• The genetics of cotton - XVII. Increased mutability of a gene inG. purpurascens as a consequence of hybridization withG. hirsutum

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    • Abstract

       

      1. The geneSH (hirsutum petal spot) is slightly mutable somatically on (a) ahirsutum background, and (b) a background predominantlybarbadense.

      2. The geneSP (purpurascens petal spot) becomes increasingly mutable, both somatically and gametically,pari passu with the replacement ofpurpurascens byhirsutum genes.

      3. It is believed that species may possess modifier complexes, the effect of which is to preserve the stability of genes and prevent them from mutating at an excessive rate.Hirsutum andpurpurascens may be assumed to differ in the nature of such of their modifiers as affect the mutation rate ofSP.

      4. The genesSH andSP are members of the anthocyanin multiple allel series, and may be distinguished by the weaker manifestation ofSP in thehirsutum genotype.

      5. Other cases of mutability in interspecific hybrids are mentioned, and the possible significance to the plant breeder of mutability consequent on interspecific hybridization is referred to.

    • Author Affiliations

       

      Sydney Cross Harland1

      1. Instituto Agronomico do Estado de São Paulo, Campinas, Brazil
    • Dates

       
  • Journal of Genetics | News

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