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Promotion of Growth and Hydrogen Ion Efflux by Auxin in Roots of Maize Pretreated with Ethylene Biosynthesis Inhibitors ¹

Department of Botany, Ohio State University, Columbus, Ohio 43210, Department of Molecular, Cellular and Developmental Biology Program, Ohio State University, Columbus, Ohio 43210

Low concentrations of auxin (e.g. 10^–10M) do not promote the growth of intact seedling roots of maize (Zea mays L. Bear Hybrid WF 9 x 38). Higher concentrations are inhibitory. When the roots are pretreated with the ethylene biosynthesis inhibitors, cobalt and aminoethoxyvinylglycine, auxin (10^–10 to 10^–8M) strongly promotes their growth. The promotion of growth by auxin in pretreated roots is preceded by enhanced hydrogen ion secretion from the roots. The data indicate that hormone-enhanced hydrogen ion secretion may play a role in the rapid promotion of root growth by auxin. The ability of auxin to promote the growth of intact roots is discussed in relation to the Cholodny/Went hypothesis of hormonal control of root geotropism.

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