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The firmness of parthenocarpic (P) pickling cucumber cultivars is generally considered unacceptable for processing by the US pickling cucumber industry. Genetic improvement in firmness of P pickling cucumbers may increase their acceptability. Inheritance of fruit firmness (FF) in nonparthenocarpic (NP) cucumbers has been reported as quantitative but highly heritable with additive gene effects accounting for most of the genetic variation and no maternal effects. Genetic investigations were conducted at Brooks, Oregon, in 1992 and 1993 to determine the inheritance of FF in P cucumbers. High heritability for FF was found with most genetic variance attributed to additive gene effects when F 1 's from four P gynoecious inbreds as females and five NP monecious inbreds as males were used in 1992. Experiments in 1993, with inbred derived populations, revealed that dominant variance and maternal effects for FF may be substantial in certain populations with parthenocarpic germplasm.

447 PB 282 INHERITANCE OF FRUIT FIRMNESS IN GENETICALLY PARTHENOCARPIC PICKLING CUCUMBERS