Abstract

Hitchcock (1935) found that application of indole propionic acid in lanolin paste (50 mg/gm.) to cut surface of decapitated tobacco stem inhibited the growth of terminal bud but stimulated the growth of buds in the middle and lower parts of the stem. Hitchcock and Zimmerman (1935) reported that the addition of 1 to 8 mg., per pot, of aqueous solutions of indole acetic acid, indole propionic acid, naphthalene acetic acid, phenyl acetic acid and phenyl propionic acid caused permanent swelling and bending of the stem. They (1942) found that when tobacco plants were sprayed with 300 p. p. m. of napthoxy acetic acid, there was rapid growth of the plants, as compared to the check plants. When plants were treated with 200 p. p. m. of chlorophenoxy acetic acid, some formative effects were observed by them. According to McEvoy (1942) appli- cation of 25 p. p. m. of indole acetic acid at the rate of 250 ml. per sq. ft. was beneficial in stimulating the growth of tobacco plants. Liguori and Martino (1953) reported that the proprietory root promoting substances Rootone, Aumentone and Transplantone, when used for treating the beds of Turkish tobacco, there was slight reduction in the germination percentage, but the plants arising from Rootone-treated seeds showed better development than the control.

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