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Inheritance of Pericarp Firmness in Tomato by Generation Mean Analysis1


Generation mean analysis (GMA) was used to study the inheritance of pericarp firmness in tomato (Lycopersicon esculentum Mill.) in 6 populations of the cross P 510 × 30-St-29A, a firm-fleshed hybrid released as ‘Show-Me.’ Firmness readings for the F1, F2 and backcross (BC) populations approached their respective midparental values. Mean firmness values (kg/0.283 cm2) for the soft parent, firm parent, F1, F2, BP1 (firm), and BP2 (soft) were 0.78, 1.48, 1.17, 1.10, 1.29, and 1.01, respectively. The coefficient of regression was significant at the 0.01% level of probability. GMA applied to the F2 population gave a mean estimate of 1.13, an additive estimate of 0.28 and a dominance estimate of 0.14 indicating strong additive gene action. The data fit the 3-parameter model indicating no significant digenic epistatic interaction.