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#F1

2 public questions tagged with this topic.

Plant Breeding 2

Standard heterosis compares F1 with:

Standard heterosis often called economic or useful heterosis compares F1 hybrid performance with widely grown standard check variety representing commercial benchmark adapted to target environment and market preference. Computation F1 minus check divided by check times 100 indicates practical gain farmer could realize by replacing current cultivar. Check variety possesses proven stability, disease resistance genes and grain quality attributes. Therefore standard heterosis integrates agronomic superiority beyond parental mean, reflecting real market competitiveness. Indian Council Agricultural

Ref: ICAR Guidelines Hybrid Release Standard heterosis; Singh BD Economic heterosis; Crop Sci Standard check comparison definition.

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Plant Breeding 2

Superiority of F1 over mid-parent is called:

Relative heterosis, also termed mid-parent heterosis, quantifies superiority of F1 over average performance of its two parents. Mathematically calculated as difference between F1 and mid-parent value MP equals mean of P1 and P2 divided by MP multiplied by 100 to express percentage. Positive estimates indicate dominance and additive by additive interactions aggregating across quantitative trait loci governing yield components, chlorophyll content and stress tolerance. Mid-parent represents expected additive performance under no dominance, so deviation signals non-additive gene action. Although

Ref: Falconer Intro Quantitative Genetics heterosis definitions; Singh BD Relative heterosis formula; Acquaah Chapter Heterosis metrics.

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