Mutualism variation in the nodulation response to nitrate

Heath, Katy D.; Stock, Amanda J.; Stinchcombe, John R.

doi:10.1111/j.1420-9101.2010.02092.x

Cited by 94 publications

(114 citation statements)

References 45 publications

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“…In particular, plant biomass with the same combination of AMF and rhizobia varied between phosphorus addition treatments. This result is consistent with other studies that find plant response to the effects of nutrient addition on plant-AMF (Vogelsang et al 2006) and plant-rhizobia interactions (Heath et al 2010) is dependent upon host-symbiont combination. Yet we found that nitrogen did not influence the effect of the AMF-rhizobia combination.…”

Section: Abiotic Context Dependency Of Plant-amf-rhizobia Interactionssupporting

confidence: 93%

“…This result conflicts with another study which showed that nodulation of Medicago sativa decreased with AMF infection (Vazquez et al 2001). A recent study by Heath et al (2010) demonstrated that the effects of nitrogen levels on nodulation were variable between M. truncatula and rhizobia genotypes. Our results indicate that AMF colonization can also mediate the effect of nutrient level on nodulation.…”

Section: Competitive or Beneficial Effects Between Amf And Rhizobiacontrasting

confidence: 63%

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Synergism and context dependency of interactions between arbuscular mycorrhizal fungi and rhizobia with a prairie legume

Larimer

Clay

Bever

2014

Ecology

175

109

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Abstract. Biotic interactions play primary roles in major theories of the distribution and abundance of species, yet the nature of these biotic interactions can depend upon the larger ecological community. Leguminous plants, for example, commonly associate with both arbuscular mycorrhizal fungi (AMF) and rhizobia bacteria, and the pairwise interactions may depend upon the presence or identity of the third partner. To determine if the dynamics of plant-AMF and plant-rhizobia interactions are affected by the alternate symbiont, we manipulated the presence and identity of each symbiont, as well as levels of the nutrients supplied by each symbiont (nitrogen and phosphorus), on the growth of prairie legume Amorpha canescens. We found strong synergistic effects of AMF and rhizobia inoculation on plant biomass production that were independent of nutrient levels. AMF and rhizobia responses were each influenced by the other, but not in the same direction. AMF infection increased root nodule number and mass, but rhizobia inoculation decreased AMF hyphal colonization of roots. The relative benefits of each combination of symbionts depended upon phosphorus level. The effect of nitrogen was also contingent on the biotic environment where nitrogen addition decreased nodulation, but this decrease was reduced with coinfection by AMF. Our results demonstrate a strong contingency on the co-occurrence of AMF and rhizobia for the long-term fitness of A. canescens, and suggest that the belowground community is critical for the success of this species in tallgrass prairies.

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Section: Abiotic Context Dependency Of Plant-amf-rhizobia Interactionssupporting

confidence: 93%

Section: Competitive or Beneficial Effects Between Amf And Rhizobiacontrasting

confidence: 63%

Synergism and context dependency of interactions between arbuscular mycorrhizal fungi and rhizobia with a prairie legume

Larimer

Clay

Bever

2014

Ecology

175

109

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“…Since coevolutionary responses on post-infection traits are currently intensely debated [20,22,24,25,59], more data on genetic variation in symbiosisrelated traits (e.g. nodule size [65], energy storage in rhizobia [66]) and post-infection stabilizing traits, as well as the strength of natural selection acting on them, would clarify their role in stabilizing or destabilizing mutualisms [19]. Similarly, identifying trait mismatches between species due to differing coevolutionary histories (cf.…”

Section: Discussionmentioning

confidence: 99%

Standing genetic variation in host preference for mutualist microbial symbionts

Simonsen

Stinchcombe

2014

Proc. R. Soc. B.

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Many models of mutualisms show that mutualisms are unstable if hosts lack mechanisms enabling preferential associations with mutualistic symbiotic partners over exploitative partners. Despite the theoretical importance of mutualism-stabilizing mechanisms, we have little empirical evidence to infer their evolutionary dynamics in response to exploitation by non-beneficial partners. Using a model mutualism-the interaction between legumes and nitrogen-fixing soil symbionts-we tested for quantitative genetic variation in plant responses to mutualistic and exploitative symbiotic rhizobia in controlled greenhouse conditions. We found significant broad-sense heritability in a legume host's preferential association with mutualistic over exploitative symbionts and selection to reduce frequency of associations with exploitative partners. We failed to detect evidence that selection will favour the loss of mutualism-stabilizing mechanisms in the absence of exploitation, as we found no evidence for a fitness cost to the host trait or indirect selection on genetically correlated traits. Our results show that genetic variation in the ability to preferentially reduce associations with an exploitative partner exists within mutualisms and is under selection, indicating that micro-evolutionary responses in mutualism-stabilizing traits in the face of rapidly evolving mutualistic and exploitative symbiotic bacteria can occur in natural host populations.

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“…In legumes, it has been determined that nitrate is involved in the regulation of nodulation (Heath et al 2010;Saito et al 2014). Nitrate transporters are thus likely to have important roles to play during symbiosis establishment.…”

Section: Nitrate Transporters and Their Possible Roles In Rhizobial Smentioning

confidence: 99%

Nitrate transporters: an overview in legumes

Pellizzaro

Alibert

Planchet

et al. 2017

Planta

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Main conclusion The nitrate transporters, belonging to NPF and NRT2 families, play critical roles in nitrate signaling, root growth and nodule development in legumes.Nitrate plays an essential role during plant development as nutrient and also as signal molecule, in both cases working via the activity of nitrate transporters. To date, few studies on NRT2 or NPF nitrate transporters in legumes have been reported, and most of those concern Lotus japonicus and Medicago truncatula. A molecular characterization led to the identification of 4 putative LjNRT2 and 37 putative LjNPF gene sequences in L. japonicus. In M. truncatula, the NRT2 family is composed of 3 putative members. Using the new genome annotation of M. truncatula (Mt4.0), we identified, for this review, 97 putative MtNPF sequences, including 32 new sequences relative to previous studies. Functional characterization has been published for only two MtNPF genes, encoding nitrate transporters of M. truncatula. Both transporters have a role in root system development via abscisic acid signaling: MtNPF6.8 acts as a nitrate sensor during the cell elongation of the primary root, while MtNPF1.7 contributes to the cellular organization of the root tip and nodule formation. An in silico expression study of MtNPF genes confirmed that NPF genes are expressed in nodules, as previously shown for L. japonicus, suggesting a role for the corresponding proteins in nitrate transport, or signal perception in nodules. This review summarizes our knowledge of legume nitrate transporters and discusses new roles for these proteins based on recent discoveries.

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Mutualism variation in the nodulation response to nitrate

Cited by 94 publications

References 45 publications

Synergism and context dependency of interactions between arbuscular mycorrhizal fungi and rhizobia with a prairie legume

Synergism and context dependency of interactions between arbuscular mycorrhizal fungi and rhizobia with a prairie legume

Standing genetic variation in host preference for mutualist microbial symbionts

Nitrate transporters: an overview in legumes

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