Euphytica (2003) 131, 47-51

M.L. Molinero-Ruiz, J.M. Melero-Vara and J. Domínguez (2003)
Inheritance of resistance to two races of sunflower downy mildew (Plasmopara halstedii) in two Helianthus annuus L. lines
Euphytica 131 (1), 47-51
Abstract: Sunflower downy mildew caused by Plasmopara halstedii is an important disease of sunflower capable of causing losses of more than 80% of production. Races 100, 300, 310, 330, 710, 703, 730 and 770 of the fungus have been identified in Spain. Race 703, of high virulence, has been identified frequently in the northeast, while race 310 seems to occur over the south, the main sunflower growing region of the country. Oil sunflower lines RHA-274 and DM4 were studied for their resistance to races 310 (RHA-274 and DM4) and 703 (DM4). In each cross, only one plant of the resistant parent was crossed to the inbred susceptible line HA-89 (or cmsHA-89). Plants from F₂ and backcross (BC₁F₁ to susceptible parent) generations were evaluated for fungal sporulation on true leaves and/or cotyledons. The resistant-to-susceptible ratios obtained in the F₂ and BC₁F₁ progenies from the crosses cmsHA-89 × RHA-274 and HA-89 × DM4 suggested that one major gene in each line is responsible for resistance to race 703. The segregations of the progenies of the cross HA-89 × DM4 inoculated with race 703 also fitted the ratios 1:1 and 3:1 (for BC₁F₁ and F₂, respectively) corresponding to control of resistance by a single dominant gene. In RHA-274, the gene for resistance to race 310 was designated Pl9, whereas Plv is tentatively proposed to designate the gene in DM4 responsible for resistance to races 310 and 703.
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Link to article at publishers website
Database assignments for author(s): Juan Dominguez

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Plasmopara halstedii	Sunflower (Helianthus annuus)	Spain (continental)