Philippe Callac - Academia.edu (original) (raw)
Papers by Philippe Callac
Le Centre pour la Communication Scientifique Directe - HAL - memSIC, 2014
Le Centre pour la Communication Scientifique Directe - HAL - memSIC, 1996
HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.
Le Centre pour la Communication Scientifique Directe - HAL - Université de Nantes, 2018
Le Centre pour la Communication Scientifique Directe - HAL - Diderot, Apr 5, 2008
Phytotaxa, 2018
Field collections of Agaricus were collected in the Dominican Republic from 2009–2016 with the in... more Field collections of Agaricus were collected in the Dominican Republic from 2009–2016 with the intent to evaluate the diversity in this genus, which was quasi-unknown in this country. In the same period, studies on tropical Agaricus revealed tropical clades that remained unclassified. A new taxonomic system of classification was developed, with the aim, inter alia, to integrate such tropical clades. A recent phylogenetic study, which included some samples from the Dominican Republic, revealed they belonged to three putative new sections. Our objective in this paper is to describe the species of Agaricus collected in this country and to classify them whitin the new taxonomic system, including formal descriptions of the three new sections to which they belong. A preliminary study indicated that the collections of the Dominican Republic belong either to a group of three related subgenera (Flavoagaricus, Minores, and Minoriopsis) or to the unrelated A. subg. Pseudochitonia. For the spec...
Phytotaxa, 2016
The fungal genus Agaricus includes edible, medicinal and some toxic species mainly in the Agaricu... more The fungal genus Agaricus includes edible, medicinal and some toxic species mainly in the Agaricus sect. Xanthodermatei. As the diversity of the genus is not well known in Iran, an inventory of the species has begun in 2013 in different provinces. Morphological and/or molecular analyses of 12 selected specimens from recent field collections and from herbarium specimens revealed that ten of them belonged to four potentially poisonous species of the Agaricus sect. Xanthodermatei: A. iodosmus, A. moelleri, A. phaeolepidotus and A. xanthodermus. Moreover, our study revealed that previous first records of A. xanthodermus and A. moelleri in Iran had been based on morphologically misidentified and correctly identified specimens, respectively. Finally, three species, A. iodosmus, A. phaeolepidotus and A. xanthodermus are reported as new records for Iran mycobiota. The four species of the section are described and illustrated.
Mycologia, 1993
A distinctive variety of A. bisporus has been discovered in several habitats in the low Sonoran D... more A distinctive variety of A. bisporus has been discovered in several habitats in the low Sonoran Desert of the Coachella Valley of California at elevations below sea level. The tetrasporic character of the basidia is consistently predominant in this local population. The spores of this population tend to be shorter and narrower than those of the bisporic strains. The genotypes of two individuals from this population clearly place them in the species A. bisporus, where they form a cohesive group in specieswide cluster analyses of nuclear genotypic similarity. The relative genetic divergence of this population from others in the species is of a similar order to that observed between other geographically isolated, bisporic populations of the species. The tetrasporic individuals exhibit complete interfertility with several bisporic strains of European and Coastal Californian origin. Because of their basidial and spore morphologies, these mushrooms do not fall within the traditional circumscription of A. bisporus. Varietal status is proposed for these distinctive, tetrasporic members ofthe species, and A. bisporus var. burnettii is described. Primary habitat of these mushrooms is being destroyed rapidly near our field sites. Geographical range of the variety is unknown.
Current Genetics, 2014
sequences that appeared to evolve toward their elimination. Low nucleotide substitution rates wer... more sequences that appeared to evolve toward their elimination. Low nucleotide substitution rates were found in both types of intronic sequences. This feature was also shared by all types of studied mitochondrial sequences, not only intronic but also genic and intergenic ones, when compared with nuclear sequences. Hence, the intraspecific evolution of A. bisporus mitochondrial genome appears characterized by both an important mobility (presence/absence) of large group I introns and by low nt substitution rates. This stringent conservation of mitochondrial sequences, when compared with their nuclear counterparts, appears irrespective of their apparent functionality and contrasts to what is widely accepted in fungal sequence evolution. This strengthens the usefulness of mtDNA sequences to get clues on intraspecific evolution.
