Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 12:674-676 (1972)
© 1972 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Gibberellic Acid on Alfalfa (Medicago sativa L.)1

D. F. Cole, A. K. Dobrenz and M. A. Massengale2

The objectives of this investigation were to evaluate the effects of gibberellic acid (GA) on yield, photosynthesis, respiration, specific leaf weight (SLW) and carbohydrate root reserves in alfalfa (Medicago sativa L.) grown under irrigated field conditions at Tucson, Ariz. Data showed that GA significantly increased forage yield on treated plants; regrowth on these plants, however, was reduced. Increases in forage production from GA-treated plants were due to increased stem production. Photosynthesis, respiration, and SLW were significantly decreased by GA application, and roots from plants sprayed with GA had lower percentages of free and acid-hydrolyzable (A-HC) carbohydrates. The results indicate GA affected the ‘source-sink’ relationship in trans-location and carbohydrate storage in alfalfa.

Key Words: Photosynthesis • Respiration • Specific leaf weight • Root reserves

1 Contribution from Department of Agronomy and Plant Genetics, University of Arizona, Tucson, Ariz. This research was financed in part by Grant 716-15-2 from the Cooperative State Research Service of the USDA. Part of a dissertation submitted by the senior author in partial fulfillment of the requirements for the Ph.D, degree. Arizona Agricultural Experiment Station Journal Paper No. 1876.

2 Formerly Research Assistant (now Research Plant Physiologist, Field Crops and Animal Products Research Branch, MQRD, ARS, USDA, Beltsville, Md. 20705), Professor, and Professor and Head, Department of Agronomy and Plant Genetics, University of Arizona, Tucson 85721.

Received for publication February 22, 1972.


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