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Published in Crop Sci 9:399-402 (1969)
© 1969 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effects of 2,3,5-Triiodobenzoic Acid on the Morphology and Anatomy of Glycine max (L.) Merrill1

S. R. Ghorashy, W. L. Colville and D. L. Ashworth2

A foliar application of 75 g/ha of 2,3,5-triiodobenzoic acid (TIBA) on soybeans at the six-trifoliolate-leaf stage modified the morphology and anatomy of the stem, leaf, and petiole. Plants treated with TIBA had a greater number of branches and were shorter than untreated plants. Leaves differentiated after TIBA treatment were smaller, darker green and showed interveinal puckering. Leaves located at nodes 17 and/or 18 exhibited considerable proliferation of vascular bundles. Histological examination of these leaves indicated continuous procambium activity, disorganization of mesophyll tissues and reduced cell size in the laminae. Tetrafoliolate leaves were frequently developed at nodes 17 and 18 on plants receiving TIBA treatments. Petioles developed after TIBA treatment were longer, twisted and in some cases showed tissue abnormalities. Application of TIBA did not increase stem diameter, but altered the pattern of cambium activity throughout the length of the stem.

Key Words: Soybean • Cambium activity • Antiauxin

1 Contribution of the Department of Agronomy. Published with the approval of the Director as paper No. 2420 Journal Series, Nebraska Agricultural Experiment Station, Lincoln, Nebr. 68503. The authors gratefully acknowledge partial support of this project from the International Minerals and Chemical Corp., Skokie, Ill.

2 Formerly Research Assistant (now Research Assistant in Agronomy, University of Illinois), Professor, and former Research Assistant, Department of Agronomy, University of Nebraska, Lincoln, Nebraska.

Received for publication August 30, 1968.




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