Buee M

References (2)

Title : Perigord black truffle genome uncovers evolutionary origins and mechanisms of symbiosis - Martin_2010_Nature_464_1033
Author(s) : Martin F , Kohler A , Murat C , Balestrini R , Coutinho PM , Jaillon O , Montanini B , Morin E , Noel B , Percudani R , Porcel B , Rubini A , Amicucci A , Amselem J , Anthouard V , Arcioni S , Artiguenave F , Aury JM , Ballario P , Bolchi A , Brenna A , Brun A , Buee M , Cantarel B , Chevalier G , Couloux A , Da Silva C , Denoeud F , Duplessis S , Ghignone S , Hilselberger B , Iotti M , Marcais B , Mello A , Miranda M , Pacioni G , Quesneville H , Riccioni C , Ruotolo R , Splivallo R , Stocchi V , Tisserant E , Viscomi AR , Zambonelli A , Zampieri E , Henrissat B , Lebrun MH , Paolocci F , Bonfante P , Ottonello S , Wincker P
Ref : Nature , 464 :1033 , 2010
Abstract : The Perigord black truffle (Tuber melanosporum Vittad.) and the Piedmont white truffle dominate today's truffle market. The hypogeous fruiting body of T. melanosporum is a gastronomic delicacy produced by an ectomycorrhizal symbiont endemic to calcareous soils in southern Europe. The worldwide demand for this truffle has fuelled intense efforts at cultivation. Identification of processes that condition and trigger fruit body and symbiosis formation, ultimately leading to efficient crop production, will be facilitated by a thorough analysis of truffle genomic traits. In the ectomycorrhizal Laccaria bicolor, the expansion of gene families may have acted as a 'symbiosis toolbox'. This feature may however reflect evolution of this particular taxon and not a general trait shared by all ectomycorrhizal species. To get a better understanding of the biology and evolution of the ectomycorrhizal symbiosis, we report here the sequence of the haploid genome of T. melanosporum, which at approximately 125 megabases is the largest and most complex fungal genome sequenced so far. This expansion results from a proliferation of transposable elements accounting for approximately 58% of the genome. In contrast, this genome only contains approximately 7,500 protein-coding genes with very rare multigene families. It lacks large sets of carbohydrate cleaving enzymes, but a few of them involved in degradation of plant cell walls are induced in symbiotic tissues. The latter feature and the upregulation of genes encoding for lipases and multicopper oxidases suggest that T. melanosporum degrades its host cell walls during colonization. Symbiosis induces an increased expression of carbohydrate and amino acid transporters in both L. bicolor and T. melanosporum, but the comparison of genomic traits in the two ectomycorrhizal fungi showed that genetic predispositions for symbiosis-'the symbiosis toolbox'-evolved along different ways in ascomycetes and basidiomycetes.
ESTHER : Martin_2010_Nature_464_1033
PubMedSearch : Martin_2010_Nature_464_1033
PubMedID: 20348908
Gene_locus related to this paper: 9pezi-d5g8f4 , 9pezi-d5gi84 , 9pezi-d5gph4 , tubmm-d5g4w2 , tubmm-d5g4w3 , tubmm-d5g4w6 , tubmm-d5g5r5 , tubmm-d5g8z4 , tubmm-d5g938 , tubmm-d5ga65 , tubmm-d5gcz1 , tubmm-d5giz0 , tubmm-d5gkr8 , tubmm-d5glm4 , tubmm-d5gnw0 , tubmm-dapb , tubmm-d5gfj1 , tubmm-d5gpf4 , tubmm-TmEst2 , tubmm-TmEst1 , tubmm-TmEst3 , 9pezi-a0a292py12 , tubmm-kex1

