Evolutionary history of mycorrhizal associations between Japanese Oxygyne (Thismiaceae) species and Glomeraceae fungi

Suetsugu, Kenji; Okada, Hidehito; Hirota, Shun K.; Suyama, Yoshihisa

doi:10.1111/nph.18163

Cited by 9 publications

(6 citation statements)

References 35 publications

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“…Arbuscular mycorrhizal fungi (AMF) can establish widespread mutualistic symbiotic associations with more than 80% of terrestrial plants (Smith and Read, 2010;Tawaraya, 2022;Thismia, 2022). Upon the establishment of symbiosis, they provide mineral nutrients, particularly phosphorus (P) and nitrogen (N), to the host plants (Kobae, 2019;Das et al, 2022;Rui et al, 2022;Yadav et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Exogenous myristate promotes the colonization of arbuscular mycorrhizal fungi in tomato

Liu,

Feng,

Zhang

et al. 2023

Front. Plant Sci.

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Arbuscular mycorrhizal fungi (AMF) can establish symbiotic associations with the roots of most terrestrial plants, thereby improving the tolerance of the host plants to biotic and abiotic stresses. Although AMF cannot synthesize lipids de novo, they can obtain lipids from the root cells for their growth and development. A recent study reveals that AMF can directly take up myristate (C14:0 lipid) from the environment and produce a large amount of hyphae in asymbiotic status; however, the effect of environmental lipids on AM symbiosis is still unclear. In this study, we inoculated tomato (Solanum lycopersicum) with AMF in an in vitro dual culture system and a sand culture system, and then applied exogenous myristate to the substrate, in order to explore the effect of exogenous lipids on the mycorrhizal colonization of AMF. We investigated the hyphae growth, development, and colonization of AMF, and examined the gene expression involved in phosphate transport, lipid biosynthesis, and transport. Results indicate that exogenous lipids significantly stimulated the growth and branching of hyphae, and significantly increased the number of hyphopodia and mycorrhizal colonization of AMF, with arbuscular abundance and intraradical spores or vesicles being the most promoted. In contrast, exogenous myristate decreased the growth range and host tropism of the germ tubes, and largely inhibited the exchange of nutrition between symbionts. As a result, exogenous myristate did not affect the plant growth. This study suggests that lipids promote mycorrhizal colonization by enhancing the growth and development of AMF hyphae and increasing their contact opportunities with plant roots. To the best of our knowledge, this is the first report that shows that lipids promote the colonization of AMF. Our study highlights the importance of better understanding the roles of environmental lipids in the establishment and maintenance of AM symbiosis and, thus, in agricultural production.

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Section: Introductionmentioning

confidence: 99%

Exogenous myristate promotes the colonization of arbuscular mycorrhizal fungi in tomato

Liu,

Feng,

Zhang

et al. 2023

Front. Plant Sci.

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“…Several recent studies have interpreted significant results of global-fit approaches as evidence for phylogenetic congruence and interpreted them as signs of codiversification (e.g. Fuzessy et al 2022;Suetsugu et al 2022;Suzuki et al 2022). Our findings suggest that there is evidence for cophylogenetic signal in the studied systems, which is already insightful in itself, but that little can be said about phylogenetic congruence and codiversification before event-based methods are applied.…”

Section: Discussionmentioning

confidence: 99%

“…Numerous cophylogenetic systems observed in nature, however, are characterized by many-to-many interactions (Bascompte and Jordano 2013;Perez-Lamarque et al 2022b), and the same methods have been regularly applied to such systems, and interpreted as tests of phylogenetic congruence (see e.g. Fuzessy et al 2022;Suetsugu et al 2022;Suzuki et al 2022 for recent examples). If, under these situations, these methods in fact do not measure phylogenetic congruence, this can lead to a misinterpretation of the results.…”

Section: Introductionmentioning

confidence: 99%

Distinguishing Cophylogenetic Signal from Phylogenetic Congruence Clarifies the Interplay Between Evolutionary History and Species Interactions

