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Broomrape (Orobanche cernua Loefl., syn. O. cumana Wallr.) populations belonging to a new race F in Spain have overcome all known resistance genes Or1 to Or5 in cultivated sunflower (Helianthus annuus L.) and are spreading rapidly. All hybrids currently grown in Spain are susceptible to race F, and sources of resistance genes for this race are needed to develop new resistant cultivars. The objective...
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