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Hemoglobin LjGlb1-1 is involved in nodulation and regulates the level of nitric oxide in the Lotus japonicus–Mesorhizobium loti symbiosis

AuthorsFukudome, Mitsutaka; Calvo-Beguería, Laura ; Kado, Tomohiro; Osuki, Ken-ichi; Rubio Luna, María Carmen ; Murakami, Ei-ichi; Nagata, Maki; Kucho, Ken-ichi; Sandal, Niels; Stougaard, Jens; Becana Ausejo, Manuel ; Uchiumi, Toshiki
Lotus japonicus
Mesorhizobium loti
nitric oxide
nitrogen fixation
nodulation mutants
Issue DateJul-2016
PublisherOxford University Press
CitationFukudome M, Calvo-Beguería L, Kado T, Osuki K, Rubio MC, Murakami E, Nagata M, Kucho K, Sandal N, Stougaard J, Becana M, Uchiumi T. Hemoglobin LjGlb1-1 is involved in nodulation and regulates the level of nitric oxide in the Lotus japonicus–Mesorhizobium loti symbiosis. Journal of Experimental Botany 67 (17): 5275-5283 (2016)
AbstractLeghemoglobins transport and deliver O2 to the symbiosomes inside legume nodules and are essential for nitrogen fixation. However, the roles of other hemoglobins (Hbs) in the rhizobia–legume symbiosis are unclear. Several Lotus japonicus mutants affecting LjGlb1-1, a non-symbiotic class 1 Hb, have been used to study the function of this protein in symbiosis. Two TILLING alleles with single amino acid substitutions (A102V and E127K) and a LORE1 null allele with a retrotransposon insertion in the 5′-untranslated region (96642) were selected for phenotyping nodulation. Plants of all three mutant lines showed a decrease in long infection threads and nodules, and an increase in incipient infection threads. About 4h after inoculation, the roots of mutant plants exhibited a greater transient accumulation of nitric oxide (NO) than did the wild-type roots; nevertheless, in vitro NO dioxygenase activities of the wild-type, A102V, and E127K proteins were similar, suggesting that the mutated proteins are not fully functional in vivo. The expression of LjGlb1-1, but not of the other class 1 Hb of L. japonicus (LjGlb1-2), was affected during infection of wild-type roots, further supporting a specific role for LjGlb1-1. In conclusion, the LjGlb1-1 mutants reveal that this protein is required during rhizobial infection and regulates NO levels.
Description36 Pags.- 10 Figs.- 5 Tabls. The definitive version is available at: http://jxb.oxfordjournals.org/
Publisher version (URL)http://dx.doi.org/10.1093/jxb/erw290
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