Factors Influencing Nodule Occupancy by Inoculant Rhizobia

Vlassak, K.; Vanderleyden, Jozef

doi:10.1080/07352689709701948

Cited by 115 publications

(65 citation statements)

References 572 publications

(484 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In agricultural settings, however, the pairing of crop plants with genetically incongruous soil microbes may set the stage for synthetic symbiotic incompatibilities such as the one we have dissected here. Exploitative rhizobia in these settings tend to outcompete "superior" inoculant strains for nodule occupancy, as has been reported repeatedly (20,21). Our data show how readily a single gene such as hrrP might contribute to the suppression of nitrogen fixation and how the movement of such a gene on a mobile plasmid could corrupt otherwise superior rhizobium inoculants.…”

Section: Discussionmentioning

confidence: 48%

Rhizobial peptidase HrrP cleaves host-encoded signaling peptides and mediates symbiotic compatibility

Price

Tanner

Dillon

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

116

View full text Add to dashboard Cite

Legume-rhizobium pairs are often observed that produce symbiotic root nodules but fail to fix nitrogen. Using the Sinorhizobium meliloti and Medicago truncatula symbiotic system, we previously described several naturally occurring accessory plasmids capable of disrupting the late stages of nodule development while enhancing bacterial proliferation within the nodule. We report here that host range restriction peptidase (hrrP), a gene found on one of these plasmids, is capable of conferring both these properties. hrrP encodes an M16A family metallopeptidase whose catalytic activity is required for these symbiotic effects. The ability of hrrP to suppress nitrogen fixation is conditioned upon the genotypes of both the host plant and the hrrPexpressing rhizobial strain, suggesting its involvement in symbiotic communication. Purified HrrP protein is capable of degrading a range of nodule-specific cysteine-rich (NCR) peptides encoded by M. truncatula. NCR peptides are crucial signals used by M. truncatula for inducing and maintaining rhizobial differentiation within nodules, as demonstrated in the accompanying article [Horváth B, et al. (2015) Proc Natl Acad Sci USA, 10.1073/pnas.1500777112]. The expression pattern of hrrP and its effects on rhizobial morphology are consistent with the NCR peptide cleavage model. This work points to a symbiotic dialogue involving a complex ensemble of host-derived signaling peptides and bacterial modifier enzymes capable of adjusting signal strength, sometimes with exploitative outcomes.symbiosis | nitrogen fixation | metallopeptidase | NCR peptides

show abstract

Section: Discussionmentioning

confidence: 48%

Rhizobial peptidase HrrP cleaves host-encoded signaling peptides and mediates symbiotic compatibility

Price

Tanner

Dillon

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

116

View full text Add to dashboard Cite

show abstract

“…A number of competitiveness-affecting bacterial traits have been identified [67]. Firstly, a direct strainto-strain antagonistic effect was discovered, which manifested itself in bacteriocin production [68][69][70].…”

Section: Changes In Rhizobial Populations Resulting From Competition mentioning

confidence: 99%

Rhizobial communities in symbiosis with legumes: genetic diversity, competition and interactions with host plants

Wielbo

2012

Open Life Sciences

View full text Add to dashboard Cite

AbstractThe term ‘Rhizobium-legume symbiosis’ refers to numerous plant-bacterial interrelationships. Typically, from an evolutionary perspective, these symbioses can be considered as species-to-species interactions, however, such plant-bacterial symbiosis may also be viewed as a low-scale environmental interplay between individual plants and the local microbial population. Rhizobium-legume interactions are therefore highly important in terms of microbial diversity and environmental adaptation thereby shaping the evolution of plant-bacterial symbiotic systems. Herein, the mechanisms underlying and modulating the diversity of rhizobial populations are presented. The roles of several factors impacting successful persistence of strains in rhizobial populations are discussed, shedding light on the complexity of rhizobial-legume interactions.

show abstract

“…Numerous biological traits affecting rhizobial nodulation competitiveness have been described in the literature [16]. They include the ability of rhizobia to utilize specific carbon and energy sources [17,18], the overall metabolic potential of bacteria [19], bacteriocin production, resistance to bacteriocin [20], the susceptibility to plant molecular signals [21,22] and bacterial motility [23].…”

Section: Introductionmentioning

confidence: 99%

The effect of biotic and physical factors on the competitive ability of Rhizobium leguminosarum

et al. 2011

View full text Add to dashboard Cite

show abstract

Factors Influencing Nodule Occupancy by Inoculant Rhizobia

Cited by 115 publications

References 572 publications

Rhizobial peptidase HrrP cleaves host-encoded signaling peptides and mediates symbiotic compatibility

Rhizobial peptidase HrrP cleaves host-encoded signaling peptides and mediates symbiotic compatibility

Rhizobial communities in symbiosis with legumes: genetic diversity, competition and interactions with host plants

The effect of biotic and physical factors on the competitive ability of Rhizobium leguminosarum

Contact Info

Product

Resources

About