Spatial and temporal changes in multiple hormone groups during lateral bud release shortly following apex decapitation of chickpea (Cicer arietinum) seedlings

Mader, Johanna C., Emery, R. J. Neil and Turnbull, Colin G. N. (2003) Spatial and temporal changes in multiple hormone groups during lateral bud release shortly following apex decapitation of chickpea (Cicer arietinum) seedlings. Physiologia Plantarum, 119 2: 295-308. doi:10.1034/j.1399-3054.2003.00179.x


Author Mader, Johanna C.
Emery, R. J. Neil
Turnbull, Colin G. N.
Title Spatial and temporal changes in multiple hormone groups during lateral bud release shortly following apex decapitation of chickpea (Cicer arietinum) seedlings
Journal name Physiologia Plantarum   Check publisher's open access policy
ISSN 0031-9317
Publication date 2003
Sub-type Article (original research)
DOI 10.1034/j.1399-3054.2003.00179.x
Volume 119
Issue 2
Start page 295
End page 308
Total pages 14
Place of publication Copenhagen, Denmark
Publisher Blackwell Munksgaard
Collection year 2003
Language eng
Subject C1
270402 Plant Physiology
620108 Grain legumes
Abstract Although the co-ordination of promotive root-sourced cytokinin (CK) and inhibitory shoot apex-sourced auxin (IAA) is central to all current models on lateral bud dormancy release, control by those hormones alone has appeared inadequate in many studies. Thus it was hypothesized that the IAA : CK model is the central control but that it must be considered within the relevant timeframe leading to lateral bud release and against a backdrop of interactions with other hormone groups. Therefore, IAA and a wide survey of cytokinins (CKs), were examined along with abscisic acid (ABA) and polyamines (PAs) in released buds, tissue surrounding buds and xylem sap at 1 and 4 h after apex removal, when lateral buds of chickpea are known to break dormancy. Three potential lateral bud growth inhibitors, IAA, ABA and cis-zeatin 9-riboside (ZR), declined sharply in the released buds and xylem following decapitation. This is in contrast to potential dormancy breaking CKs like trans-ZR and trans-zeantin 9-riboside 5'phosphate (ZRMP), which represented the strongest correlative changes by increasing 3.5-fold in xylem sap and 22-fold in buds. PAs had not changed significantly in buds or other tissues after 4 h, so they were not directly involved in the breaking of bud dormancy. Results from the xylem and surrounding tissues indicated that bud CK increases resulted from a combination synthesis in the bud and selective loading of CK nucleotides into the xylem from the root.
Keyword Plant Sciences
Phaseolus-vulgaris L
Long-distance Transport
Cis-zeatin Riboside
Performance Liquid-chromatography
Abscisic-acid Concentration
Cytokinin Oxidase
Apical Dominance
Tobacco Plants
Lupinus-angustifolius
Biosynthetic-enzymes
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2004 Higher Education Research Data Collection
School of Biological Sciences Publications
 
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Created: Tue, 14 Aug 2007, 19:09:52 EST