Title : The genome of Laccaria bicolor provides insights into mycorrhizal symbiosis - Martin_2008_Nature_452_88
Author(s) : Martin F , Aerts A , Ahren D , Brun A , Danchin EG , Duchaussoy F , Gibon J , Kohler A , Lindquist E , Pereda V , Salamov A , Shapiro HJ , Wuyts J , Blaudez D , Buee M , Brokstein P , Canback B , Cohen D , Courty PE , Coutinho PM , Delaruelle C , Detter JC , Deveau A , Difazio S , Duplessis S , Fraissinet-Tachet L , Lucic E , Frey-Klett P , Fourrey C , Feussner I , Gay G , Grimwood J , Hoegger PJ , Jain P , Kilaru S , Labbe J , Lin YC , Legue V , Le Tacon F , Marmeisse R , Melayah D , Montanini B , Muratet M , Nehls U , Niculita-Hirzel H , Oudot-Le Secq MP , Peter M , Quesneville H , Rajashekar B , Reich M , Rouhier N , Schmutz J , Yin T , Chalot M , Henrissat B , Kues U , Lucas S , Van de Peer Y , Podila GK , Polle A , Pukkila PJ , Richardson PM , Rouze P , Sanders IR , Stajich JE , Tunlid A , Tuskan G , Grigoriev IV
Ref : Nature , 452 :88 , 2008
Abstract : Mycorrhizal symbioses--the union of roots and soil fungi--are universal in terrestrial ecosystems and may have been fundamental to land colonization by plants. Boreal, temperate and montane forests all depend on ectomycorrhizae. Identification of the primary factors that regulate symbiotic development and metabolic activity will therefore open the door to understanding the role of ectomycorrhizae in plant development and physiology, allowing the full ecological significance of this symbiosis to be explored. Here we report the genome sequence of the ectomycorrhizal basidiomycete Laccaria bicolor (Fig. 1) and highlight gene sets involved in rhizosphere colonization and symbiosis. This 65-megabase genome assembly contains approximately 20,000 predicted protein-encoding genes and a very large number of transposons and repeated sequences. We detected unexpected genomic features, most notably a battery of effector-type small secreted proteins (SSPs) with unknown function, several of which are only expressed in symbiotic tissues. The most highly expressed SSP accumulates in the proliferating hyphae colonizing the host root. The ectomycorrhizae-specific SSPs probably have a decisive role in the establishment of the symbiosis. The unexpected observation that the genome of L. bicolor lacks carbohydrate-active enzymes involved in degradation of plant cell walls, but maintains the ability to degrade non-plant cell wall polysaccharides, reveals the dual saprotrophic and biotrophic lifestyle of the mycorrhizal fungus that enables it to grow within both soil and living plant roots. The predicted gene inventory of the L. bicolor genome, therefore, points to previously unknown mechanisms of symbiosis operating in biotrophic mycorrhizal fungi. The availability of this genome provides an unparalleled opportunity to develop a deeper understanding of the processes by which symbionts interact with plants within their ecosystem to perform vital functions in the carbon and nitrogen cycles that are fundamental to sustainable plant productivity.
ESTHER : Martin_2008_Nature_452_88
PubMedSearch : Martin_2008_Nature_452_88
PubMedID: 18322534
Gene_locus related to this paper: lacbs-b0cns1 , lacbs-b0cpl4 , lacbs-b0cr62 , lacbs-b0cr66 , lacbs-b0csq9 , lacbs-b0ct56 , lacbs-b0ctt5 , lacbs-b0cuw1 , lacbs-b0cv23 , lacbs-b0cxm7 , lacbs-b0cz37 , lacbs-b0czx3 , lacbs-b0d0z5 , lacbs-b0d4i0 , lacbs-b0d4j3 , lacbs-b0d5n6 , lacbs-b0d8k0 , lacbs-b0d263 , lacbs-b0dhh1 , lacbs-b0dkp6 , lacbs-b0dmr2 , lacbs-b0dmt4 , lacbs-b0dsx5 , lacbs-b0dt05 , lacbs-b0dtw4 , lacbs-b0du88 , lacbs-b0dsl6