Chapter 9 Breeding Cross-Pollinated and Clonally Propagated Crops
Chapter 9 Breeding Cross-Pollinated and Clonally Propagated Crops
Chapter 9 Breeding Cross-Pollinated and Clonally Propagated Crops
POLLINATED CROPS
Cultivar Development in Cross-pollinated
Species
Compared to self-pollinated species, cross-
pollinated species differ in their gene pool
structure, and in the extent of genetic
recombination
Cross-pollinators
evaluate selfed offspring (if possible) No C.A.)
evaluate test cross offspring (Measure combining ability)
homozygous line tester (specific combining ability)
heterogeneous population tester (general combining ability
RECURRENT SELECTION
PRINCIPLE
3. season
A is less A. Composite seed B. Composite remnant
efficient than from superior seed from plants with
B progenies superior progenies
Source population
Superior plants selected
Half-sib
selection
with
testcross
Tester can
be more or
less
uniform
Measures specific
combining ability
between selected
plants
Selection from
S1 progeny
offspring test
Only if selfing
is possible