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Learn Introductory plant breeding with Braimy- B.Sc agriculture
About Lesson
  1. M1 and M2:
  • M1 and M2 are grown in the same way as in the case of oligogenic traits.
  • In M2, vigorous, fertile and normal looking plants that do not exhibit a mutant phenotype are selected and their seeds are harvested separately to raise individual plant progeny rows in M3.

  1. M3:
  • Progeny rows from individual selected plants are grown.
  • Careful observations are made on M3 rows for small deviations in phenotype from the parent variety.
  • Inferior rows are discarded. Few rows may be homogeneous and would be harvested in bulk.
  • Selection in done in M3 rows showing segregation; a majority of M3 rows would show segregation.
  • Intensive and careful evaluation of a large number of M3 progeny rows allows identification of mutants with altered quantitative traits.
  • g., partial or horizontal disease resistance. Such mutants occur in high frequencies that approach 1% or even high, so that their isolation becomes quite cost effective.

  1. M4:
  • Bulked seed from homogeneous M3 rows may be planted in a preliminary yield trial with a suitable check; superior progenies are selected for replicated multilocation yield trials.
  • Individual plant progenies from M3 are critically observed.
  • Progenies showing segregation may be subjected to selection only if they are promising.
  • Super ior homogeneous progenies are harvested in bulk for preliminary yield tests in M5.

  1. M5-M8:
  • Preliminary yield trials and / or multi-location trials are conducted depending upon the stage when the progenies become homogeneous.
  • Outstanding progenies may be released as new varieties.
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