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Published in Crop Sci 13:23-26 (1973)
© 1973 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Deposition, Retention, and Translocation of 2,3,5-Triiodobenzoic Acid Applied to Soybeans1

Kenneth Ohki and Landy J. McBride2

Factors related to TIBA (2,3,5-triiodobenzoic acid) deposition and retention on soybean [Glycine max (L.) Merrill] leaves and TIBA translocation were studied with 125I- and 131I- labeled TIBA. Factors studied were four TIBA salt forms and four surfactants at two concentrations of each surfactant.

Mean values for salt forms indicated no salt effect on TIBA deposition. Surfactant type had a pronounced effect on TIBA deposition. Maximum and minimum depositions were attained with Tween-20 and Triton X-100, respectively. Both surfactants were nonionic, indicating nonspecificity in relation to ionogenic types of surfactant. The higher surfactant rate varied from no influence to a depressive effect on TIBA deposition, indicating nonspecificity in TIBA-surfactant concentration relationships.

TIBA retention was enhanced at the higher surfactant rate by the two nonionic surfactants, while no effect was attained by the higher rate of the cationic and anionic surfactants. TIBA was rapidly translocated from recently matured leaves to young developing leaves and tissues of high metabolic activity.

Key Words: Growth regulator • Surfactant-TIBA interaction

1 Contributions from the Growth Sciences Center, International Minerals and Chemical Corp., Libertyville, Ill. 60048.

2 Assistant Professor of Agronomy, University of Georgia, College of Agriculture Experiment Stations, Georgia Station, Experiment, Ga. 30212, and Senior Research Scientist, Research and Development, American Can Co., Neenah, Wis. 54956 (formerly, Specialist, Plant Physiology and Research Plant Physiologist, respectively, Growth Sciences Center, International Minerals and Chemical Corp., Libertyville, Ill. 60048).

Received for publication May 25, 1972.




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Copyright © 1973 by the Crop Science Society of America.