Inheritance of plant height in the dwarf mutant ‘Enana’ of safflower

Abstract

The dwarf safflower mutant ‘Enana’ has been developed from the cultivar ‘Rancho’ by chemical mutagenesis. The objective of the present research was to study the inheritance of plant height in crosses between ‘Enana’ and ‘Rancho’. Plants of both lines were reciprocally crossed and the F1, F2 and F3 generations were obtained. The evaluation of plant height in the F2 generation suggested the presence of a single locus controlling this trait. This was confirmed after the evaluation of 164 F2:3 lines, which revealed an F2 segregation fitting a 1:2:1 (dwarf: intermediate: standard) ratio. The locus was designated Dw. As the mutated allele was partly dominant over the wild‐type allele, the proposed genotype for ‘Rancho’ was dw dw, whereas that for ‘Enana’ was Dw Dw. Furthermore, a partial cytoplasmic effect on plant height was detected, with the heterozygote Dw dw being about 6 cm taller when ‘Rancho’ was used as female.

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