Synthetic Variety

Synthetic Variety
  • The use of synthetic varieties for commercial cultivation was first suggested in maize(Hayes and Garber(1919).
  • A synthetic variety is produced by crossing in all combinations a number of inbreds(4-6) that combine well with each others.
  • The inbreds are tested for GCA. Synthetic is maintained by open pollination.
  • The lines that make up a synthetic may be usually inbred lines but open pollinated varieties, or other populations tested for GCA also used. Synthetic varieties are common in grasses, clover, maize and sugar beet.
  • The normal procedure is equal amounts of seeds from parental lines is mixed and planted in isolation.
  • Open pollination is allowed.

Features of Synthetic Variety

  • Heterogeneous
  • Synthetic variety can be developed by using clones, inbreds or OPV i.e. open pollinated variety
  • Cross pollination is must
  • Maintained by open pollination
  • Unlike composite variety, exact reconstitution of synthetic variety is possible
  • More adaptive to varying growing conditions as compared to hybrids
  • Less uniform as compared to hybrids
  • Less attractive as compared to hybrids
  • Show some amount of heterosis as compared to OPV
  • Have better disease resistance

Steps involved in synthetic variety

  • Development of synthetic varieties consists of 4 major steps.
  • Isolation of inbred lines
  • Evaluation of inbred lines for GCA
  • Intermating of good general combining inbreds in all possible combinations.
  • Mixing the seed of all F1 crosses in equal quantity

Last modified: Monday, 2 April 2012, 10:00 PM