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Title: Apical dominance in Pssu-ipt-transformed tobacco
Authors: Geuns, JMC
Smets, R
Struyf, T
Prinsen, E
VALCKE, Roland 
Van Onckelen, H
Issue Date: 2001
Source: PHYTOCHEMISTRY, 58(6). p. 911-921
Abstract: In Pssu-ipt-transformed tobacco, apical dominance was released by defoliation of the upper nodes, while the apex remained intact. After defoliation, the concentration of cytokinins (CKs) increased whereas IAA remained constant, evoking an increase in the CK/IAA ratio in the buds. Moreover, defoliation resulted in a tremendous increase in the concentrations of aromatic amines (AAs): tyramine (TYR), phenethylamine (PEA) and an as yet unidentified compound. Although the total aliphatic monoamine and polyamine (PA) concentration remained constant, putrescine (PUT) and spermidine (SPD) concentrations in the axillary buds decreased, whereas the concentration of spermine (SPM) increased. Similar changes in PAs and AAs could be observed in the buds of untransformed SR1 plants after decapitation, whereas defoliation without removal of the apex had no effect. This is the first report on the possible involvement of PAs and AAs in apical dominance. (C) 2001 Elsevier Science Ltd. All rights reserved.
Notes: Lab Plant Physiol, B-3001 Louvain, Belgium. UA, Dept Biol, B-2610 Wilrijk, Belgium. Univ Limburg, Ctr Dept SBG, Lab Plant Physiol, B-3590 Diepenbeek, Belgium.Geuns, JMC, Lab Plant Physiol, Kasteelpk Arenberg 31, B-3001 Louvain, Belgium.
Keywords: Nicotiana tabacum L.; Solanaceae; tobacco; apical dominance by defoliation; Ipt; polyamines; aromatic; amines; cytokinins; IAA
Document URI:
Link to publication: htp://
ISSN: 0031-9422
e-ISSN: 1873-3700
ISI #: 000172499300011
Category: A1
Type: Journal Contribution
Validations: ecoom 2002
Appears in Collections:Research publications

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