Rhizobia modulate root-hair-specific expression of extensin genes

Molecular Plant-microbe Interactions : MPMI
I Arsenijević-MaksimovićA Krause

Abstract

Three cDNAs (ext3, ext127, and ext26), originally isolated by differential screening from a root-hair cDNA library of Vigna unguiculata, were found to encode extensin-like cell wall proteins. Transcripts homologous to these cDNAs were only detected in root hairs where mRNA levels decreased 1 day after inoculation with rhizobia. This coincided with the onset of root-hair deformation, the first morphological step in the Rhizobium-legume interaction. Decreases in transcript levels following inoculation with wild-type Rhizobium sp. NGR234 were more pronounced than with NGR delta nodABC, a mutant deficient in Nod-factor production. Inoculation with a rhizobial strain carrying a mutation in a gene encoding a transcriptional activator for nod genes (NGR delta nodD1) did not repress mRNA levels, indicating that a second nodulation signal may be present that is nodD dependent. Application of purified NodNGR factors only affected transcript levels of ext3. The genomic locus of the gene homologous to ext26 (Ext26G) was cloned. In the 5' flanking region, several potential TATA boxes and CAP signals were identified. Part of the promoter region shares homology with the Pisum sativum seed lectin promoter and the Nicotiana tabacum nitrate redu...Continue Reading

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Citations

Jan 5, 2001·Phytochemistry·J B FrueaufM J Kieliszewski
Apr 3, 1999·Molecular Plant-microbe Interactions : MPMI·S G Pueppke, W J Broughton
Jan 5, 2002·Molecular Plant-microbe Interactions : MPMI·K NucR Słomski
May 25, 2002·Molecular Plant-microbe Interactions : MPMI·Elizabeth A RathbunNicholas J Brewin
Mar 14, 2002·Plant Physiology·Marcel BucherJörg W Riesmeier
Feb 3, 1999·Annual Review of Genetics·M Schultze, A Kondorosi
Sep 6, 2001·Proceedings of the National Academy of Sciences of the United States of America·R F DittL Comai
Jul 29, 1998·Molecular Microbiology·V VipreyX Perret
Oct 31, 2002·Critical Reviews in Biotechnology·Moul Dey, Swapan K Datta

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