Record ID No. |
1326 |
Author(s) |
Hohnjec N., Vieweg M. F., Puhler A., Becker A., Kuster H. , 2005 |
Affiliation |
Lehrstuhl fur Genetik, Fakultat fur Biologie, Universitat Bielefeld, D-33615 Bielefeld, Germany. |
Title |
Overlaps in the transcriptional profiles of Medicago truncatula roots inoculated with two different glomus fungi provide insights into the genetic program activated during arbuscular mycorrhiza |
Source. Vol.(no):Page |
Plant Physiology. 137(4): 1283-1301p. |
Categories |
Arbuscular Mycorrhiza |
Subjects |
Genetics |
Host |
Medicago truncatula |
Organism |
Glomus mosseae, G. intraradices |
Country |
Germany, Europe |
Abstracts |
Arbuscular mycorrhiza (AM) is a widespread symbiotic association between plants and fungal microsymbionts that supports plant development under nutrient-limiting and various stress conditions. In this study, we focused on the overlapping genetic program activated by two commonly studied microsymbionts in addition to identifying AM-related genes. We thus applied 16,086 probe microarrays to profile the transcriptome of the model legume Medicago truncatula during interactions with Glomus mosseae and Glomus intraradices and specified a total of 201 plant genes as significantly coinduced at least 2-fold, with more than 160 being reported as AM induced for the first time. Several hundred genes were additionally up-regulated during a sole interaction, indicating that the plant genetic program activated in AM to some extent depends on the colonizing microsymbiont. Genes induced during both interactions specified AM-related nitrate, ion, and sugar transporters, enzymes involved in secondary metabolism, proteases, and Kunitz-type protease inhibitors. Furthermore, coinduced genes encoded receptor kinases and other components of signal transduction pathways as well as AM-induced transcriptional regulators, thus reflecting changes in signaling. By the use of reporter gene expression, we demonstrated that one member of the AM-induced gene family encoding blue copper binding proteins (MtBcp1) was both specifically and strongly up-regulated in arbuscule-containing regions of mycorrhizal roots. A comparison of the AM expression profiles to those of nitrogen-fixing root nodules suggested only a limited overlap between the genetic programs orchestrating root endosymbioses.. |