Jean-Pierre Peros

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In grapevine, as in other fruit crops, fruit size and seed content are key components of yield and quality; however, very few Quantitative Trait Loci (QTLs) for berry weight and seed content (number, weight, and dry matter percentage) have been discovered so far. To identify new stable QTLs for marker-assisted selection and candidate gene identification, we(More)
Grapevine (Vitis vinifera subsp. vinifera) is one of the most important and ancient horticultural plants in the world. Domesticated about 8–10,000 years ago in the Eurasian region, grapevine evolved from its wild relative (V. vinifera subsp. sylvestris) into very diverse and heterozygous cultivated forms. In this work we study grapevine genetic structure in(More)
ABSTRACT Fifty-five isolates of Eutypa lata were collected in 1994 from a single vineyard, each from a different vine that showed either shoot and foliar symptoms of Eutypa dieback or only abnormalities during the period of 1990 to 1994. These isolates showed a large variation in pathogenicity after inoculation on cuttings in the greenhouse. Variability(More)
Erysiphe necator, the causative agent of powdery mildew in grapevine, was introduced into Europe from North America during the middle of the 19th century. Our objective was to analyze the genetic variation and the population structure of the fungus in southern France. The sample comprised 101 isolates and was mainly of flag shoot origin, i.e., infection of(More)
High-throughput re-sequencing, new genotyping technologies and the availability of reference genomes allow the extensive characterization of Single Nucleotide Polymorphisms (SNPs) and insertion/deletion events (indels) in many plant species. The rapidly increasing amount of re-sequencing and genotyping data generated by large-scale genetic diversity(More)
Eutypa lata is the causal fungal agent of Eutypa dieback, a serious grapevine necrotic disease. The erratic and delayed (1 to 2 months) appearance of characteristic conidia on culture media and the presence of numerous microorganisms in decaying wood make it difficult either to identify or to detect E. lata in grapevine wood samples. We designed six pairs(More)
Inheritance of nuclear microsatellite markers (nSSR) has been proved to be a powerful tool to verify or uncover the parentage of grapevine cultivars. The aim of the present study was to undertake an extended parentage analysis using a large sample of Vitis vinifera cultivars held in the INRA “Domaine de Vassal” Grape Germplasm Repository (France). A dataset(More)
Eutypa lata is an ascomycete fungus causing a severe dieback in grapevine. The genetic structure of populations of E. lata from seven regions in Australia, France, Italy and Spain was examined using 20 random amplified polymorphic DNA (RAPD) markers. In some regions, populations were subdivided and a total of 14 samples were analysed. A total of 231 RAPD(More)
As for many crops, new high-quality grapevine varieties requiring less pesticide and adapted to climate change are needed. In perennial species, breeding is a long process which can be speeded up by gaining knowledge about quantitative trait loci linked to agronomic traits variation. However, due to the long juvenile period of these species, establishing(More)
Young buds and leaf tissues of sugarcane cv. R 574 (a Saccharum hybrid), healthy or infected with Maize Streak Virus (MSV) were cultured in vitro. The success rate of the cultures from infected material is lower than that from healthy material. The symptoms of the disease were displayed on most of the plantlets produced from buds but only on 6% of the(More)