Perez-Lamarque,

Morlon

2024

Systematic Biology

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Interspecific interactions, including host-symbiont associations, can profoundly affect the evolution of the interacting species. Given the phylogenies of host and symbiont clades and knowledge of which host species interact with which symbiont, two questions are often asked: “Do closely related hosts interact with closely related symbionts?” and “Do host and symbiont phylogenies mirror one another?”. These questions are intertwined and can even collapse under specific situations, such that they are often confused one with the other. However, in most situations, a positive answer to the first question, hereafter referred to as “cophylogenetic signal”, does not imply a close match between the host and symbiont phylogenies. It suggests only that past evolutionary history has contributed to shaping present-day interactions, which can arise, for example, through present-day trait matching, or from a single ancient vicariance event that increases the probability that closely related species overlap geographically. A positive answer to the second, referred to as “phylogenetic congruence”, is more restrictive as it suggests a close match between the two phylogenies, which may happen, for example, if symbiont diversification tracks host diversification or if the diversifications of the two clades were subject to the same succession of vicariance events. Here we apply a set of methods (ParaFit, PACo, and eMPRess), which significance is often interpreted as evidence for phylogenetic congruence, to simulations under three biologically realistic scenarios of trait matching, a single ancient vicariance event, and phylogenetic tracking with frequent cospeciation events. The latter is the only scenario that generates phylogenetic congruence, whereas the first two generate a cophylogenetic signal in the absence of phylogenetic congruence. We find that tests of global-fit methods (ParaFit and PACo) are significant under the three scenarios, whereas tests of event-based methods (eMPRess) are only significant under the scenario of phylogenetic tracking. Therefore, significant results from global-fit methods should be interpreted in terms of cophylogenetic signal and not phylogenetic congruence; such significant results can arise under scenarios when hosts and symbionts had independent evolutionary histories. Conversely, significant results from event-based methods suggest a strong form of dependency between hosts and symbionts evolutionary histories. Clarifying the patterns detected by different cophylogenetic methods is key to understanding how interspecific interactions shape and are shaped by evolution.

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“…BLAST searches against the MaarjAM revealed that closely related AM fungi of the isolate CI1701 are the mycorrhizal fungi of various mycoheterotrophic plants not only in Gentianaceae but also in Burmanniaceae and Triuridaceae. Furthermore, VTX166 was recently detected in mycoheterotrophic Oxygyne yamashitae (Thismiaceae; Suetsugu, Okada, Hirota, & Suyama, 2022). Perez-Lamarque et al (2020) found that some closely related AM fungi were shared by independently emerged mycoheterotrophic plant lineages.…”

Section: Discussionmentioning

confidence: 99%

Isolation and identification of an arbuscular mycorrhizal fungus specifically associated with mycoheterotrophic seedlings of Gentiana zollingeri (Gentianaceae)

Kusakabe

Yamato

2023

Mycoscience

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Gentiana zollingeri (Gentianaceae) is an initial mycoheterotrophic plant that depends on a specific group of arbuscular mycorrhizal (AM) fungi for carbon source during underground growth after seed germination. In this study, a mycorrhizal fungus dominant in mycoheterotrophic seedlings of G. zollingeri was successfully isolated from a soil core collected from a point close to a flowering G. zollingeri. The AM fungal isolate was identified as conspecific or closely related to Dominikia aurea (Glomeraceae) by spore morphology and molecular phylogeny. Basic Local Alignment Search Tool (BLAST) searches against the MaarjAM database showed that the nuclear small subunit ribosomal DNA sequences of the isolate matched the AM fungal sequences obtained from a wide range of plants in various ecosystems, including several mycoheterotrophs. Thus, it is suggested that the AM fungal isolate is one of the cheating susceptible AM fungi. Furthermore, the sequences corresponded to those of a group of AM fungi dominantly detected in Japanese temperate forests. Accordingly, there is a possibility that mycoheterotrophic plants, including seedlings of G. zollingeri, may target AM fungi with a wide host range and ubiquitous distribution.

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Evolutionary history of mycorrhizal associations between Japanese Oxygyne (Thismiaceae) species and Glomeraceae fungi

Cited by 9 publications

References 35 publications

Exogenous myristate promotes the colonization of arbuscular mycorrhizal fungi in tomato

Exogenous myristate promotes the colonization of arbuscular mycorrhizal fungi in tomato

Distinguishing Cophylogenetic Signal from Phylogenetic Congruence Clarifies the Interplay Between Evolutionary History and Species Interactions

Isolation and identification of an arbuscular mycorrhizal fungus specifically associated with mycoheterotrophic seedlings of <i>Gentiana zollingeri</i> (<i>Gentianaceae</i>)

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