منابع مشابه
Rhizobial Nodulation Genes nodIJ
Although many aand some b-proteobacterial species are symbiotic with legumes, the evolutionary origin of nitrogenfixing nodulation remains unclear. We examined aand b-proteobacteria whose genomes were sequenced using largescale phylogenetic profiling and revealed the evolutionary origin of two nodulation genes. These genes, nodI and nodJ (nodIJ), play key roles in the secretion of Nod factors, ...
متن کاملMedicago LYK3, an entry receptor in rhizobial nodulation factor signaling.
Rhizobia secrete nodulation (Nod) factors, which set in motion the formation of nitrogen-fixing root nodules on legume host plants. Nod factors induce several cellular responses in root hair cells within minutes, but also are essential for the formation of infection threads by which rhizobia enter the root. Based on studies using bacterial mutants, a two-receptor model was proposed, a signaling...
متن کاملNon-rhizobial nodulation in legumes
Legume Rhizobium associations are undoubtedly form the most important N2-fixing symbiosis and play a subtle role in contributing nitrogen and maintaining/improving soil fertility. A great diversity in the rhizobial species nodulating legumes has been recognized, which belongs to α subgroup of proteobacteria covering the genera, Rhizobium, Sinorhizobium (renamed as Ensifer), Mesorhizobium, Brady...
متن کاملRhizobial lipopolysaccharide as the receptor in lectin-Rhizobium interaction.
Rhizobial specificity was examined on the basis of interaction between legume lectins (peanut, pea and soybean) and different rhizobial species (various bradyrhizobia specific for peanut, P 14-93 and SB16). Legume lectins showed higher affinity towards host-specific Rhizobium and lipopolysaccharides (LPS) isolated from those particular rhizobia. Two LPS mutants of peanut-specific Bradyrhizobium...
متن کاملThe nodulation factor hydrolase of Medicago truncatula: characterization of an enzyme specifically cleaving rhizobial nodulation signals.
Nodule formation induced by nitrogen-fixing rhizobia depends on bacterial nodulation factors (NFs), modified chitin oligosaccharides with a fatty acid moiety. Certain NFs can be cleaved and inactivated by plant chitinases. However, the most abundant NF of Sinorhizobium meliloti, an O-acetylated and sulfated tetramer, is resistant to hydrolysis by all plant chitinases tested so far. Nevertheless...
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ژورنال
عنوان ژورنال: Genome Biology
سال: 2000
ISSN: 1474-760X
DOI: 10.1186/gb-2000-1-1-reports007