Inheritance in Sweet Corn for Resistance to Acute Ozone Injury1

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Abstract
A high degree of inheritance for resistance and susceptibility in sweet corn (Zea mays L.) to acute ozone leaf injury under field conditions was shown during 2 and 3 generations of breeding with 3 series of cultivars. Crosses of highly susceptible × resistant inbreds gave notably susceptible F1's. F2 families segregated quantitatively but extremes were sometimes recovered. Distribution in F2 was skewed toward low injury. Resistant X resistant crosses gave almost fully resistant F1's and F2's. A study involving a second series of inbreds also showed a close relationship between susceptibility in a parent and in its derived F1's. Three generations of selection and inbreeding, beginning with a segregating population, resulted in near fixation in resistant sublines but showed continued segregation in progenies from susceptible selections.

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