Vol. 71 No: 4

Title:
Promotion of Adventitious Root Formation in Mung Bean Cuttings by Four Triazole Growth Retardants

Authors:
I.C. PORLINGIS and MAGDALENE KOUKOURIKOU-PETRIDOU

pp: 573-580

Abstract:
The potency of paclobutrazol, BAS 111, triadimefon and triapenthenol in promoting adventitious root formation and their interactions with gibberellic acid (GA₃) were studied by using the mung bean (Vigna radiata (L.) R. Wilcz) rooting bioassay. Isoactive concentrations of the four compounds required for the formation of an average of 50 roots per cutting were 0.09, 0.8, 1.5 and 9 mg l^-1, respectively. GA₃ applied in combination with each retardant reversed its promoting effect. For the reduction of the number of roots (ca. 50) of cuttings treated with isoactive concentrations of the retardants to that of the untreated control (9–10 roots) the required concentration of GA₃ for triadimefon and triapenthenol was twice as high as for paclobutrazol and BAS 111. At high concentrations of GA₃ the difference between the number of roots in treatments, with and without paclobutrazol, was fully eliminated, but not when triapenthenol replaced paclobutrazol. Application of paclobutrazol, triadimefon or GA₃ to cuttings for 24 h intervals over the first five days of the assay, showed significant changes in their effectiveness, which followed a similar pattern for the three substances. Rooting was increased by the retardants without reduction of the cutting length. The results suggest that the retardants promote rooting by interfering with gibberellin biosynthesis but, in addition, some act by influencing another process or processes.

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