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ESTIMATION OF GENETIC EFFECTS AND THE RELATIONSHIP OF ROOT MORPHOLOGICAL TRAITS TO VERTICAL-PULLING RESISTANCE IN MAIZE
Abstract
Seven inbred lines of maize were selected based on differences in root lodging resistance. All possible F1's, F2's and the backcross to both parents were made. The five generations were grown under both corn rootworm infested and noninfested environments. Data were obtained for the characters vertical-pulling resistance, root system size, root angle, number of brace roots, secondary roots, and corn rootworm damage rating. Significant, positive correlations were found between the parental lines, both in the presence and absence of corn rootworms, with their F1 hybrids in the presence of corn rootworms for vertical-pulling resistance and the number of brace roots. No significant correlation was found between the parental lines and their F1's for the other traits under study. Significant, positive correlations were found between vertical-pull and the number of brace roots and also between vertical-pull with root system size. A significant negative correlation was found between vertical-pull and corn rootworm damage rating. Mather and Jinks' (1971) generation means analysis was used to estimate the cumulative additive, dominance, additive x additive, additive x dominance and dominance x dominance genetic effects. Dominance was the most important effect for vertical-pulling resistance, root system size, and number of brace roots. Additive and dominance effects were approximately equal for root angle and secondary roots. Epistasis, though present for all traits, was of considerably smaller magnitude than the main effects.
Subject Area
Agronomy
Recommended Citation
HILE, GLENN C, "ESTIMATION OF GENETIC EFFECTS AND THE RELATIONSHIP OF ROOT MORPHOLOGICAL TRAITS TO VERTICAL-PULLING RESISTANCE IN MAIZE" (1986). ETD collection for University of Nebraska-Lincoln. AAI8704550.
https://digitalcommons.unl.edu/dissertations/AAI8704550