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Effect of Cyclanilide, Ethephon, Auxin Transport Inhibitors, and Temperature on Whole Plant Defoliation

^a North Carolina State University, Dep. of Horticulture Science, Box 7609, Raleigh, NC 27695
^b USDA/ARS/OPMP, Washington, DC 20250

View larger version (25K): [in a new window]   Fig. 1. Structures of chemicals used in the research studying leaf abscission (cyclanilide, NPA, TIBA, and ethephon). Structures of IAA, ethylene, and ACC are included because they are endogenous compounds involved in abscission.

View larger version (20K): [in a new window]   Fig. 2. Defoliation of dark red kidney beans across time with ethephon (E) alone at 0.140 kg a.i./ha and 0.067 kg a.i./ha, and cyclanilide (C) at 0.140 kg a.i./ha combined with ethephon at 0.067 kg a.i./ha. Each point represents mean ± SE, n = 3.

View larger version (15K): [in a new window]   Fig. 3. Defoliation (5 DAT) of dark red kidney beans sprayed with increasing rates of ethephon (E) alone, and increasing rates of cyclanilide (C) combined with 0.067 kg a.i./ha ethephon. Each point represents mean ± SE, n = 3.

View larger version (22K): [in a new window]   Fig. 4. Effect of decreasing day and night temperatures on red kidney bean defoliation (5 DAT) after treatment with ethephon alone at 0.067 kg a.i./ha, or in combination with 0.067 kg a.i./ha cyclanilide. Each point represents mean ± SE, n = 6.

View larger version (20K): [in a new window]   Fig. 5. Effect of cyclanilide and auxin transport inhibitors on ethephon-induced defoliation of red kidney bean, 5 DAT. Defoliation of plants sprayed with increasing rates of ethephon (E) alone, or in combination with 0.140 kg a.i./ha NPA (N), TIBA (T), and cyclanilide (C). Each point represents mean ± SE, n = 3.