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Parent-Offspring Popping Expansion Correlations in Progeny of Dent Corn x Popcorn and Flint Corn x Popcorn Crosses¹

Experiments were conducted to determine the potential for use of dent x popcorn (Zea mays L.) and flint x popcorn crosses as breeding material for popcorn improvement. Two popcorn inbreds were crossed to both a dent and a flint inbred and several F₁ plants from each cross were selfed. F₂ plants from each of the four crosses were grown in 1979, self-pollinated, and crossed to a single-cross popcorn tester. The ears from the F₂ plants were evaluated for popping expansion. The F₃ and test-cross families were grown in 1980 and evaluated for popping expansion. The popping expansion differences among the F₃ families from all four crosses were highly significant. Linear correlations between the F₂ and the F₃, and the F₂ and the test-cross popping expansions were determined, and all correlation coefficients were highly significant. In the correlations of the F₂ with the F₃ the two flint x popcorn crosses had coefficients of +0.84** (significant at the 0.01 level of probability) and +0.81**, which were the highest obtained, and the two dent x popcorn crosses had coefficients at +0.63* and +0.76*. These high correlations, and the significant differences among F₃ families, show that selection for popping expansion in F₂ ears would be effective in population improvement. F₃ families from the dent and flint corn crosses to one popcorn inbred had similar popping expansion means and ranges, indicating that popping expansion could be as easily recovered from crosses to dent corn as from crosses to flint corn.

Key Words: Zea mays L.

² Formerly graduate assistant (presently plant breeder, Blevins Popcorn Co., Inc., Ridgeway, IL 62979) and associate professor, Dep. of Botany and Plant Pathology, Purdue Univ., W. Lafayette, IN 47907.

Received for publication January 14, 1983.