Are liverworts imitating mycorrhizas?

Selosse, Marc‐André

doi:10.1111/j.1469-8137.2004.01298.x

Cited by 37 publications

(40 citation statements)

References 27 publications

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“…Since the glomeromycete associations in liverworts involve cellular interactions like those in arbuscular mycorrhizas (Paszkowski 2006), Wang & Qiu (2006) have hypothesized homology in terms of their biological interactions. Indeed, cytologically the associations in gametophytes of lycopods and basal ferns (Duckett & Ligrone 1992, 2005Schmid & Oberwinkler 1993 are virtually identical to those in the liverworts. The near basal position of the Marchantiopsida and Metzgeriidae in embryophyte phylogeny and the widespread occurrence of glomeromycetes within them fit the notion that the co-evolution of liverworts with these fungi predated the appearance of arbuscular mycorrhizas in tracheophytes (Kottke & Nebel 2005;Wang & Qiu 2006).…”

Section: Complex and Simple Thalloid Liverworts (Marchantiopsida And Jungmentioning

confidence: 78%

“…The near basal position of the Marchantiopsida and Metzgeriidae in embryophyte phylogeny and the widespread occurrence of glomeromycetes within them fit the notion that the co-evolution of liverworts with these fungi predated the appearance of arbuscular mycorrhizas in tracheophytes (Kottke & Nebel 2005;Wang & Qiu 2006). However, the fact that members of Glomus Group A, a derived clade within the genus that also forms mycorrhizas in tracheophytes, are widespread in these liverwort taxa that are widely separate both geographically and phylogenetically led Selosse (2005) to an alternative hypothesis: host shifting from tracheophytes to liverworts. Ligrone et al (2007) noted that these two notions are not necessarily mutually exclusive since, in a tracheophyte-dominated world, advanced glomeromycetes might well replace more primitive endophytes.…”

Section: Complex and Simple Thalloid Liverworts (Marchantiopsida And Jungmentioning

confidence: 98%

See 1 more Smart Citation

Fungal symbioses in bryophytes: New insights in the Twenty First Century

Pressel¹,

Bidartondo²,

Ligrone³

et al. 2014

Phytotaxa

114

126

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Fungal symbioses are one of the key attributes of land plants. The twenty first century has witnessed the increasing use of molecular data complemented by cytological studies in understanding the nature of bryophyte-fungal associations and unravelling the early evolution of fungal symbioses at the foot of the land plant tree. Isolation and resynthesis experiments have shed considerable light on host ranges and very recently have produced an incisive insight into functional relationships. Fungi with distinctive cytology embracing short-lived intracellular fungal lumps, intercellular hyphae and thick-walled spores in Treubia and Haplomitrium are currently being identified as belonging to a more ancient group of fungi than the glomeromycetes, previously assumed to be the most primitive fungi forming symbioses with land plants. Glomeromycetes, like those in lower tracheophytes, are widespread in complex and simple thalloid liverworts. Limited molecular identification of these as belonging to the derived clade Glomus Group A has led to the suggestion of host swapping from tracheophytes. Ascomycetes, all identified to date as Rhizoscyphus ericae and having an extremely wide host range extending into the Ericales, occur in the rhizoids of a range of leafy liverwort families that are sister to the Schistochilaceae, where the fungus induces rhizoid branching and septation. Dating of the Schistochilaceae suggests that these liverwort rhizoid associations predated ericoid mycorrhizas. A more restricted distribution of basidiomycetes, all identified as members of the genus Sebacina, is interpreted as a secondary acquisition in leafy liverworts following the loss of ascomycetes. Unlike the latter and ectomycorrhizal basidiomycetes in tracheophytes, these are host specific. Whereas there is no evidence of host digestion for either the ascomycetes or basidiomycetes in leafy liverworts, basidiomycetes in the Aneuraceae display regular colonization and digestion cycles. Considerable molecular diversity in the aneuracean fungi, mainly in the genus Tulasnella with occasional sebacinoids, mirrors the same in the host liverworts. Nesting of the only mycoheterotrophic liverwort Cryptothallus within Aneura is congruent with the phylogeny of the endophytes. Glomeromycete fungi have been identified in Phaeoceros and Anthoceros whereas Dendroceros, Megaceros and Nothoceros lack endophytes but the distribution of fungi across hornworts has yet to be explored. In contrast to liverworts and hornworts, there is no evidence of mycorrhiza-like associations in mosses. Claims that the fossil Prototaxites was a fossil fungus-associated liverwort are discounted.

