Melon-powdery mildew interactions reveal variation in melon cultigens and Podosphaera xanthii races 1 and 2

By J. McCreight. 2006

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Powdery mildew is a serious disease of melon (Cucumis melo L.) worldwide. Twenty-two melon cultigens have been used to defi ne 22 reported races of the pathogen Podosphaera xanthii (sect. Sphaerotheca) xanthii (Castag.) U. Braun & N. Shish. Comb. nov. (syn. Sphaerotheca fuliginea (Schlecht. ex Fr.) Poll.). Discrepancies in the reactions of eight cultigens to populations of P. xanthii races 1 and 2 in California, Japan, and Spain revealed genetic differences among them that can be used to differentiate P. xanthii race 1 and 2 populations in these countries. Implicit in these results is the existence of previously unknown virulence factors in these populations of P. xanthii races 1 and 2 that permit designation of new races of P. xanthii on melon. Synthesis of these results with previous reports resulted in the identifi cation of 28 putative races of P. xanthii on melon that include eight variants of race 1 and six variants of race 2. Six of the cultigens exhibited resistant blisters in response to heavy infection by P. xanthii in fi eld and greenhouse tests. Powdery mildew affects yield and quality of melon worldwide. The disease is primarily caused by two fungal species: Podos- phaera xanthii and Golovinomyces cichoracearum (D.C.) Huleta (syn. Erisyphe cichoracearum auct. p.p.) (Jahn et al., 2002). Twenty-two races of P. xanthii and two races of G. cichoracearum

Subfields: Ecology, Evolution, Behavior and Systematics, Plant Science

View Paper: https://www.semanticscholar.org/paper/cf1ef91525f8b65f23e7812616da4811d70f92e4

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In Plant Science

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