Plant Physiology Preview
Published on August 26, 2005; 10.1104/pp.105.061457
Received February 16, 2005
Returned for revision June 2, 2005
Accepted June 7, 2005
Organization and Metabolism of Plastids and Mitochondria in Arbuscular Mycorrhizal Roots of Medicago truncatula
Swanhild Lohse , Willibald Schliemann , Christian Ammer , Joachim Kopka , Dieter Strack , and Thomas Fester *
Leibniz-Institut für Pflanzenbiochemie, Abteilung Sekundärstoffwechsel, D-06120 Halle (Saale), Germany
Max-Planck-Institut für Molekulare Pflanzenphysiologie, 14476 Potsdam-Golm, Germany
* Corresponding author; email: tfester{at}ipb-halle.de.
Colonization of root cortical cells by arbuscular mycorrhizal fungi leads to marked cytological changes of plastids and mitochondria. Plastids in particular are forming tubular extensions partially connecting individual organelles in a network-like way. These cytological changes correspond to an increased need for plastid and mitochondrial products during establishment and functioning of the symbiosis. The analysis of metabolite and transcript levels in mycorrhizal and nonmycorrhizal roots from Medicago truncatula revealed concomitant changes regarding a number of metabolic pathways. Our results indicate the activation of the mitochondrial tricarboxylic acid cycle and of plastid biosynthetic pathways producing fatty acids, amino acids, and apocarotenoids. These observations provide a general overview of structural and metabolic changes of plastids and mitochondria during colonization of root cortical cells by arbuscular mycorrhizal fungi.
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