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Light and Electron Microscope Studies on Synergistic Interaction between Gibberellic Acid and 4-Ethoxy-1-(p-tolyl)-s-triazine-2,6 (1H, 3H)-dione in Growth of Rice Leaf Sheaths

MASAMI OGAWA, HIROSHI MIYAKE and EIZO MAEDA
Journal of Experimental Botany
Vol. 31, No. 121 (April 1980), pp. 533-544
Published by: Oxford University Press
Stable URL: http://www.jstor.org/stable/23689791
Page Count: 12
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Light and Electron Microscope Studies on Synergistic Interaction between Gibberellic Acid and 4-Ethoxy-1-(p-tolyl)-s-triazine-2,6 (1H, 3H)-dione in Growth of Rice Leaf Sheaths
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Abstract

4-Ethoxy-1-(p-tolyl)-s-triazine-2,6(1H,3H)-dione (TA) dramatically and synergistically promoted gibberellic acid-induced elongation of rice second leaf sheaths. The elongation from 84 to 132 h after sowing occurred only at the region 0—2 mm from the base in control samples, at the 0—4 mm region in TA- or GA-treated samples, and at the 0—12 mm region in TA plus GA-treated samples. The increase in elongation rate induced by TA and/or GA was greatest in the 0—2 mm region and decreased gradually toward the ligule. The longitudinal growth induced by TA and/or GA was due to the increase in cell numbers by cell division, as well as to increase in length of cells. Electron microscopic examinations revealed that TA and/or GA suppressed the development of plastids which caused the leaf colour to be pale. Irrespective of TA and/or GA treatment(s), microtubules were observed to be exclusively oriented perpendicular to the longitudinal axis of the cell in actively elongating zones, and in fully elongated zones they were randomly oriented.

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