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Published in Crop Sci 7:497-501 (1967)
© 1967 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Dormancy in Sorghum bicolor (L.) Moench I. Relationship to Seed Development1

L. E. Clark, J. W. Collier and Ruble Langston2

Dormancy in relation to seed development in three varieties of sorghum (Sorghum blcolor (L.) Moench), ‘Martin’ (BTx398), ‘Combine Kafir-60’ (BTx3197), ‘Feterita’ (RTx09), was investigated in 1963 at College Station, Texas. From the results of this investigation, three mechanisms were proposed to function in dormancy. The first mechanism was associated with initial seed moisture and functioned until seed moisture was reduced to approximately 28% or less. This mechanism apparently functioned in seeds of all the varieties investigated, and it was the only one of the three mechanisms that functioned in seeds of Feterita. The second mechanism was associated with active growth of the seeds and functioned until maximum dry weight of the seeds was attained. This mechanism functioned in seeds of Combine Kafir-60 and Martin. The third mechanism functioned in seeds which had attained maximum dry weight and in which the moisture content was less than 28%. This mechanism was affected by the rate of seed development, and dormancy was more pronounced in seeds which developed more rapidly. The third mechanism functioned only in seeds of Martin. These mechanisms functioned only in intact seeds. Excised embryos from 15- through 30-day old seeds were not dormant.

Key Words: dormancy mechanisms • rate of seed development • active growth of seeds • dry weight of seeds • seed moisture

1 Contribution from the Texas Agricultural Experiment Station, Texas A&M University, College Station. Part of a dissertation submitted by the senior author in partial fulfillment of the requirements for the Ph.D. degree.

2 Assistant Professor and Associate Professor, Soil and Crop Sciences Department, and Professor, Sciences Department, Texas A&M University.

Received for publication February 27, 1967.




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