Agronomy Journal Journal of Natural Resources and Life Sciences Education
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Published online 1 December 1958
Published in Agron J 50:735-738 (1958)
© 1958 American Society of Agronomy
677 S. Segoe Rd., Madison, WI 53711 USA
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Development of Spring Wheat: I. The Effect of Photoperiod1

J. A. Riddell, George A. Gries and Forest W. Stearns2

Synopsis: Increasing the day length accelerated development, primarily during the pre-initiation phase of growth. Dividing the normal 24-hour day into several cycles in which the same light-to-darkness ratio was maintained also accelerated development. This promotion in development was due to the interruption of the dark rather than the light period.

1 Contribution from the Department of Botany and Plant Pathology, Purdue University, Lafayette, Ind. Journal Paper No. 1236, Purdue University Agr. Exp. Sta. A portion of a thesis by the senior author in partial fulfillment of the requirements for the Ph.D. degree at Purdue University. The work was supported by a grant from the Purdue Research Foundation.

2 Former Graduate Assistant. Purdue University, now at Naugatuck Chemical Co., Division United States Rubber Co., Bethany, Conn.; Professor of Plant Physiology, Purdue University; and former Assistant Professor, Purdue University, now at Vicksburg Research Center, Forest Service, USDA, Waterways Experiment Station, Vicksburg, Miss., respectively.

Received for publication March 24, 1958.




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Copyright © 1958 by the American Society of Agronomy.