Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 12:466-469 (1972)
© 1972 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Cold Tolerance in Adapted Maize Populations1

J. J. Mock2 and S. A. Eberhart3

We evaluated two U.S. Corn Belt maize (Zea mays L.) populations (BSSS2 and BSSS13) for percentage emergence, emergence index (emergence rate), and seedling dry weight in two different "cold" environments: early field planting and growth chamber at constant 1O.OC. Genotypic variances of the traits within environments were large, but genotype x environment interaction was large and significant so that parameter estimates ({delta}2g and h2) from data combined across environments were low. Genotypic correlations suggested that within a population the same, or very similar, genetic systems conditioned cold tolerance in both environments. These genes were independent of genes controlling stand and maturity under "normal" planting conditions. Predicted selection responses indicated field selection for cold tolerance would be more efficient.

Key Words: Early planting • Genotypic variance • Selection index

1 Contribution from the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa 50010, and Plant Science Research Division, Agricultural Research Service, U.S. Department of Agriculture, cooperating. Journal Paper No. J-7096 of the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa. Project No. 1836.

2 Assistant Professor of Agronomy. Iowa State University, Ames, Iowa.

3 Research Geneticist, Plant Science Research Division, ARS, USDA, and Professor of Agronomy, Iowa State University, Ames, Iowa.

Received for publication November 30, 1971.


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P. Revilla, R.A. Malvar, M.E. Cartea, A. Butron, and A. Ordas
Inheritance of Cold Tolerance at Emergence and during Early Season Growth in Maize
Crop Sci., November 1, 2000; 40(6): 1579 - 1585.
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