A leaf spot of figwort ( Scrophularia ningpoensis ) caused by Phoma sp
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چکیده
A leaf spot of figwort (Scrophularia ningpoensis) caused by Phoma sp. Abstract: Since 2006, a new disease caused by Phoma sp. has been identified on figwort (Scrophularia ningpoensis) in Hubei province, China. The pathogen was isolated from diseased S. ningpoensis leaves growing under field conditions, and attempts were made to identify it by cultural and morphological characteristics as well as analysis of the internal transcribed spacer region of ribosomal DNA. There were no identical matches of the DNA sequence on GenBank (highest match less than 98% identity), and morphological and cultural characteristics placed it closely with Phoma congesta, but the host species did not match. Another two species with striking similarities, P. pooiensis and P. nebulosa, are also found on Scrophulariaceae, but there were significant morphological or cultural differences from these species. Pathogenicity of the isolate was tested by inoculating 20 S. ningpoensis plants under greenhouse conditions. Koch's postulates were fulfilled by re-isolating the pathogen from the inoculated plants. This is the first report of leaf spot of S. ningpoensis caused by Phoma sp., but the exact species remains to be determined. Résumé: Depuis 2006, une nouvelle maladie, causée par Phoma sp., a été identifié sur la scrofulaire (Scrophularia ningpoensis) dans la province chinoise de Hubei. L'agent pathogène a été isolé à partir de feuilles infectées de S. ningpoensis prélevées en champ. Des tentatives d'identification basées sur les caractéristiques culturales et morphologiques ainsi que sur l'analyse de l'espaceur transcrit interne de l'ADN ribosomal ont été faites. Il n'y avait aucune concordance identique de la séquence d'ADN dans la base de données GenBank (le taux de concordance le plus élevé était inférieur à 98 %), et les caractéristiques morphologiques et culturales le rapprochaient de Phoma congesta, mais l'espèce hôte ne concordait pas. Deux autres espèces très semblables, P. pooiensis et P. nebulosa, se trouvent également sur les scrophulariacées, mais elles comportent des différences significatives sur le plan morphologique et cultural. La pathogénicité des isolats a été testée en serre en inoculant 20 plants de S. ningpoensis. Les postulats de Koch ont été satisfaits en isolant de nouveau l'agent pathogène provenant de plants inoculés. Ce rapport est le premier faisant état du chancre noir du S. ningpoensis causé par Phoma sp., mais l'espèce précise reste à déterminer.
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