Mycotaxon, 2012
A new collection of Lentinus giganteus from Sri Lanka, where it was originally described, is used... more A new collection of Lentinus giganteus from Sri Lanka, where it was originally described, is used to epitypify the species after comparison with the type protologue and drawings held in Peradeniya, Sri Lanka; a full description and illustrations are provided. Additional collections were made at three sites in northern Thailand. Phylogenetic ITS-1-5.8S-ITS2 rDNA sequence analyses using maximum likelihood, maximum parsimony and Bayesian inference all support the transfer of L. giganteus to Pleurotus. Although the collections from Thailand differ slightly morphologically and phylogenetically from P. giganteus sensu stricto, these differences do not yet merit specific status. Instead, P. giganteus is maintained as one widely variable species represented by relatively large fruiting bodies. Saprobic on buried well-rotted wood in forests, P. giganteus is widely consumed in Sri Lanka and might be profitably cultivated in Thailand.
Mycoscience, 2012
Agaricus flocculosipes is described as new from northern Thailand and Mayotte based on morphology... more Agaricus flocculosipes is described as new from northern Thailand and Mayotte based on morphology and ITS sequence analysis. The new species is compared with similar taxa, and a comprehensive description, line drawings, and colored photographs are provided. Agaricus flocculosipes is distinguished among the species in section Arvenses by its relatively large sporocarps (110-180 mm in diameter), erect floccose squamules on the surface of the stipe, and relatively small basidiospores (less than 6.5 lm long). Phylogenetic analyses based on ITS sequence data using maximum likelihood, parsimony, and Bayesian analyses all support A. flocculosipes as being a distinct species within section Arvenses. The new taxon is potentially cultivatable as it is presumably heterothallic, exhibits extensive genetic diversity, and occurs in section Arvenses, a lineage that contains other edible cultivatable taxa such as Agaricus arvensis and Agaricus subrufescens.
Fungal Diversity, 2011
... Ruilin Zhao & Samantha Karunarathna &... more ... Ruilin Zhao & Samantha Karunarathna & Olivier Raspé & Luis A. Parra & Jacques Guinberteau & Magalie Moinard & André De Kesel & Gérard Barroso & Régis Courtecuisse & Kevin D. Hyde & Atsu K. Guelly & Dennis E. Desjardin & Philippe Callac ... ARP173 A. bernardi USA ...
Fungal Biology, 2011
The button mushroom Agaricus bisporus commercially cultivated requires 16e19 C during the fruitin... more The button mushroom Agaricus bisporus commercially cultivated requires 16e19 C during the fruiting period. Wild strains are also present in natural habitat, and in light of their wide range of geographic distribution reported, from boreal region to tropical region, questions on the development adaptation to temperature arose. Isolates from various geographic areas were screened for their ability to fruit at higher temperature (FHT ability) than commercial cultivars. The FHT trait discriminated at the varietal rank. Agaricus bisporus var. eurotetrasporus was unable to develop any sporophores whilst A. bisporus var. burnettii adapted perfectly to 25 C for fruiting, suggesting that the FHT ability is a fixed trait in these varieties. In contrast, FHT ability of A. bisporus var. bisporus appeared variable and correlated neither with climate/microclimate nor with habitat. However, FHT ability taken as a whole appeared higher in North American populations than in European ones. Some A. bisporus var. bisporus isolates revealed a good potential for cultivation at 25 C.
Cryptogamie, Mycologie, 2012
-Une description, des dessins, et des photographies en couleurs d'Agaricus megalosporus, une espè... more -Une description, des dessins, et des photographies en couleurs d'Agaricus megalosporus, une espèce nouvelle, sont présentés. La nouveauté de cette espèce est supportée à la fois par sa morphologie et par une analyse phylogénétique. A. megalosporus se caractérise par ses sporophores de taille moyenne ou grande, un stipe fortement fibrillosquamuleux et des basidiospores relativement grandes. L'analyse de séquences ITS par maximum de vraisemblance, maximum de parcimonie non pondérée et analyse Bayesienne démontre que A. megalosporus appartient à la section Minores.
Komsit Wisitrassameewong 1,2 , Samantha C. Karunarathna 1,2 , Naritsada Thongklang 1 , Ruilin Zha... more Komsit Wisitrassameewong 1,2 , Samantha C. Karunarathna 1,2 , Naritsada Thongklang 1 , Ruilin Zhao 3 , Philippe Callac 4 , Ekachai Chukeatirote ... Holotype, Pile of leaves, Peck CH 1893, Deeply hemispherical, becoming convex or plano-convex, whitish, grayish or dull reddish ...
The invention concerns intraspecific hybrids of Agaricus bisporus capable of bearing fruit at rel... more The invention concerns intraspecific hybrids of Agaricus bisporus capable of bearing fruit at relatively high temperature and without roughing-in, and the method for obtaining them consisting in a step of cross-breeding in particular between a first and a second Agaricus bisporus, one of which at least belongs to theburnettii variety, and a step of selecting the resulting hybrids having the characteristics mentioned above. The cultivation of the resulting hybrids is easier and less expensive than the standard method of cultivating mushrooms.
