The genetics of cotton - Part XIII. A third series of experiments with the crinkled dwarf mutant ofG. barbadense L. the crossBarbadense crinkled ×Hirsutum crinkled
1. The cross betweenhirsutum crinkled (Type 9) andbarbadense crinkled gave inF2 a series of crinkleds ranging from an extreme and exaggerated type of crinkled (super-crinkled) to a type phenotypically indistinguishable from normal (pseudo-normal). In later generations several new types of crinkled were extracted in homozygous form.
2. It is considered thatG. barbadense andG. hirsutum possess dissimilar modifier complexes, which in the interspecific cross are broken down, leading to the production of a varying series of genotypical backgrounds upon which the crinkled mutant manifests itself in a corresponding series of reactions, some favourably and others unfavourably.
3. The conversion of the crinkled mutant to pseudo-normal by genic recombination resulting from the interaction ofbarbadense andhirsutum modifiers favours Fisher’s view that recessives may ultimately become merged in the wild type by accumulating modifiers.
4. A new method for the production of duplicate genes is suggested.
Volume 100, 2021
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