AN ANALYSIS OF GENETIC VARIABILITY IN YIELD AND QUALITY COMPONENTS IN SOUTH AFRICANS STRAWBERRY GERMPLASM
The effects of propagation by crossing, selfing and cloning on the mean and variance of yield measurements was studied in 14 strawberry germplasm strains. The analysis of variance detected extremely high levels of genetic variance generated both by crossing and selfing, relative to cloning, in all measurements. Genetic variance between crosses was largely attributable to main effects of male and female parents in all traits excepting berry number and total yield where the analysis detected significant male x female interaction. The analysis of covariance of yield and quality measurements detected significant negative genetic covariance due to male and female effects in all cases excepting berry number and fruit colour. The comparison of progenies from crossing and selfing indicated heterosis and inbreeding depression for yield measurements, but not for quality measurements. However, the actual measurement of the degree of heterosis and inbreeding depression was confounded with unexpected depressed yields in clones as compared with seedlings of both crosses and selfs.
Human, Jan P. and Louw, Bill H. (1993). AN ANALYSIS OF GENETIC VARIABILITY IN YIELD AND QUALITY COMPONENTS IN SOUTH AFRICANS STRAWBERRY GERMPLASM. Acta Hortic. 348, 158-158