling in the mycorrhizal symbiosis still remains unclear. Furthermore, the different affected pathways and substances may be influenced by different signalling cascades, reflecting the various re-programming in plant metabolism during interactions with belowground symbionts and aboveground environmental parameters.
000046951 536__ $$0G:(DE-Juel1)FUEK407$$2G:(DE-HGF)$$aTerrestrische Umwelt$$cP24$$x0
000046951 540__ $$aNeither this book nor any part of it may be reproduced or transmitted in any form or by any  means, electronic or mechanical, including photocopying, microfilming, and recording, or by any information storage and retrieval  system, without permission in writing from the publisher.
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000046951 9131_ $$0G:(DE-Juel1)FUEK407$$bErde und Umwelt$$kP24$$lTerrestrische Umwelt$$vTerrestrische Umwelt$$x0
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000046951 9201_ $$0I:(DE-Juel1)VDB49$$d31.12.2006$$gICG$$kICG-III$$lPhytosphäre$$x0
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