Heritability and genetic variance components for 20 fruit and plant characters were investigated in 64 progenies produced among 31 North American and 1 German strawberry clone under the crossing scheme similar to North Carolina Design II (Comstock and Robinson, 1952). The data were analyzed based on the assumption of random and/or mixed models of the parents. The estimation of the genetic variance components indicated that for more than half the 20 characters nonadditive variance (dominance + epistasis) constituted approximately 50% or more of the total genetic variance and that in most cases epistasis played an important role in the nonadditive variance. Heritability estimates were low (less than 18%) for total berry yield and some fruit quality characters such as firmness, easy capping, pH value, soluble solids, and external and internal appearances but were high (more than 37%) for a number of yield component characters such as average berry weight, berries/flower stalk, yield/flower stalk and flower stalk number, suggesting that substantial improvement in total berry yield could be achieved through selection on these yield components or a linear function of them.
Genetic, p!motypic and environmental correlations and coheritabilides berween ZR fru~t and plant characters were estimated in 64 progenia produced among 31. North American strawberry clones and 1 German one under the crossing scheme similar to North Carafina Desip 11. Total berry and total marketable yields were positively and significantly correlated with average berry weighr, hrries per flower stalk, yield per flower stalk, leaf area, and petiole diameter, but negativcly correlated wirh stolon number and flower stalk number. The invcrsc relationsIlips bctween flower stdk number with average berry weighr, and with berries pcr flower stalk may be genetically dependent or arise from dmIoprnentally induced relacionships. Plant height appeared to be a goad indicator of both early and early marketable yields; petiole number tvas considcrcd the bcsr indicaror of solubIe solids and easy capping, while soluble solids may be of value as an indicator of both late and late marketable yields. In general, no genetic barrier was detected to combine high yield with good quality of the berry.
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