The inheritance of the character complex of naked grain and multiflorous spikelets was studied in a diallel set of crosses comprising five varieties of naked oats (Avena nuda)-As 78, Manu, Caesar, Nuprime and AJ86/2/1-and one variety of husked oats (A. sativa), Maris Oberon. In the F1 generation the distribution of multiflorous spikelets was in all cases similar to that of the mid-parent. Crosses between the varieties of A. nuda produced only naked grain on plants in the F1 and F2 generations, indicating that ‘nakedness’ in the varieties studied was determined by the same loci.
The three-gene model proposed by Moule (1972) for the determination of A. nuda characters was inadequate to account for the observed F2 segregation in naked x husked crosses. An extension of this model is proposed to include a third modifying gene, N3, which in the homozygous dominant condition produces the husked phenotype when the principal gene, N, is heterozygous. The model assumes complex epistatic relationships between the three modifying genes N1, N2 and N3. Published information and further experimental data suggest that the genotype NN--N3N3 is uncommon. The expression of the genes determining nakedness was greatly influenced by the environment.
Index wordsAvena nuda oats naked grain multiflorous spikelets genetics
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