Abstract
A simple model system was designed to detect positive effects of Azospirillum on the root growth of cereals. Cultures of A. brasilense Sp7 and A. lipoferum Sp59 did not excrete gibberellins and cytokinins in the logarithmic and in the early stationary growth phase. Indoleacetic acid (I A A) was formed, however, only in the stationary phase of the cultures. The addition of D,L-tryptophan to the medium enhanced the formation of IA A. A further, still unidentified substance was produced by Azospirillum under denitrifying conditions in the logarithmic growth phase. The substance was almost twice as active as IAA in increasing the wet weight of wheat root segments. It is suggested that this unidentified substance is the major stimulus affecting the growth of cereals.
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Dedicated to Professor E.-G. Niemann, Hannover, on the occasion of his 60th birthday.
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© 1989 Kluwer Academic Publishers
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Zimmer, W., Bothe, H. (1989). The phytohormonal interactions between Azospirillum and wheat. In: Skinner, F.A., Boddey, R.M., Fendrik, I. (eds) Nitrogen Fixation with Non-Legumes. Developments in Plant and Soil Sciences, vol 35. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0889-5_17
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DOI: https://doi.org/10.1007/978-94-009-0889-5_17
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