ISSN 2285-5785, ISSN CD-ROM 2285-5793, ISSN ONLINE 2285-5807, ISSN-L 2285-5785

The uses of wild species Helianthus argophyllus for obtaining sunflower germplasms with improved resistance to drought and broomrape infestation -

Published in Scientific Papers. Series A. Agronomy, Vol. LV-2012
Written by Elena PETCU, Maria JOIŢA-PĂCUREANU

In this paper we present the results from the study on new sunflower forms obtained through hybridization between cultivated sunflower (Helianthus annuus) and wild species Helianthus argophyllus. The aim was to improve drought and broomrape resistance of some Romanian sunflower inbreed lines. The investigation encompassed the period 2008­2011. Interspecific F1 plants were obtained by embryo rescue techniques, and than as a results of and back-crossing and selfpollination with cultivated sunflower, BC4F2 was obtained. The heritability in first generation was intermediate but the plants strongly resembled the wild species in their most morphological traits. For drought resistance we selecting the plant with pubescent leaves. The BC2, BC3 and BC4 were assayed in vegetation house for broomrape resistance with tests performed with artificial inoculation using broomrape seeds collected from two infested areas with broomrape (F and G races). Concerning drought and broomrape resistance the results indicated good resistance, suggesting successful of gene introgression. Resistant lines will be selfpollinated and retested in the next year and some of the obtained hybrid forms will be included in a sunflower breeding program as genetic sources for drought and broomrape resistance.

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