Altered Diurnal Leaf Movements in Soybean Seedlings Treated with Triazole Growth Regulators |
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Authors: | Davis, Tim D. Sankhla, Narendra |
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Affiliation: | 1Department of Agronomy and Horticulture, Brigham Young University Provo, Utah 84602, U.S.A. 2Department of Botany, University of Jodhpur Jodhpur 342001, India |
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Abstract: | Treatment of two-week old soybean (Glycine max (L.) Merr. cv.A2) seedlings with 250 µg of either soil-applied paclobutrazolor XE-1019 (also known as S-3307) altered diurnal leaf movementswithin 48 h. Leaf blade and petiole angles of primary leaves,relative to the horizontal, were consistently lower in the triazole-treatedseedlings compared to controls during the daylight hours. Atnight, leaves were completely folded down in both treated andcontrol seedlings, but leaves on treated seedlings reached thefolded down position approximately two hours earlier than controls.A single foliar spray of 6.0 mg-liter1 GA3 counteractedthe triazole effects on leaf blade and petiole angles. (Received February 25, 1987; Accepted July 21, 1987) |
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