Abstract
Somatic hybrids between Helianthus annuus and H. maximiliani obtained through two different hybridization methods were investigated. Random amplified polymorphic DNA markers of symmetric somatic hybrids (SSH) showed typical profiles of full somatic hybrid plants, while in asymmetric somatic hybrids (ASH) a small amount of alien genome was identified. Flow cytometric analysis of the genome size showed a strong correlation (r=0.92) between chromosome number and relative DNA content of the hybrid plants. Chromosome analysis of SSH and ASH showed a variable number of extra chromosomes in addition to the normal parental set (2n=34). In SSH the number of added chromosomes ranged from 26 to 31, while in ASH two to six additional chromosomes could be observed. Although the SSH and ASH plants varied largely in their genome constitution, both hybrid plant groups, to different degrees, were a genomic recombination of H. maximiliani and H. annuus, and some of these plants will be of use for practical breeding purposes.
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