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E-Letters

Editors' Choice:
Rhizobial Receptors Revealed
(14 October 2003)
Sci. STKE 2003 (204), tw404-tw404. [DOI: 10.1126/stke.2003.204.tw404]
Abstract »  
Posted E-Letters:

Correction of Typographical Errors

A Correction to the Editor's Choice Summary Titled: "Rhizobial Receptors Revealed."

Throughout the text, the gene names were misspelled as "nrf1" and "nrf5." They should be spelled "nfr1" and "nfr5." The corrected text should read as follows:

Two groups report the identification of the long-sought receptor for the recognition of the Nod factor responsible for initiating communication between symbiotic bacteria rhizobia and plant roots. Establishment of this symbiotic relationship allows legumes to develop nitrogen-fixing root nodules (see Parniske and Downie). Madsen et al. cloned the gene responsible for the nfr5 Lotus japonicus mutant phenotype and determined that the gene encoded a LysM-type serine-threonine receptor kinase. LysM domains are found in other peptidoglycan-binding proteins and chitinases, consistent with NFR5 serving as a receptor for Nod factor, which is a lipochitin-oligosaccharide. Radutoiu et al. characterized the nfr1 and nfr5 mutants, which encode members of the LysM receptor kinase family. Neither nfr1 nor nfr5 mutants exhibited root hair ballooning, membrane depolarization, or extracellular alkalinization in response to application of purified Nod factor. Roots, not nodules, expressed both NFR1 and NFR5. Double-mutant studies indicated that NFR1 and NFR5 were upstream in the nod-signaling pathway from the receptor kinase SYMRK (symbiosis receptor-like kinase), which is involved in the response to both nitrogen-fixing bacteria and phosphate-fixing fungi (mycorrhizal fungi).



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