Biologia plantarum 55:664, 2011 | DOI: 10.1007/s10535-011-0165-9

Hormonal control of the outgrowth of axillary buds in Alstroemeria cultured in vitro

P. Pumisutapon1,2,3,*, R. G. F. Visser1, G. -J. De Klerk1
1 Wageningen UR Plant Breeding, Wageningen, The Netherlands
2 Graduate School Experimental Plant Science, Wageningen, The Netherlands
3 Department of Biology, Faculty of Sciences, Maejo University, Sansai, Chiang Mai, Thailand

We study apical dominance in Alstroemeria, a plant with an architecture very different from the model species used in research on apical dominance. The standard explant was a rhizome with a tip and two vertically growing shoots from which the larger part had been excised leaving ca. 1 cm stem. The axillary buds that resumed growth were located at this 1-cm stem just above the rhizome. They were released by removal of the rhizome tip and the shoot tips. Replacement of excised tips by lanolin with indole-3-butyric acid (IBA) restored apical dominance. The auxin transport inhibitors 2,3,5-triiodobenzoic acid (TIBA) and N-1-napthylphthalamic acid (NPA) reduced apical dominance. 6-Benzylaminopurine (BAP) enhanced axillary bud outgrowth but the highest concentrations (> 9 μM) caused fasciation. Thidiazuron (TDZ) did not show improvement relative to BAP. Even though the architecture of Alstroemeria and the model species are very different, their hormonal mechanisms in apical dominance are for the greater part very similar.

Keywords: apical dominance; auxin; auxin transport inhibitors; cytokinin; rhizome; sympodial growth

Received: February 17, 2010; Accepted: September 21, 2010; Published: December 1, 2011Show citation

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Pumisutapon, P., Visser, R.G.F., & Klerk, G.-J. (2011). Hormonal control of the outgrowth of axillary buds in Alstroemeria cultured in vitro. Biologia plantarum, 55(4), 664. doi: 10.1007/s10535-011-0165-9.
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