Pisolithus

Chambers, Susan M.; Cairney, J. W. G.

doi:10.1007/978-3-662-06827-4_1

Cited by 20 publications

(24 citation statements)

References 153 publications

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“…The host range of Pisolithus fungi has been generally considered to be relatively wide, because the genus develops their basidiomata in association with many tree species and has also been confirmed as forming ectomycorrhizas in laboratory synthesis experiments with 20 host genera (Marx, 1977;Martin et al, 1998;Chambers and Cairney, 1999). The survey results for the fruitbodies in Morocco showed that Pisolithus is a common ectomycorrhizal fungus in native Quercus forests, Pinus and Eucalyptus woodlands and Cistus scrubs.…”

Section: Discussionmentioning

confidence: 91%

“…Although considerable variation in Pisolithus isolates has been shown to exist in terms of basidiomata, basidiospores and isolated culture morphology, sexual incompatibility, mycorrhiza-forming ability, electrophoretic protein profiles and host specificity Lamhamedi et al, 1990;Burgess et al, 1994Burgess et al, , 1995Anderson et al, 1998Anderson et al, , 2001Chambers and Cairney, 1999;Martin et al, 1998Martin et al, , 2002Diez et al, 2001), Pisolithus isolates have been regarded as conspecific (Watling et al, 1995) and have been thus commonly been referred to as Pisolithus tinctorius (Pers.) Coker & Couch [Syn.…”

Section: Introductionmentioning

confidence: 98%

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Molecular phylogeny of Pisolithus species from Moroccan forest woodlands

Yakhlef¹,

Mousain

Duponnois³

et al. 2009

Symbiosis

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The phylogenetic relationships among 200 Pisolithus basidiomata collected from pine, oak, and eucalypt forests and rockrose scrubs in Morocco were investigated. Using PCR-RFLP analysis of the internal transcribed spacer (ITS) of ribosomal DNA, this collection could be divided into 5 groups, by using PCR-RFLP analysis of the internal transcribed spacer (ITS) of ribosomal DNA. The ITS of a representative basidioma of each group was sequenced, and a phylogenetic analysis was performed. The dendrogram suggests that at least five Pisolithus species are present in Morocco. Pisolithus basidiomata collected in the Pinus and Quercus forests correspond to Pisolithus arrhizus and P. species 4 as previously described by Martin and colleagues in 2002. Those collected from the eucalyptus forests, under E. gomphocephala and E. camaldulensis, correspond to P. albus and P. microcarpus. Basidiomata collected from the rockrose scrubs, under Cistus crispus, C. monspeliensis or C. salviifolius, are all identified as Pisolithus species 3. Phylogenetic analyses showed that our different Pisolithus grouped well with Pisolithus specimens from other geographical origins.

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Section: Discussionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 98%

Molecular phylogeny of Pisolithus species from Moroccan forest woodlands

Yakhlef¹,

Mousain

Duponnois³

et al. 2009

Symbiosis

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“…The Pisolithus life cycle encompasses the release of basidiospores, produced inside closed basidiocarps, after the weathering of the basidiocarp apical layers, allowing basidiospore dispersion by the wind, rain water, or animals (Brundrett et al, 1996;Chambers and Cairney, 1999). Upon reaching the soil, basidiospore germination takes place in the favorable environment of the host plant rhizosphere, where appropriate chemical signals released by the roots trigger the process (Fries, 1987;Martin, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…The ectomycorrhizal fungus Pisolithus microcarpus associates with plants of economic interest, such as eucalypts, and has been used as a model organism for studies on several ecological, physiological, and genetic aspects of the ectomycorrhizal associations (Chambers and Cairney, 1999). The Pisolithus life cycle encompasses the release of basidiospores, produced inside closed basidiocarps, after the weathering of the basidiocarp apical layers, allowing basidiospore dispersion by the wind, rain water, or animals (Brundrett et al, 1996;Chambers and Cairney, 1999).…”

