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| Gérard, P.R.; Husson, C.; Pinon; Frey, P.. |
| The aims of this study were, first, to compare the genetic and virulence diversity between populations of the rust fungus Melanipsora larici-populina on wild and cultivated poplar stands and, second, to investigate the influence of the presence of the alternate host of the pathogen, larch, on which its sexual reproduction occurs, on these diversities. Nine French M. larici-populina populations collected from poplar trees in autumn and four. populations collected from larch trees during the following spring were analyzed using both virulence factors and neutral markers. In all, 30 pathotypes were identified within the 13 populations studied. The pathotypic structure clearly distinguished the cultivated stands with high richness and complexity from the wild... |
| Tipo: Journal Article |
Palavras-chave: GENETIQUE DES POPULATIONS; ROUILLE; MALADIE DES PLANTES; POUVOIR PATHOGENE; DIVERSITE GENETIQUE; PATHOTYPE; HOTE ALTERNATIF; EPIDEMIOLOGIE BLACK POPLAR; DOMINANT MARKERS; POPULATION GENETICS; RUST EPIDEMICS. |
| Ano: 2006 |
URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2007e8ace244&uri=/notices/prodinra1/2007/03/ |
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| Barres, B.; Halkett, F.; Dutech, C.C.; Andrieux, A.; Pinon, J.; Frey, P.. |
| Dispersal has a great impact on the genetic structure of populations, but remains difficult to estimate by direct measures. In particular, gradual and stochastic dispersal are often difficult to assess and to distinguish, although they have different evolutionary consequences. Plant pathogens, especially rust fungi, are suspected to display both dispersal modes, though on different spatial scales. In this study, we inferred dispersal capacities of the poplar rust fungus Melampsora larici-populina by examining the genetic diversity and structure of 13 populations from eight European and two overseas countries in the Northern hemisphere. M. larici-populina was sampled from both cultivated hybrid poplars and on the wild host, Populus nigra. The populations... |
| Tipo: Journal Article |
Palavras-chave: ROUILLE; DISPERSION; PLANTE PATHOGÈNE; DIVERSITÉ GENETIQUE MELAMPSORA LARICI-POPULINA; POPULUS NIGRA. |
| Ano: 2008 |
URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2008b7cff2a9&uri=/notices/prodinra1/2009/02/ |
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| Frey, P.; Frutig, S.; Kaltenrieder, U.; Wetzel, J.. |
| In Switzerland with its 7.3 million inhabitants, about 200,000 people are working in the agricultural sector managing 66,000 farms. Between 1990 and 2000, the number of agricultural employees shrunk by 50,000 and more than 22,000 agrarian businesses were abandoned – mostly smallscale farms with less than 3 ha. The Emmental region is a part of Switzerland characterized by a high share of agriculture. Compared to other regions the proportion of rural inhabitants is still relatively high, the decline of farms is therefore below the figures of the rest of Switzerland. Nevertheless, as an effect of the structural change also in rural regions, the remaining farmers depend more and more on additional incomes and are looking for extra work in different branches.... |
| Tipo: Conference proceedings |
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| Ano: 2005 |
URL: http://library.wur.nl/ojs/index.php/frontis/article/view/1269 |
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| Duplessis, S.; Cuomo, CA; Lin, YC; Aerts, A.; Tisserant, E.; Veneault-Fourrey, C.; Joly, DL; Hacquard, S.; Amselem, J.; Cantarel, B.l; Chin, R.; Coutinho, P.M.; Feau, N.; Field, M.; Frey, P.; Gelhaye, É.; Goldberg, J.; Grabherr, M.G.; Kodira, C.D.; Kohler, A.; Kues, U.; Lindquist, E.A.; Lucas, M; Mago, R.; Mauceli, E.; Morin, E.; Murat, C.; Pangilinan, J.L.; Park, R.; Pearson, M.; Quesneville, H.; Rouhier, N.; Sakthikumar, S.; Salamov, A.A.; Schmutz, J.; Selles, B.; Shapiro, H.; Tanguay, P.; Tuskan, G.A.; Henrissat, B.; Van de Peer, Y.; Rouze, P.; Ellis, J.G.; Dodds, P.N.; Schein, J.E.; Zhong, S.; Hamelin, R.C.; Grigoriev, I.V.; Szabo, L.J.; Martin, F.. |
| Rust fungi are some of the most devastating pathogens of crop plants. They are obligate biotrophs, which extract nutrients only from living plant tissues and cannot grow apart from their hosts. Their lifestyle has slowed the dissection of molecular mechanisms underlying host invasion and avoidance or suppression of plant innate immunity. We sequenced the 101-Mb genome of Melampsora larici-populina, the causal agent of poplar leaf rust, and the 89-Mb genome of Puccinia graminis f. sp. tritici, the causal agent of wheat and barley stem rust. We then compared the 16,399 predicted proteins of M. larici-populina with the 17,773 predicted proteins of P. graminis f. sp tritici. Genomic features related to their obligate biotrophic lifestyle include expanded... |
| Tipo: Journal Article |
Palavras-chave: COMPARATIVE GENOMICS; PLANT PATHOGEN; BASIDIOMYCETE; EVOLUTION; RUST EVOLUTION. |
| Ano: 2011 |
URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20117dba1845&uri=/notices/prodinra1/2011/06/ |
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| Rinaldi, C.; Kohler, A.; Frey, P.; Duchaussoy, F; Ningre, F; Couloux, A.; Wincker, P; Le Thiec, D.; Fluch, S.; Martin, F.; Duplessis, S.. |
| To understand key processes governing defense mechanisms in poplar (Populus spp.) upon infection with the rust fungus Melampsora larici-populina, we used combined histological and molecular techniques to describe the infection of Populus trichocarpa X Populus deltoides 'Beaupre' leaves by compatible and incompatible fungal strains. Striking differences in host-tissue infection were observed after 48-h postinoculation (hpi) between compatible and incompatible interactions. No reactive oxygen species production could be detected at infection sites, while a strong accumulation of monolignols occurred in the incompatible interaction after 48 hpi, indicating a late plant response once the fungus already penetrated host cells to form haustorial infection... |
| Tipo: Journal Article |
Palavras-chave: OBLIGATE BIOTROPHIC PATHOGEN; EXPRESSED SEQUENCE TAGS; FOR-GENE SPECIFICITY; HYPERSENSITIVE RESPONSE; HYBRID POPLAR; DISEASE RESISTANCE; LEAF RUST; FLAX RUST; AVIRULENCE GENES; GENOMIC SEQUENCE. |
| Ano: 2007 |
URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20072887511d&uri=/notices/prodinra1/2011/04/ |
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