Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 13:175-178 (1973)
© 1973 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Physiologic Maturity in Grain Sorghum1

Jerry D. Eastin, Joe H. Hultquist and C. Y. Sullivan2

External visualization of the apparent dark closing layer in the placental area near the sorghum [Sorghum bicolor (L.) Moench] kernel attachment point coincides closely with the cutoff of radioactive assimilate translocation to the kernel. Dark layer determination permits identification of physiologic maturity or date of maximum dry weight accumulation. This judgment is meaningful because yield is a function of both time and metabolic efficiency. Genotypes can be characterized in terms of grain filling-period duration by noting the dates of bloom and dark layer formation. Yield data plus physiologic maturity data permit direct field quantitation of the time and metabolic efficiency components of gram dry weight accumulation.

Key Words: Dark closing layer • Grain-filling period • Physiologic maurity • Translocation

1 Published with the approval of the Director as Paper No.3384 Journal Series, Nebraska Agr. Exp. Sta. Financial support for this work was by The Rockefeller Foundation, The DeKalb AgResearch Foundation, and the U.S. Department of Agriculture. Mention of trade names does not imply endorsement by these agencies or the University of Nebraska.

2 Professor, Agronomy Department, University of Nebraska; Agronomist, Agricultural Research Service, USDA; and Associate Professor, Horticulture and Forestry Department, University of Nebraska.

Received for publication May 25, 1972.


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The SCI Journals Agronomy Journal Vadose Zone Journal
Journal of Natural Resources
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Environmental Quality		 The Plant Genome
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