INBREEDING AND HETEROSIS IN AUTOTETRAPLOID ALFALFA. I. FERTILITY

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Abstract
Certain aspects in the quantitative genetics of autotetraploid populations have been developed into a deterministic model. The use of two mating systems, inbreeding and hybridization, on the fertility of two alfalfa clones gave results which were in close agreement with the proposed model. The interactions between more than two alleles, whether identical or not, were important in the expression of heterosis. Performance of hybrids became weaker and weaker as the parents were more and more inbred. It was possible to evaluate the influence of the various genotypic structures on seed setting.