Presentation Transcript
Slide 1:Monogenic / Oligogenic
Transfer HYBRIDIZATION
Slide 2:Susceptible
BUT high yielding resistant 50% 50% 75% 25 87.5% 93.75% 96.87% x x x x x F1 BC1 BC2 BC3 BC4 99.999 % GENERAL
Back-Cross Scheme to Transfer Resistance Genes Susceptible variety
converted to
Resistant Variety BC1F2 BC2F2 BC3F2 BC4F2 BCnF2 Year 1 Year 2 Year 3 Year 4 Year 5 Year 6 Year n
Slide 3:Dominant gene to transfer This is a breeding scheme to transfer a resistance gene (governed by dominant gene) in a susceptible variety (having recessive gene) which is otherwise high yielding i.e. this back cross scheme is to remove the defect of an existing highly adapted variety Year 1 Year 2 Year 3 Year 4 Year 5 Year 9 Year 10 Year 11
Slide 4:Dominant gene to transfer One
extra
year Another
extra
year Another
extra
year Almost double time taken