Involvement of autoregulation in the interaction between rhizobial nodulation and AM fungal colonization in soybean roots

Sakamoto, Kazunori; Ogiwara, Natsuko; Kaji, Tomomitsu

doi:10.1007/s00374-013-0804-8

Cited by 27 publications

(21 citation statements)

References 72 publications

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“…A suppression of the other root symbiont by a prior colonization of the root system by AM fungi or rhizobia has also been reported by other authors (Catford et al, ; Catford et al, ; Mortimer et al, ; Sakamoto, Ogiwara, & Kaji, ). It is well established that a prior exposure to rhizobia can limit the subsequent formation of root nodules on the root system (Ferguson et al, ; Foo, Heynen, & Reid, ).…”

Section: Discussionsupporting

confidence: 73%

Nutrient demand and fungal access to resources control the carbon allocation to the symbiotic partners in tripartite interactions of Medicago truncatula

Kafle

Garcia

Wang

et al. 2018

Plant Cell & Environment

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Legumes form tripartite interactions with arbuscular mycorrhizal fungi and rhizobia, and both root symbionts exchange nutrients against carbon from their host. The carbon costs of these interactions are substantial, but our current understanding of how the host controls its carbon allocation to individual root symbionts is limited. We examined nutrient uptake and carbon allocation in tripartite interactions of Medicago truncatula under different nutrient supply conditions, and when the fungal partner had access to nitrogen, and followed the gene expression of several plant transporters of the Sucrose Uptake Transporter (SUT) and Sugars Will Eventually be Exported Transporter (SWEET) family. Tripartite interactions led to synergistic growth responses and stimulated the phosphate and nitrogen uptake of the plant. Plant nutrient demand but also fungal access to nutrients played an important role for the carbon transport to different root symbionts, and the plant allocated more carbon to rhizobia under nitrogen demand, but more carbon to the fungal partner when nitrogen was available. These changes in carbon allocation were consistent with changes in the SUT and SWEET expression. Our study provides important insights into how the host plant controls its carbon allocation under different nutrient supply conditions and changes its carbon allocation to different root symbionts to maximize its symbiotic benefits.

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Section: Discussionsupporting

confidence: 73%

Nutrient demand and fungal access to resources control the carbon allocation to the symbiotic partners in tripartite interactions of Medicago truncatula

Kafle

Garcia

Wang

et al. 2018

Plant Cell & Environment

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“…; Sakamoto et al . ). Within this context, nonadditively expressed genes showing patterns of masking or reversals may also be indicative of conflict or complementarity between mutualists.…”

Section: Discussionmentioning

confidence: 97%

Multiple mutualist effects on genomewide expression in the tripartite association between Medicago truncatula, nitrogen‐fixing bacteria and mycorrhizal fungi

Afkhami

Stinchcombe

2016

Molecular Ecology

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While all species interact with multiple mutualists, the fitness consequences and molecular mechanisms underlying these interactions remain largely unknown. We combined factorial ecological experiments with genomewide expression analyses to examine the phenotypic and transcriptomic responses of model legume Medicago truncatula to rhizobia and mycorrhizal fungi. We found synergistic effects of these mutualists on plant performance and examined unique features of plant gene expression responses to multiple mutualists. There were genomewide signatures of mutualists and multiple mutualists on expression, with partners often affecting unique sets of genes. Mycorrhizal fungi had stronger effects on plant expression than rhizobia, with 70% of differentially expressed genes affected by fungi. Fungal and bacterial mutualists had joint effects on 10% of differentially expressed genes, including unexpected, nonadditive effects on some genes with important functions such as nutrient metabolism. For a subset of genes, interacting with multiple mutualists even led to reversals in the direction of expression (shifts from up to downregulation) compared to interacting with single mutualists. Rhizobia also affected the expression of several mycorrhizal genes, including those involved in nutrient transfer to host plants, indicating that partner species can also impact each other's molecular phenotypes. Collectively, these data illustrate the diverse molecular mechanisms and transcriptional responses associated with the synergistic benefits of multiple mutualists.

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“…AM inoculums and rhizobia were applied as the seeds were sown. 1/4 Hoagland solution (Hoagland 1950) was supplied regularly and the pots were weighed every week to adjust the water content. After five weeks, plants were harvested for analysis.…”

Section: Experimental Design and Biological Treatmentsmentioning

confidence: 99%

Synergistic Interactions Between Salt-tolerant Rhizobia and Arbuscular Mycorrhizal Fungi on Salinity Tolerance of Sesbania cannabina Plants

Ren

Bai

Chen

et al. 2016

J Plant Growth Regul

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Legumes can host rhizobia and mycorrhizal fungi, and this triple symbiosis might be exploited to improve saline soil fertility. Therefore, a greater understanding of the interaction of rhizobia and arbuscular mycorrhizal fungus during legume growth in saline soil is required. We investigated the efficiency of salt tolerance conferred by rhizobia in mycorrhizal Sesbania cannabina. Greenhouse experiments were conducted in which S. cannabina plants inoculated with Glomus mosseae BGC NM03D (GM), and two rhizobia strains Agrobacterium pusense YIC4105 (4105) and Neorhizobium huautlense YIC4083 (4083), were exposed to 100 and 200 mM NaCl. Under 200 mM NaCl stress, plants inoculated with 4105, rather than 4083, showed significant increases in shoot and root dry mass compared with non-inoculated plants. Simultaneously, a significant increase over GM-inoculated plants in mycorrhizal colonization and dependency was recorded for 4105 ? GM-inoculated plants compared with 4083 ? GM-inoculated plants. In addition, under NaCl stress, significant increases in the number and mass of nodules, nitrogenase activity, and leghemoglobin content of nodules occurred in 4105 ? GM-inoculated plants compared with 4083 ? GM-inoculated plants. Furthermore, the activities of antioxidant enzymes in rhizobiainoculated plants were significantly higher in the GM ? 4105 group than the 4083 ? GM group. The malondialdehyde content of plants from the 4105 ? GM group was significantly lower than in the 4083 ? GM group. Thus, the results revealed a synergistic relationship among the 4105 and GM in alleviating salt stress in S. cannabina. Salt-tolerant rhizobia might improve the salinity tolerance of S. cannabina by enhancing the antioxidant system.

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Involvement of autoregulation in the interaction between rhizobial nodulation and AM fungal colonization in soybean roots

Cited by 27 publications

References 72 publications

Nutrient demand and fungal access to resources control the carbon allocation to the symbiotic partners in tripartite interactions of Medicago truncatula

Nutrient demand and fungal access to resources control the carbon allocation to the symbiotic partners in tripartite interactions of Medicago truncatula

Multiple mutualist effects on genomewide expression in the tripartite association between Medicago truncatula, nitrogen‐fixing bacteria and mycorrhizal fungi

Synergistic Interactions Between Salt-tolerant Rhizobia and Arbuscular Mycorrhizal Fungi on Salinity Tolerance of Sesbania cannabina Plants

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