Catherine Ravel

Research Field

• Variability in the fungal endophytes of 83 natural populations of Lolium perenne (perennial ryegrass) from Europe was assessed. • One plant per population was used for endophyte isolation and mycotoxin analysis. Variability in three isozymes, colony morphology and growth rate on potato dextrose agar (PDA), and synthesis of ergovaline, lolitrem B and peramine was recorded. • Three species were found among 94 strains isolated: Neotyphodium lolii, Neotyphodium sp. (LpTG-2) and Gliocladium-like. The most frequent species was N. lolii, which showed high variability. In 12 populations, a single plant harboured two different endophytes. One-third of the isolates of N. lolii did not produce ergovaline whereas a few isolates did not produce lolitrem B. Ergovaline and lolitrem B-deficient strains, but not the few peramine-deficient isolates, had characteristic morphologies on PDA. No isolate was deficient for both ergovaline and lolitrem B synthesis. • Selection of ergovaline and lolitrem-deficient strains based only on the morphology of the isolates in culture may be possible.

Neotyphodium

Endophyte

Potato dextrose agar

10.1046/j.0028-646x.2001.00231.x

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Citations (43)

Effects of ergovaline in forage grasses en feeding value and animal performances

HAL (Le Centre pour la Communication Scientifique Directe) (2000)

J. C. Emile Fabien Surault Sylvie Bony Catherine Ravel Marc M. Ghesquière

Value (mathematics)

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interview de M. Albessard pour sans transition "Faire que le pain retrouve de sa superbe"

Catherine Ravel

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reportage envoyé spécial "les mordus du pain

Catherine Ravel Sibille Perrochon

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Wheat EST‐SSRs for tracing chromosome segments from a wide range of grass species

Plant Breeding (2007)

L. Y. Zhang M. Bernard Catherine Ravel François Balfourier Philippe Leroy

Abstract Transferability of 116 common wheat expressed sequence tag–simple sequence repeats (EST‐SSR) markers was investigated on 168 accessions representing 18 grass species to identify new alleles useful for wheat improvement. Transferability among the Triticeae ranged from 73.7% for Aegilops longissima to 100% for wheat subspecies ( Triticum compactum ) but was also good for less related species such as rye (72.8%) or maize (40.4%). On average, the number of alleles/locus detected by EST‐SSR markers was 3.1 for hexaploid wheat. The polymorphism information content (PIC) values simultaneously estimated for Triticum aestivum and Triticum durum were similar for the two species (0.40 and 0.39, respectively). The allelic diversity within allogamous species was higher (0.352–0.423) compared with that of T. aestivum and T. durum (0.108 and 0.093, respectively). T. aestivum and T. durum shared the largest number of alleles (74.6%) while among the three ancestral diploid species of bread wheat, Aegilops tauschii had the highest percentage of alleles with T. aestivum (57.4%). These results indicate that grass orphan species can be studied using wheat EST‐SSRs and can serve as a source of new alleles for wheat genetic improvement.

Triticeae

Aegilops tauschii

Aegilops

Subspecies

Common wheat

Transferability

10.1111/j.1439-0523.2007.01293.x

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ExIGE : Évaluation multi-environnementale de blé tendre « exotique »prédictions génomiques GxE et génétique d'association-projet FSOV 2018 P

Justin Blancon Jonathan Kitt Pauline Lasserre‐Zuber David Álvarez Sibille Perrochon

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