S-gene, Biology


The S-gene has been suggested to be a super gene complex with several linked genes. It is supposed to have at least six (may he more) closely-linked genes which determine length of style (gene G), surface of stigma (S), pollen incompatibility (I'), stylar incompatibility (I"), pollen size, and/or shape (P), and stamen height (A). Being closely linked they are inherited together but because of crossing over, can be separated. In addition heteromorphic incompatibility can be further characterized by-

  • Saprophytically -determined incompatibility reaction,
  • Inhibited growth of incompatible pollen tube in the style, and
  • Expression of dominance between alleles of the incompatibility genes in both, pollen and style.
Posted Date: 1/23/2013 4:52:47 AM | Location : United States

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