GENETIC VARIANCES AND CORRELATIONS AMONG FRUIT QUALITY CHARACTERISTICS IN A Lycopersicon. esculentum × L. pennellii BACKCROSS POPULATION.

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  • 1 Dept. of Horticulture, Univ. of Wisconsin, Madison, WI 53706
  • 2 H.J. Heinz, Stockton, CA 95201
  • 3 AgraDyne, Salt Lake City, UT 84108

An accession of the wild species of tomato, L. pennellii (Cor.) D'Arcy, LA 1077 is much more water-use efficient (WUE) than the cultivated tomato. The F1 hybrid between L. esculentum cultivar UC82 and LA 1077 was backcrossed to UC8 2 and selfed. S1 families (BC1S1) were evaluated for fruit quality characteristics at the Heinz Research Farm, Stockton, CA. Broad sense heritabilities were estimated as follows: Fruit weight, 0.52 ± .28; Soluble solids 0.56 ± .27; viscosity 0.63 ± .27; pH 0.43 ±.29 Color L 0.59 ± .27 and Color A/B ratio 0.50 ± .28. The following phenotypic correlations were observed in the BC1S1 generation between expression of soluble solids and fruit quality characteristics: Fruit weight (g), 0.15; viscosity, -0.65; pH -0.52; Color L, -0.53 and Color A/B ratio 0.02.

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