Section: Introductionmentioning

confidence: 99%

“…Pisolithus is heterothallic and the fusion of two sexually compatible monokaryons, i.e., plasmogamy, leads to the production of a dikaryotic mycelium, characterized by the presence of two haploid nuclei per cell and clamp connections along the hyphae (Kope, 1992;Carvalho et al, 1997). Once formed, the dikaryon associates symbiotically with the roots of compatible tree species and is subsequently stimulated to produce basidiocarps upon receiving unknown signals from the host plant and the environment (Chambers and Cairney, 1999).…”

Section: Introductionmentioning

confidence: 99%

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Basidiosporogenesis, meiosis, and post-meiotic mitosis in the ectomycorrhizal fungus Pisolithus microcarpus

Campos

Costa

2010

Fungal Genetics and Biology

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Pisolithus microcarpus (Cooke and Massee) G. Cunn. is a model organism for the studies on the ecology, physiology, and genetics of the ectomycorrhizal associations. However, little is known about the basidiosporogenesis in this species and, in particular, the nuclear behavior after karyogamy. In this work, the events involved in basidiosporogenesis and meiosis in P. microcarpus were analyzed using fluorescence and scanning electron microscopy. The basidia are formed inside peridioles by the differentiation of the cells along the whole hyphae. Basidial cells measure 12-18 microm in length and 6-7 microm in diameter. P. microcarpus produces eight basidiospores per basidium imbibed in a gelatinous matrix in the basidiocarp. The basidiospores are globose, equinate, with blunt spines, and measure 6-8 microm. Karyogamy can take place inside basidia as well as in undifferentiated hyphal cells followed by nuclear migration to a newly developed basidium where meiosis takes place. After the formation of the meiotic tetrad, one round of post-meiotic mitosis occurs, resulting in the production of eight nuclei per basidium. The newly-formed nuclei migrate into the basidiospores asynchronously, resulting in the production of eight uninucleate spores. This corresponds to pattern A of post-meiotic mitosis. This work is the first report on meiosis and post-meiotic mitosis during basidiosporogenesis in P. microcarpus and contributes to clarify some aspects of the biology and genetics of this ectomycorrhizal species.

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Genetic population structure of the ectomycorrhizal fungus Pisolithus microcarpus suggests high gene flow in south-eastern Australia

2010

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Pisolithus are ectomycorrhizal fungi that associate with roots of numerous plant species in natural and plantation forests worldwide. Despite the fact that Pisolithus spp. are present in plantation forests in many countries, knowledge of the genetic population structure of Pisolithus spp. remains limited. In this study, we have tested the hypothesis that a propensity for long-distance spore dispersal in Pisolithus microcarpus, along with the widespread distribution of potential eucalypt and acacia plant hosts in south-eastern Australia facilitates gene flow that limits population differentiation. Five polymorphic simple sequence repeat markers were used to investigate the population structure of P. microcarpus. Isolates were grouped according to geographical origin and isolate genotypes were analysed among the geographical populations. Pairwise F (ST) estimates indicated limited genetic differentiation among the geographical populations. Analysis of molecular variance revealed that most of the genetic variation present was within geographical populations, with only 1.3% of the genetic variation among P. microcarpus geographical populations. This was particularly pronounced for four geographical populations within a ca 7,000 km(2) area New South Wales, which were each separated by < 100 km and appeared to be genetically homogeneous. The lack of population structure is suggested to be due to a high degree of gene flow, via basidiospores, between the New South Wales geographical populations.

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Pisolithus

Cited by 20 publications

References 153 publications

Molecular phylogeny of Pisolithus species from Moroccan forest woodlands

Molecular phylogeny of Pisolithus species from Moroccan forest woodlands

Basidiosporogenesis, meiosis, and post-meiotic mitosis in the ectomycorrhizal fungus Pisolithus microcarpus

Genetic population structure of the ectomycorrhizal fungus Pisolithus microcarpus suggests high gene flow in south-eastern Australia

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