Laboratory Versus Field Response of Potato Genotypes to Oxidant Stress

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Abstract
Foliar resistance to 26 potato (S. tuberosum) cultivars and genotypes from a 7-parent diallel to oxidant stress was assessed after exposure either to 774 .mu.g/m3 ozone for 3 h under laboratory conditions at University Park, Pennsylvania [USA] or to ambient oxidants at New Brunswick, New Jersey. Controlled ozone exposures provided a reliable method for identifying resistance to oxidant stress that would be effective over a range of field environments. Genotypes that were relatively susceptible to ozone in laboratory tests often appeared resistant to oxidant injury in the field, but genotypes susceptible to oxidant stress in the field were also susceptible in the laboratory. The mode of inheritance of resistance to ozone, as indicated by the relative importance of general and specific combining ability in the diallel analysis, varied among laboratory and field experiments.

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