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


Published in Scientific Papers. Series A. Agronomy, Vol. LXVI, Issue 1
Written by Emilian ONISAN, Ioan SARAC, Irina PETRESCU, Camen DORIN

Sunflower cultivation is particularly important for vegetable oil production worldwide. Therefore, breeding programs have intensified research and development to increase yields by producing F1 hybrid seeds from crosses of inbred lines through the introduction of cytoplasmic androsterility. For the experiment, we used sterile sunflower inbred lines and restorer inbred lines to isolate the restorer gene in a segregation ratio of 1:2:1 in self-fertilization and 1:1 in backcrossing with PET1-type cytoplasm. The results of our research offer breeders the possibility of achieving greater dynamics in the development of inbred lines, the introgression of genetic resistances to sunflower diseases and the stimulation of a greater number of genotypes to increase the combined capacity of sunflower inbred lines. This was achieved by reducing the breeding program from three inbred lines to two inbred lines using sterility genes and heterozygous fertility genes. The use of segregating restoration genes on sterile cytoplasm enables the breeder to form valuable genotypes, adapt quickly to new herbicide technologies and efficiently introduce resistance genes to new disease nomenclatures.

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