Inheritance of resistance to two races of sunflower downy mildew (Plasmopara halstedii) in two Helianthus annuus L. lines |
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| Authors: | M L Molinero-Ruiz J M Melero-Vara J Domínguez |
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| Institution: | (1) Department of Crop Protection, Instituto de Agricultura Sostenible, CSIC, Apdo. 4084, E-14080 Córdoba, Spain;(2) Department of Breeding and Agronomy, CIFA-Córdoba, Apdo. 3092, E-14080 Córdoba, Spain |
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| 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 and770 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 × DM4suggested 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 703also 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 Pl
9, whereas Pl
v is tentatively proposed to designate the gene in DM4 responsible for resistance to races310 and 703.
This revised version was published online in August 2006 with corrections to the Cover Date. |
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| Keywords: | Helianthus annuus L Plasmopara halstedii downymildew resistance genes sunflower |
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