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#bulk breeding

2 public questions tagged with this topic.

Plant Breeding 3

In bulk breeding, selection is practiced mainly in:

Natural selection predominates during early generations of bulk method, making artificial selection ineffective because heterozygosity buffers phenotypic expression and heritability of yield is low. Plants in F2-F4 still segregate, genotype-by-environment interaction confounds single plant performance, and competitive ability may not correlate with grain yield in pure stands. Breeders therefore postpone intensive selection until F5-F7, when inbreeding coefficient approaches 0.9375 and plants become largely homozygous. At this stage environmental fitness differences have already filtered malada

Ref: Acquaah G. Chapter 11 Bulk breeding; Poehlman & Sleper Breeding Field Crops, 5th ed.

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Plant Breeding 3

Bulk breeding method mainly relies on:

Bulk breeding creates a heterogeneous population after hybridization and allows natural selective forces to act over multiple selfing generations without intensive artificial culling. Seeds from F2-F5 are harvested in bulk and sown without pedigree tracking, exposing the population to prevailing biotic and abiotic stresses in target environment. Plants susceptible to disease, drought, lodging, or winter kill fail to contribute seed, while better adapted, disease-tolerant types increase in frequency through differential survival and reproductive success. This mimics Darwinian selection acting o

Ref: Suneson CA. Agronomy Journal 1956 – Bulk population breeding and natural selection. Allard Chapter 14

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