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Published in Crop Sci 9:262-264 (1969)
© 1969 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Genetic Variation in Maize Coleoptile Growth and its Relationship to the Auxin Regulatory System1

R. H. Moll, C. S. Levings, III and C. W. Stuber2

Part of the variability of coleoptile elongation in a population of maize (Zea mays L.) was found to be due to genotypic differences. Genotypic differences were also found for five traits related to the auxin regulatory system. These five traits were (1) auxin production of corn coleoptile tips measured by Avena bioassay, (2) elongation of corn coleoptile sections without exogenous auxin, (3) elongation with exogenous auxin, (4) response to exogenous auxin measured by the differences between (3) and (2) above, and (5) peroxidase activity. Regression of coleoptile length after 5 days on the traits chosen to represent the auxin regulatory system resulted in a significant reduction in the sum of squares, and a coefficient of determination of 0.425.

Key Words: Hormone response • Indoleaceatic acid • Peroxidase activity • Growth regulation

1 Joint contribution of the Department of Genetics, North Carolina Agricultural Experiment Station, Raleigh 27607, and the Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture. Paper No. 2706 of the Journal Series. The work was supported in part by Public Health Service Research Grant GM 11546 and in part by Cooperative Agreement No. 12-14-100-5623(34) between the North Carolina Agr. Exp. Sta. and Crops Research Division, ARS, USDA.

2 Professor and Associate Professor of Genetics, and Research Geneticist, Crops Research Division, ARS, USDA, respectively.

Received for publication August 29, 1968.




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