Abstract

GIUSSANI, A.; CASTANO, F.  and  RODRIGUEZ, R.. Performance of six sunflower hybrids and derived inbred lines during white rot development in capitula. Agriscientia [online]. 2008, vol.25, n.1, pp.35-40. ISSN 1668-298X.

Six sunflower F1 cultivars and F2:3 lines, obtained from self-fertilization of these cultivars, were evaluated for white rot performance. Genotypes were inoculated with Sclerotinia sclerotiorum and the disease incidence, relative incubation period, disease severity -at 40 days after inoculation and at maturity- and daily growth lesion rate were quantified. There were different white rot performances for all variables and the cultivar MG 50 showed a high level of resistance for all variables, except incidence. Some derived F2:3 lines showed a similar level of resistance to that of the best cultivars. These lines are still in the inbreeding process and then crossed to detect hybrids with the most adequate level of resistance to white rot in sunflower capitula.

Keywords : Diseases; Genetic improvement; Inbreeding; Level of resistance; Selection.

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