Genetic applications in sunflower hybrid seed production
1986
Vranceanu, A. | Stoenescu, F. (Institutul de cercetari pentru cereale si plante tehnice, Fundulea (Romania))
Results of genetic research which aim at solving the main difficulties ecountered in sunflower hybrid seed production, on the basis of cytoplasmatic, male sterility are presented. The appearance of the male fertile plants in the cms inbreds (A) is determined by the recessive genes or polygenes located in the genotypes of their maintainers (B). The smaller the number of these genes is the more fertile plant appearance is noted in earlier backcross generations,2048and viceversa, So, the pollen fertility appearance in BC1 is controlled by two or three complementary recessive genes, while in advanced backcrosses the break-sterility is the result of the polygene concentration in the maintainer genotypes, which is quite different from plant to plant. This fact suggests the necessity of individual selection. Repeated promotion of A x B individual plant crosses with entire sterile offsprings has proved to be very efficient for reducing to minimum the ratio of fertile individuals in the frame of cytoplasmatic male sterile inbreds. The conversion of one headed restorers into recessive branched restorers could solve the problem of blooming nicking of the parental inbreds in hybridization pl
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