Skip to content
Login Register

#breeding

2 public questions tagged with this topic.

Plant Breeding 4

Co-dominant markers are preferred in MAS because they:

Codominant markers reveal both alleles at locus simultaneously, displaying two distinct bands in heterozygote versus one band in each homozygote on gel or capillary electropherogram. This dosage information is invaluable in marker-assisted breeding because breeder can identify heterozygous carriers Aa that contain one copy of recessive or dominant donor allele while retaining recurrent background, and distinguish from homozygous donor AA that may exhibit drag penalty or lack recurrent adaptation. In backcrossing, BC progeny segregate 1:1 Aa:aa, and only heterozygous carrier advances, allowing

Ref: Collard BCY & Mackill DJ 2008 Marker-assisted breeding review: co-dominant heterozygote detection. Euphytica

View Details
Plant Breeding 2

Inbreeding depression is highest in:

Magnitude of inbreeding depression correlates inversely with natural selfing rate. Cross-pollinated crops like alfalfa Medicago sativa, carrot Daucus carota and squash Cucurbita pepo naturally outbreed, maintaining high heterozygosity and sheltering many recessive deleterious mutations protected from selection. Forced selfing uncovers this hidden load causing severe biomass reduction, flower abortion and sometimes lethality. Self-pollinated crops like wheat, rice and chickpea evolved under chronic selfing, exposing recessive alleles each generation and allowing purging selection to eliminate s

Ref: Allard Principles Plant Breeding mating system depression; Nature Reviews Inbreeding in crops; Singh BD classification cross vs self.

View Details