The complete sequence of the mitochondrial cox1 gene, encoding the largest subunit of the cytochr... more The complete sequence of the mitochondrial cox1 gene, encoding the largest subunit of the cytochrome oxidase of the Basidiomycota Agaricus bisporus has been achieved. It has the longest cox1 gene (29,902 nt) with the largest number of group I introns (18 group I introns) reported to date in any eukaryote. The group I introns in the A. bisporus cox1 gene are similar to those reported in other Basidiomycetes includeing: 3 of the 4 introns in Agrocybe aegerita, 7 of the 9 introns in Pleurotus ostreatus, 3 of the 6 introns in Moniliophthora perniciosa, and 10 of the 15 introns in Trametes cingulata. constituting 18 of the 23 introns described in all Basidiomycota available genes, Moreover, the A. bisporus cox1 gene possesses two introns specifically reported in this gene (iAbi1 and iAbi14) and one intron (iAbi 18) possessing orthologous sequences only in the Ascomycota phylum but unknown to date in the Basidiomycota. Hence, A. bisporus cox1 gene contains three-quarters (18/24) of the fu...
Scientific Reports
In a recent revision of the genus Agaricus, A. section Xanthodermatei was split into two sections... more In a recent revision of the genus Agaricus, A. section Xanthodermatei was split into two sections A. sect. Hondenses and A. sect. Xanthodermatei. Our objectives were to investigate the species diversity of both sections in Pakistan and to give an overview of the major clades. Phylogenetic analyses based on the combined nucLSU, ITS and TEF1 dataset from 35 specimens of both sections revealed three major clades. Analyses based on ITS dataset and 106 specimens, including 33 from Pakistan, reveal eight new species and one new record species. These nine species are described in detail. It is noteworthy that intraspecific variability as well as interspecific variability between closely related species were very low in ITS sequences in many cases. In the case of the two new species A.xanthochromaticus and A.griseovariegatus, TEF1 sequence data were much more efficient than ITS to distinguish these species from each other. The other new species are A.atroumbonatus, A.fumidicolor, A.macropep...
Le Centre pour la Communication Scientifique Directe - HAL - memSIC, 2014
Le Centre pour la Communication Scientifique Directe - HAL - memSIC, 1996
HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific re... more HAL is a multidisciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.
Le Centre pour la Communication Scientifique Directe - HAL - Université de Nantes, 2018
Le Centre pour la Communication Scientifique Directe - HAL - Diderot, Apr 5, 2008
Phytotaxa, 2018
Field collections of Agaricus were collected in the Dominican Republic from 2009–2016 with the in... more Field collections of Agaricus were collected in the Dominican Republic from 2009–2016 with the intent to evaluate the diversity in this genus, which was quasi-unknown in this country. In the same period, studies on tropical Agaricus revealed tropical clades that remained unclassified. A new taxonomic system of classification was developed, with the aim, inter alia, to integrate such tropical clades. A recent phylogenetic study, which included some samples from the Dominican Republic, revealed they belonged to three putative new sections. Our objective in this paper is to describe the species of Agaricus collected in this country and to classify them whitin the new taxonomic system, including formal descriptions of the three new sections to which they belong. A preliminary study indicated that the collections of the Dominican Republic belong either to a group of three related subgenera (Flavoagaricus, Minores, and Minoriopsis) or to the unrelated A. subg. Pseudochitonia. For the spec...
Phytotaxa, 2016
The fungal genus Agaricus includes edible, medicinal and some toxic species mainly in the Agaricu... more The fungal genus Agaricus includes edible, medicinal and some toxic species mainly in the Agaricus sect. Xanthodermatei. As the diversity of the genus is not well known in Iran, an inventory of the species has begun in 2013 in different provinces. Morphological and/or molecular analyses of 12 selected specimens from recent field collections and from herbarium specimens revealed that ten of them belonged to four potentially poisonous species of the Agaricus sect. Xanthodermatei: A. iodosmus, A. moelleri, A. phaeolepidotus and A. xanthodermus. Moreover, our study revealed that previous first records of A. xanthodermus and A. moelleri in Iran had been based on morphologically misidentified and correctly identified specimens, respectively. Finally, three species, A. iodosmus, A. phaeolepidotus and A. xanthodermus are reported as new records for Iran mycobiota. The four species of the section are described and illustrated.
