Plant Physiology Preview
Published on June 23, 2006; 10.1104/pp.106.080986
Received March 27, 2006
Returned for revision May 5, 2006
Accepted June 13, 2006
Effects of endogenous salicylic acid on nodulation in the model legumes Lotus japonicus and Medicago truncatula
Gary Stacey *, Crystal Bickley McAlvin , Sung-Yong Kim , José Olivares , and María José Soto
Department of Microbiology, University of Tennessee, Knoxville, TN, USA; National Center for Soybean Biotechnology, Division of Plant Science, University of Missouri, Columbia, MO, USA; Division of Biochemistry and Department of Molecular Microbiology and Immunology, University of Missouri, Columbia, MO, USA
Department of Microbiology, University of Tennessee, Knoxville, TN, USA
National Center for Soybean Biotechnology, Division of Plant Science, University of Missouri, Columbia, MO, USA
Estación Experimental del Zaidin, CSIC, Granada, Spain
* Corresponding author; email: staceyg{at}missouri.edu.
The exogenous addition of salicylic acid (SA) was previously shown to inhibit indeterminate but not determinate-type nodulation. We sought to extend these results by modulating endogenous levels of SA through the transgenic expression of salicylate hydroxylase (NahG) in both stably transformed Lotus japonicus and composite Medicago truncatula plants. NahG expression in L. japonicus resulted in a marked reduction of SA levels. This reduction correlated with an increase in the number of infections and mean nodule number when compared to controls. However, a complicating factor was that NahG expressing plants had greater root growth. Spot inoculations of NahG expressing L. japonicus plants confirmed increased nodulation in these plants. Consistent with the reported inhibitory effects of exogenous SA on indeterminate-type nodulation, NahG expression in M. truncatula plants led to enhanced nodulation and infection. These data point to an important role for SA-mediated plant defense pathways in controlling nodule formation on both determinate and indeterminate nodule-forming hosts.
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