Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 27:522-525 (1987)
© 1987 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Inheritance of Seedling Hydrocyanic Acid Potential and Seed Weight in Sorghum-Sudangrass Crosses1

J. F. S. Lamb, F. A. Haskins, H. J. Gorz and K. P. Vogel2

The hydrocyanic acid potential (HCN-p) of sorghum [Sorghum bicolor (L.) Moench] plants is recognized as a heritable trait, but previous studies on the mode of inheritance of HCN-p have produced inconsistent results. The objective of this study was to investigate the inheritance patterns of seedling HCN-p and also of seed weight in reciprocal crosses of sorghum and sudangrass [formerly S. sudanense (Piper) Stapf]. Both traits were found to be inherited quantitatively. Generation means analysis indicated that additive genetic effects were most important for both seed weight (53% of variation) and seedling HCN-p (74% of variation). A maternal effect was found for both traits in the F1 and backcross generations. No evidence of this reciprocal effect was found in the F2, suggesting that cytoplasmic inheritance was not involved. A highly positive correlation between seed weight and HCN-p was found across all entries, across both parents, and in the F~ and backcross generations. However, correlation coefficients between seed weight and seedling HCN-p for individual entries, the pooled F2'S, or within types of seed parents in the F1 or backcross generations were generally nonsignificant. It was concluded that seed weight per se does not have a large effect on seedling HCN-p.

Key Words: Dhurrin • Prussic acid • Sorghum bicolor (L.) Moench. • S. sudanense (Piper) Stapf

1 Contribution from the USDA-ARS and the Nebraska Agric. Res. Div., Lincoln, NE 68583. Published as Paper no. 8119, Journal Series, Nebraska Agaric. Res. Div. Research was conducted under Project 12-114.

2 Former graduate research assistant, George Holmes professor of agronomy, and supervisory research geneticists, USDA-ARS, respectively.

Received for publication August 7, 1986.




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Copyright © 1987 by the Crop Science Society of America.