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Complex segregation analysis of Gerbera flower colour

K R Tourjee¹, J Harding, T G Byrne

¹Department of Environmental Horticulture, University of California, Davis 95616.

|March 1, 1995

Summary

Genetic analysis of gerbera flower hue revealed a major gene controlling color, explaining most of the variation. This finding aids in understanding gerbera genetics and breeding for specific flower colors.

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Area of Science:

Plant genetics
Quantitative genetics
Horticultural science

Background:

Flower hue in gerbera (Gerbera jamesonii) populations exhibits a bimodal distribution.
This suggests a genetic basis involving major and minor genes.
Understanding the genetic architecture of flower color is crucial for breeding programs.

Purpose of the Study:

To investigate the genetic control of flower hue in the Davis population of Gerbera jamesonii.
To identify major genes influencing hue and quantify their contribution to variation.
To apply complex segregation analysis (CSA) for genetic modeling.

Main Methods:

Complex segregation analysis (CSA) was employed on pedigree data from generations 14, 15, and 16.
CSA utilizes pedigree analysis and transmission probabilities to optimize genetic models.
Genotypic values for homozygotes and heterozygotes were estimated.

Main Results:

A putative dominant major gene controlling flower hue was identified.
Genotypic values were estimated as 32 for dominant homozygotes/heterozygotes and 71 for recessive homozygotes.
This major gene accounts for 0.66 (66%) of the total hue variation.

Conclusions:

A single dominant gene significantly influences gerbera flower hue, aligning with the observed bimodal distribution.
The identified major gene is the primary determinant of hue variation in this population.
Further genetic studies can refine understanding of minor gene effects and breeding strategies.

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