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Abstract
Inheritance of the ability of tomato (Lycopersicon esculentum Mill.) to sprout at 10°C was evaluated in a diallel study involving 7 inbred parents. For each parental and F1 progeny family, sprouting indices were used to estimate genetic and environmental components of variation. Significant additive gene effects with partial dominance for inability to sprout at low temperature were found. Epistatic gene effects were not important, but a significant maternal effect was found. The estimate of narrow sense heritability was 69% and that for broad sense heritability was 85%.
Abstract
The inheritance of peroxyacetyl nitrate (PAN) resistance in Petunia hybrida Vilm. was studied using the inbred parents of ‘White Cascade’, a susceptible F1 hybrid, and ‘Coral Magic’, a resistant hybrid. In each of 6 experiments, 4-week-old plants of the parents, their reciprocal F1 hybrids, the F2 generation, and reciprocal backcross generations were simultaneously tested for PAN resistance. Plants were exposed to 742 μg/m3 (0.15 ppm) PAN for 1.5 hours in a controlled environment chamber. The percent area of bifacial necrosis was determined for each leaf on a plant and an average was calculated to yield an injury rating. Significant genetic variation was detected in each experiment, but the best fitting genetic model varied among experiments, indicating large genotype by environment interaction. In the experiment with the most severe PAN injury, genes for susceptibility exhibited almost complete dominance to those for resistance and epistatic effects were not significant. In other experiments with lower levels of PAN injury, resistance was partially dominant to susceptibility and one or more epistatic parameters were significant.