Presentation Transcript
Slide 1:Polygenic
transfer is generally not possible by simple backcross schemes HYBRIDIZATION
Slide 2:………..to combine resistance + other desirable characters of the second variety Pedigree method Variety 1 Variety 2 Susceptible
Poor quality
Tall
Low tillering
Large seeds
More pods Resistant
Good quality
Dwarf
High tillering
Moderate yielding
Small seeds
Less pods x Variety 3 Large seeds
More pods
Resistant
Good quality
Dwarf
High tillering
Slide 5:F2 densely planted
From each plant one seed is picked up and bulked
F3 densely planted
From each plant random seed is picked up and bulked
As in F3
As in F3
F6 space planted
100-500 plants with desirable characteristics harvested seperately.
Individual plant progenies grown
Weak and undesirable progenies eliminated
Desirable homozygous progenies are harvested in bulk
Individual plants may be selected in outstanding progenies showing segregation.
Preliminary yield trials with suitable check
Quality test
Coordinated yield trials
Seed increase Single Seed Descent Method