Document Detail

Ethylene and flower longevity in Alstroemeria: relationship between tepal senescence, abscission and ethylene biosynthesis.
MedLine Citation:
PMID:  15689338     Owner:  NLM     Status:  MEDLINE    
Senescence of floral organs is broadly divided into two groups: those that exhibit sensitivity to exogenous ethylene and those that do not. Endogenous ethylene production from the former group is via a well-characterized biochemical pathway and is either due to developmental or pollination-induced senescence. Many flowers from the order Liliales are characterized as ethylene-insensitive since they do not appear to produce endogenous ethylene, or respond to exogenous ethylene treatments, however, the majority of cases studied are wilting flowers, rather than those where life is terminated by perianth abscission. The role of ethylene in the senescence and abscission of Alstroemeria peruviana cv. Rebecca and cv. Samora tepals was previously unclear, with silver treatments recommended for delaying leaf rather than flower senescence. In the present paper the effects of exogenous ethylene, 2-chloroethylphosphonic acid (CEPA) and silver thiosulphate (STS) treatments on tepal senescence and abscission have been investigated. Results indicate that sensitivity to ethylene develops several days after flower opening such that STS only has a limited ability to delay tepal abscission. Detachment force measurements indicate that cell separation events are initiated after anthesis. Endogenous ethylene production was measured using laser photoacoustics and showed that Alstroemeria senesce independently of ethylene production, but that an extremely small amount of ethylene (0.15 nl flower(-1) h(-1)) is produced immediately prior to abscission. Investigation of the expression of genes involved in ethylene biosysnthesis by semi-quantitative RT-PCR indicated that transcriptional regulation is likely to be at the level of ACC oxidase, and that the timing of ACC oxidase gene expression is coincident with development of sensitivity to exogenous ethylene.
Carol Wagstaff; Usawadee Chanasut; Frans J M Harren; Luc-Jan Laarhoven; Brian Thomas; Hilary J Rogers; Anthony D Stead
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-02-02
Journal Detail:
Title:  Journal of experimental botany     Volume:  56     ISSN:  0022-0957     ISO Abbreviation:  J. Exp. Bot.     Publication Date:  2005 Mar 
Date Detail:
Created Date:  2005-03-09     Completed Date:  2005-06-07     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9882906     Medline TA:  J Exp Bot     Country:  England    
Other Details:
Languages:  eng     Pagination:  1007-16     Citation Subset:  IM    
School of Biological Sciences, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK.
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MeSH Terms
Alstroemeria / drug effects,  enzymology*,  growth & development
Amino Acid Oxidoreductases / metabolism
Ethylenes / biosynthesis*
Flowers / enzymology*
Gene Expression Profiling
Gene Expression Regulation, Developmental / physiology
Gene Expression Regulation, Enzymologic / physiology
Gene Expression Regulation, Plant / drug effects
Lyases / metabolism
Organophosphorus Compounds / pharmacology
Plant Growth Regulators / biosynthesis,  physiology
Thiosulfates / pharmacology
Time Factors
Reg. No./Substance:
0/Ethylenes; 0/Organophosphorus Compounds; 0/Plant Growth Regulators; 0/Thiosulfates; 16672-87-0/ethephon; 23149-52-2/silver thiosulfate; 74-85-1/ethylene; EC 1.4.-/Amino Acid Oxidoreductases; EC 1.4.3.-/1-aminocyclopropane-1-carboxylic acid oxidase; EC 4.-/Lyases; EC synthase

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