Leveillula, G. Arnaud, 1921
publication ID |
https://doi.org/ 10.11646/phytotaxa.260.3.6 |
persistent identifier |
https://treatment.plazi.org/id/0392586F-9D03-FFF6-FF10-FB9DFBBEFA03 |
treatment provided by |
Felipe |
scientific name |
Leveillula |
status |
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Leveillula View in CoL View at ENA on Tropaeolum majus L.
Recently published taxonomic manual of the Erysiphales by Braun and Cook (2012) assigned Leveillula on Tropaeolum as Leveillula tropaeolicola T.Z. Liu & U. Braun. We examined one new collection and one specimen deposited at Herbarium of IRAN (Iranian Research Institute of Plant Protection, Tehran). According to our observation morphology of this fungus is different from what described by Braun and Cook (2012) for L. tropaeolicola . Phylogenetic analysis based on ITS rDNA ( Fig. 1 View FIGURE 1 ) showed that this fungus belongs to an already described phylogenetic group including Leveillula on Medicago sativa . More interestingly primary conidium morphology of this fungus more or less agreed with Medicago fungus. In both fungi primary conidia are subcylindrical with parallel side which pointed at apex ( Fig. 4 View FIGURE 4 ). ITS rDNA sequence was 100% identical to the ITS rDNA sequences obtained from Medicago powdery mildew from Iran ( Khodaparast et al. 2012). Hence, we conclude that powdery mildew on Tropaeolum in Iran differs from species described by Braun and Cook (2012) on this host plant. The occurrence of more than one morphologically or molecularly distinguished species on a single host is not uncommon as shown for Helianthus and Eryngium ( Khodaparast et al. 2012) . On the other hand, morphology of L. tropaeolicola is very close to L. taurica . Hence, we suggest that L. tropaeolicola may belong or closely related to a polyphagus race of L. taurica occurring on several unrelated plant species and our new collections belong to a different species.
Specimen examined. IRAN, East azarbaijan Province, Tabriz, on Tropaeolum majus L., 26 Aug 2009, M. Damadi
(GUM 681); IRAN, Alborz Province, Karaj, on T. majus ,?, Shahidi ( IRAN 2272 F) .
F |
Field Museum of Natural History, Botany Department |
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