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- Author or Editor: E. J. Pell x
- Journal of the American Society for Horticultural Science x
Abstract
Greenhouse-grown ‘Kennebec’ and ‘Atlantic’ potato (Solanum tuberosum L.) plants were exposed twice-weekly for 5 hours to 380 μg·m−3 (0.2 ppm) NO2 throughout their growing season. NO2 accelerated the rate of leaf abscission and reduced tuber number, weight, and dry matter percentage. NO2 was absorbed by exposed plants, as reflected by an increase in leaf total N content, but did not affect the total glycoalkaloid (tga) status of potato foliage or tubers.
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.