Host status and reaction of <Emphasis Type="Italic">Medicago truncatula</Emphasis> accessions to infection by three major pathogens of pea (<Emphasis Type="Italic">Pisum sativum</Emphasis>) and alfalfa (<Emphasis Type="Italic">Medicago sativa</Emphasis>) |
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| Authors: | Anne Moussart Caroline Onfroy Angelique Lesne Magali Esquibet Eric Grenier Bernard Tivoli |
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| Institution: | (1) Union Nationale Interprofessionnelle des Plantes riches en Protéines (UNIP), 12, avenue Georges V, 75008 Paris, France;(2) Unité Mixte de Recherche INRA/AGROCAMPUS ‚Biologie des Organismes et des Populations appliquée à la Protection des Plantes’ (BiO3P), INRA, Domaine de la Motte, B.P. 35327, 35653 Le Rheu Cedex, France |
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| Abstract: | Ditylenchus dipsaci, the stem nematode of alfalfa (Medicago sativa), Mycosphaerella pinodes, cause of Ascochyta blight in pea (Pisum sativum) and Aphanomyces euteiches, cause of pea root rot, result in major yield losses in French alfalfa and pea crops. These diseases are difficult to control
and the partial resistances currently available are not effective enough. Medicago truncatula, the barrel medic, is the legume model for genetic studies, which should lead to the identification and characterization
of new resistance genes for pathogens. We evaluated a collection of 34 accessions of M. truncatula and nine accessions from three other species (two from M. italica, six from M. littoralis and one from M. polymorpha) for resistance to these three major diseases. We developed screening tests, including standard host references, for each
pathogen. Most of the accessions tested were resistant to D. dipsaci, with only three accessions classified as susceptible. A very high level of resistance to M. pinodes was observed among the accessions, none of which was susceptible to this pathogen. Conversely, a high level of variation,
from resistant to susceptible accessions, was identified in response to infection by A. euteiches. |
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| Keywords: | Aphanomyces euteiches disease resistance Ditylenchus dipsaci germplasm evaluation model legume Mycosphaerella pinodes |
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