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Section: Complex and Simple Thalloid Liverworts (Marchantiopsida And Jungmentioning

confidence: 78%

Section: Complex and Simple Thalloid Liverworts (Marchantiopsida And Jungmentioning

confidence: 98%

Fungal symbioses in bryophytes: New insights in the Twenty First Century

Pressel¹,

Bidartondo²,

Ligrone³

et al. 2014

Phytotaxa

114

126

View full text Add to dashboard Cite

show abstract

“…were found as mycobionts. Liverworts and early land plant symbioses were reviewed by Selosse (2005), with the suggestion that the possibility of a secondary, late origin for liverwortfungal associations should not be overlooked. This may actually happen for associations with Sebacinales.…”

Section: Mycorrhizal Network and Species Richness Of Sebacinales In mentioning

confidence: 99%

Enigmatic Sebacinales

Oberwinkler¹,

Riess²,

Bauer³

et al. 2013

Mycol Progress

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A historical retrospect and a taxonomic update will deal with Sebacina s.l. and s.str., Craterocolla, Efibulobasidium, Serendipita, Trem ell odendron, Trem ell oscypha, Tremellostereum, and Piriformospora, the Sebacinaceae, and the Sebacinales. Phylogenetic hypotheses for the order and subordinal taxa are discussed, including environmental sequence taxa. The cryptic biodiversity in Sebacinales is extensive but mostly unresolved with respect to the species involved.

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“…In a study of British hepatics, species of the leafy liverwort genus Cephaloziella were found to possess fungal associations restricted to rhizoids, with over half the rhizoid tips colonized (Duckett et al ., 1991). Fungal colonization of rhizoids is characterized by dense intracellular growth that appears analogous to ericoid mycorrhizal coils (Selosse, 2005). The functional nature of the relationship between liverworts and their endophytic fungi is not known, but the formation of structures similar to those seen in ericoid mycorrhizal roots suggests an active role in plant survival (Read et al ., 2000).…”

Section: Introductionmentioning

confidence: 99%

Widespread association between the ericoid mycorrhizal fungus Rhizoscyphus ericae and a leafy liverwort in the maritime and sub‐Antarctic

2007

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Summary• A recent study identified a fungal isolate from the Antarctic leafy liverwort Cephaloziella varians as the ericoid mycorrhizal associate Rhizoscyphus ericae . However, nothing is known about the wider Antarctic distribution of R. ericae in C. varians , and inoculation experiments confirming the ability of the fungus to form coils in the liverwort are lacking.• Using direct isolation and baiting with Vaccinium macrocarpon seedlings, fungi were isolated from C. varians sampled from eight sites across a 1875-km transect through sub-and maritime Antarctica. The ability of an isolate to form coils in aseptically grown C. varians was also tested.• Fungi with 98-99% sequence identity to R. ericae internal transcribed spacer (ITS) region and partial large subunit ribosomal (r)DNA sequences were frequently isolated from C. varians at all sites sampled. The EF4/Fung5 primer set did not amplify small subunit rDNA from three of five R. ericae isolates, probably accounting for the reported absence of the fungus from C. varians in a previous study. Rhizoscyphus ericae was found to colonize aseptically-grown C. varians intracellularly, forming hyphal coils.• This study shows that the association between R. ericae and C. varians is apparently widespread in Antarctica, and confirms that R. ericae is at least in part responsible for the formation of the coils observed in rhizoids of field-collected C. varians .

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Are liverworts imitating mycorrhizas?

Cited by 37 publications

References 27 publications

Fungal symbioses in bryophytes: New insights in the Twenty First Century

Fungal symbioses in bryophytes: New insights in the Twenty First Century

Enigmatic Sebacinales

Widespread association between the ericoid mycorrhizal fungus Rhizoscyphus ericae and a leafy liverwort in the maritime and sub‐Antarctic

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