Mycologia, 1993
A distinctive variety of A. bisporus has been discovered in several habitats in the low Sonoran D... more A distinctive variety of A. bisporus has been discovered in several habitats in the low Sonoran Desert of the Coachella Valley of California at elevations below sea level. The tetrasporic character of the basidia is consistently predominant in this local population. The spores of this population tend to be shorter and narrower than those of the bisporic strains. The genotypes of two individuals from this population clearly place them in the species A. bisporus, where they form a cohesive group in specieswide cluster analyses of nuclear genotypic similarity. The relative genetic divergence of this population from others in the species is of a similar order to that observed between other geographically isolated, bisporic populations of the species. The tetrasporic individuals exhibit complete interfertility with several bisporic strains of European and Coastal Californian origin. Because of their basidial and spore morphologies, these mushrooms do not fall within the traditional circumscription of A. bisporus. Varietal status is proposed for these distinctive, tetrasporic members ofthe species, and A. bisporus var. burnettii is described. Primary habitat of these mushrooms is being destroyed rapidly near our field sites. Geographical range of the variety is unknown.
Current Genetics, 2014
sequences that appeared to evolve toward their elimination. Low nucleotide substitution rates wer... more sequences that appeared to evolve toward their elimination. Low nucleotide substitution rates were found in both types of intronic sequences. This feature was also shared by all types of studied mitochondrial sequences, not only intronic but also genic and intergenic ones, when compared with nuclear sequences. Hence, the intraspecific evolution of A. bisporus mitochondrial genome appears characterized by both an important mobility (presence/absence) of large group I introns and by low nt substitution rates. This stringent conservation of mitochondrial sequences, when compared with their nuclear counterparts, appears irrespective of their apparent functionality and contrasts to what is widely accepted in fungal sequence evolution. This strengthens the usefulness of mtDNA sequences to get clues on intraspecific evolution.
Mycotaxon, 2012
A new collection of Lentinus giganteus from Sri Lanka, where it was originally described, is used... more A new collection of Lentinus giganteus from Sri Lanka, where it was originally described, is used to epitypify the species after comparison with the type protologue and drawings held in Peradeniya, Sri Lanka; a full description and illustrations are provided. Additional collections were made at three sites in northern Thailand. Phylogenetic ITS-1-5.8S-ITS2 rDNA sequence analyses using maximum likelihood, maximum parsimony and Bayesian inference all support the transfer of L. giganteus to Pleurotus. Although the collections from Thailand differ slightly morphologically and phylogenetically from P. giganteus sensu stricto, these differences do not yet merit specific status. Instead, P. giganteus is maintained as one widely variable species represented by relatively large fruiting bodies. Saprobic on buried well-rotted wood in forests, P. giganteus is widely consumed in Sri Lanka and might be profitably cultivated in Thailand.
Mycoscience, 2012
Agaricus flocculosipes is described as new from northern Thailand and Mayotte based on morphology... more Agaricus flocculosipes is described as new from northern Thailand and Mayotte based on morphology and ITS sequence analysis. The new species is compared with similar taxa, and a comprehensive description, line drawings, and colored photographs are provided. Agaricus flocculosipes is distinguished among the species in section Arvenses by its relatively large sporocarps (110-180 mm in diameter), erect floccose squamules on the surface of the stipe, and relatively small basidiospores (less than 6.5 lm long). Phylogenetic analyses based on ITS sequence data using maximum likelihood, parsimony, and Bayesian analyses all support A. flocculosipes as being a distinct species within section Arvenses. The new taxon is potentially cultivatable as it is presumably heterothallic, exhibits extensive genetic diversity, and occurs in section Arvenses, a lineage that contains other edible cultivatable taxa such as Agaricus arvensis and Agaricus subrufescens.
Fungal Diversity, 2011
... Ruilin Zhao & Samantha Karunarathna &... more ... Ruilin Zhao & Samantha Karunarathna & Olivier Raspé & Luis A. Parra & Jacques Guinberteau & Magalie Moinard & André De Kesel & Gérard Barroso & Régis Courtecuisse & Kevin D. Hyde & Atsu K. Guelly & Dennis E. Desjardin & Philippe Callac ... ARP173 A. bernardi USA ...
