Effect of benzyladenine (BA) on auxin-induced stem elongation and thickening in tulip (Tulipa gesneriana L.)

Marian Saniewski, Elżbieta Węgrzynowicz-Lesiak, Justyna Góraj-Koniarska, Eleonora Gabryszewska

Abstract


It is well known that stem elongation in tulip is induced by the auxin produced in the leaves and gynoecium. Excision of the flower bud and all the leaves in an early stage of tulip growth resulted in almost total inhibition of stem growth, but the inhibition was completely recovered by the exogenous application of auxin to the place from which the flower bud had been removed. Hormonal control of stem thickening in tulip is much less known. Additional application of benzyladenine (BA) to the tulip stem by soaking a cotton wick wrapped around all the internodes only slightly inhibited stem growth induced by IAA at a concentration of 0.1 and 2.0%, but substantially stimulated the thickening of all the internodes. The treatment of the tulip stem with benzyladenine enabled direct contact of the cytokinin with the epidermis, which is an important factor in stem elongation. The experiment conducted in field conditions also showed that BA only slightly inhibited the elongation of the fourth internode induced by IAA, but stimulated the thickening of that internode. IAA applied at a concentration of 2.0% stimulated ethylene production to a much higher extent than IAA at a concentration of 0.1%, and BA affected the auxin-induced ethylene production only to a small extent. Metabolic significance of these findings is discussed.

Keywords


cultivars ‘Gudoshnik’ and ‘Apeldoorn’; stem; growth; thickening; IAA; BA

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References


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DOI: https://doi.org/10.5586/aa.1650

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