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Published in Crop Sci 11:787-789 (1971)
© 1971 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Quantitative Inheritance of Some Head and Seed Characteristics in Sorghum [Sorghum bicolor (L.) Moench]1

Mamdouh A. Fanous, Dale E. Weibel and Robert D. Morrison2

Heritabilities and expected genetic advances were estimated for head length, seed-branch length, node number per head, and 100-seed weight in five crosses of sorghum [Sorghum bicolor (L.) Moench]. Phenotypic, genotypic, and environmental correlation coefficients also were calculated.

Head length and seed-branch length exhibited relatively large estimates of heritability and expected genetic advance in each cross. In general, high positive genotypic correlations were observed between these characters. Therefore, rapid progress should result from early generation slection for either character, which should also result in simultaneous improvement in the other character as well.

Node number per head and 100-seed weight exhibited relatively low heritabilities and expected genetic advances. Substantial progress under early generation selection for these characters could not be expected. However, selection for longer heads should increase node number per head in four of the five crosses and 100-seed weight in one cross, since high positive genotypic correlations were observed in those instances.

Key Words: Head length • Seed-branch length • Node number per head • Seed weight • Seed size • Heritability • Expected genetic advance • Correlation

1 Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree in Crop Science at Oklahoma State University. Journal Article No. 1928 of the Agricultural Experiment Station, Oklahoma State University, Stillwater, Okla.

2 Assistant Professor of Statistics, Department of Agricultural Physics, Macdonald College of McGill Uuniversity, Quebec, Canada (formerly Consulting Statistician in the Department of Mathematics and Statistics, Oklahoma State University), Professor in the Department of Agronomy, and Professor in the Department of Mathematics and Statistics, respectively, Oklahoma State University, Stillwater, Okla. 74074.

Received for publication July 15, 1971.




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