Document Detail

Sites and regulation of polyamine catabolism in the tobacco plant. Correlations with cell division/expansion, cell cycle progression, and vascular development.
MedLine Citation:
PMID:  16040649     Owner:  NLM     Status:  MEDLINE    
We previously gave a picture of the homeostatic characteristics of polyamine (PA) biosynthesis and conjugation in tobacco (Nicotiana tabacum) plant organs during development. In this work, we present the sites and regulation of PA catabolism related to cell division/expansion, cell cycle progression, and vascular development in the tobacco plant. Diamine oxidase (DAO), PA oxidase (PAO), peroxidases (POXs), and putrescine N-methyltransferase expressions follow temporally and spatially discrete patterns in shoot apical cells, leaves (apical, peripheral, and central regions), acropetal and basipetal petiole regions, internodes, and young and old roots in developing plants. DAO and PAO produce hydrogen peroxide, a plant signal molecule and substrate for POXs. Gene expression and immunohistochemistry analyses reveal that amine oxidases in developing tobacco tissues precede and overlap with nascent nuclear DNA and also with POXs and lignification. In mature and old tissues, flow cytometry indicates that amine oxidase and POX activities, as well as pao gene and PAO protein levels, coincide with G2 nuclear phase and endoreduplication. In young versus the older roots, amine oxidases and POX expression decrease with parallel inhibition of G2 advance and endoreduplication, whereas putrescine N-methyltransferase dramatically increases. In both hypergeous and hypogeous tissues, DAO and PAO expression occurs in cells destined to undergo lignification, suggesting a different in situ localization. DNA synthesis early in development and the advance in cell cycle/endocycle are temporally and spatially related to PA catabolism and vascular development.
Konstantinos A Paschalidis; Kalliopi A Roubelakis-Angelakis
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-07-22
Journal Detail:
Title:  Plant physiology     Volume:  138     ISSN:  0032-0889     ISO Abbreviation:  Plant Physiol.     Publication Date:  2005 Aug 
Date Detail:
Created Date:  2005-09-20     Completed Date:  2005-12-23     Revised Date:  2013-06-09    
Medline Journal Info:
Nlm Unique ID:  0401224     Medline TA:  Plant Physiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2174-84     Citation Subset:  IM    
Department of Biology, University of Crete, 71409 Heraklion Crete, Greece.
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MeSH Terms
Cell Cycle / physiology*
DNA, Plant / biosynthesis
Gene Expression Regulation, Developmental / physiology
Gene Expression Regulation, Plant / physiology*
Oxidoreductases Acting on CH-NH Group Donors / biosynthesis*
Plant Leaves / metabolism
Plant Proteins / metabolism
Polyamines / metabolism*
Tobacco / metabolism*
Reg. No./Substance:
0/DNA, Plant; 0/Plant Proteins; 0/Polyamines; EC 1.5.-/Oxidoreductases Acting on CH-NH Group Donors

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