Fungal Biology, 2011
The button mushroom Agaricus bisporus commercially cultivated requires 16e19 C during the fruitin... more The button mushroom Agaricus bisporus commercially cultivated requires 16e19 C during the fruiting period. Wild strains are also present in natural habitat, and in light of their wide range of geographic distribution reported, from boreal region to tropical region, questions on the development adaptation to temperature arose. Isolates from various geographic areas were screened for their ability to fruit at higher temperature (FHT ability) than commercial cultivars. The FHT trait discriminated at the varietal rank. Agaricus bisporus var. eurotetrasporus was unable to develop any sporophores whilst A. bisporus var. burnettii adapted perfectly to 25 C for fruiting, suggesting that the FHT ability is a fixed trait in these varieties. In contrast, FHT ability of A. bisporus var. bisporus appeared variable and correlated neither with climate/microclimate nor with habitat. However, FHT ability taken as a whole appeared higher in North American populations than in European ones. Some A. bisporus var. bisporus isolates revealed a good potential for cultivation at 25 C.
Cryptogamie, Mycologie, 2012
-Une description, des dessins, et des photographies en couleurs d'Agaricus megalosporus, une espè... more -Une description, des dessins, et des photographies en couleurs d'Agaricus megalosporus, une espèce nouvelle, sont présentés. La nouveauté de cette espèce est supportée à la fois par sa morphologie et par une analyse phylogénétique. A. megalosporus se caractérise par ses sporophores de taille moyenne ou grande, un stipe fortement fibrillosquamuleux et des basidiospores relativement grandes. L'analyse de séquences ITS par maximum de vraisemblance, maximum de parcimonie non pondérée et analyse Bayesienne démontre que A. megalosporus appartient à la section Minores.
Komsit Wisitrassameewong 1,2 , Samantha C. Karunarathna 1,2 , Naritsada Thongklang 1 , Ruilin Zha... more Komsit Wisitrassameewong 1,2 , Samantha C. Karunarathna 1,2 , Naritsada Thongklang 1 , Ruilin Zhao 3 , Philippe Callac 4 , Ekachai Chukeatirote ... Holotype, Pile of leaves, Peck CH 1893, Deeply hemispherical, becoming convex or plano-convex, whitish, grayish or dull reddish ...
The invention concerns intraspecific hybrids of Agaricus bisporus capable of bearing fruit at rel... more The invention concerns intraspecific hybrids of Agaricus bisporus capable of bearing fruit at relatively high temperature and without roughing-in, and the method for obtaining them consisting in a step of cross-breeding in particular between a first and a second Agaricus bisporus, one of which at least belongs to theburnettii variety, and a step of selecting the resulting hybrids having the characteristics mentioned above. The cultivation of the resulting hybrids is easier and less expensive than the standard method of cultivating mushrooms.
The complete sequence of the mitochondrial cox1 gene, encoding the largest subunit of the cytochr... more The complete sequence of the mitochondrial cox1 gene, encoding the largest subunit of the cytochrome oxidase of the Basidiomycota Agaricus bisporus has been achieved. It has the longest cox1 gene (29,902 nt) with the largest number of group I introns (18 group I introns) reported to date in any eukaryote. The group I introns in the A. bisporus cox1 gene are similar to those reported in other Basidiomycetes includeing: 3 of the 4 introns in Agrocybe aegerita, 7 of the 9 introns in Pleurotus ostreatus, 3 of the 6 introns in Moniliophthora perniciosa, and 10 of the 15 introns in Trametes cingulata. constituting 18 of the 23 introns described in all Basidiomycota available genes, Moreover, the A. bisporus cox1 gene possesses two introns specifically reported in this gene (iAbi1 and iAbi14) and one intron (iAbi 18) possessing orthologous sequences only in the Ascomycota phylum but unknown to date in the Basidiomycota. Hence, A. bisporus cox1 gene contains three-quarters (18/24) of the fu...
Scientific Reports
In a recent revision of the genus Agaricus, A. section Xanthodermatei was split into two sections... more In a recent revision of the genus Agaricus, A. section Xanthodermatei was split into two sections A. sect. Hondenses and A. sect. Xanthodermatei. Our objectives were to investigate the species diversity of both sections in Pakistan and to give an overview of the major clades. Phylogenetic analyses based on the combined nucLSU, ITS and TEF1 dataset from 35 specimens of both sections revealed three major clades. Analyses based on ITS dataset and 106 specimens, including 33 from Pakistan, reveal eight new species and one new record species. These nine species are described in detail. It is noteworthy that intraspecific variability as well as interspecific variability between closely related species were very low in ITS sequences in many cases. In the case of the two new species A.xanthochromaticus and A.griseovariegatus, TEF1 sequence data were much more efficient than ITS to distinguish these species from each other. The other new species are A.atroumbonatus, A.fumidicolor, A.macropep...