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Delay of Iris flower senescence by cytokinins and jasmonates.
MedLine Citation:
PMID:  22974423     Owner:  NLM     Status:  Publisher    
It is not known whether tepal senescence in Iris flowers is regulated by hormones. We applied hormones and hormone inhibitors to cut flowers and isolated tepals of Iris × hollandica cv. Blue Magic. Treatments with ethylene or ethylene antagonists indicated lack of ethylene involvement. Auxins or auxin inhibitors also did not change the time to senescence. Abscisic acid (ABA) hastened senescence, but an inhibitor of ABA synthesis (norflurazon) had no effect. Gibberellic acid (GA(3) ) slightly delayed senescence in some experiments but in other experiments it was without effect, and gibberellin inhibitors (ancymidol or AMO-1618) were ineffective as well. Salicylic acid also had no effect. Ethylene, auxins, GA(3) , and SA affected flower opening, therefore did reach the flower cells. Jasmonates delayed senescence by about 2.0 d. Similarly, cytokinins delayed senescence by about 1.5-2.0 d. Antagonists of the phosphatidylinositol signal transduction pathway (lithium), calcium channels (niguldipine; verapamil), calmodulin action (fluphenazine; trifluoroperazine; phenoxybenzamide; W-7) or protein kinase activity (H-7; H-8; H-9) had no effect on senescence, indicating no role of a few common signal transduction pathways relating to hormone effects on senescence. The results indicate that tepal senescence in Iris cv. Blue Magic is not regulated by endogenous ethylene, auxin, gibberellins or salicylic acid. A role of abscisic acid can at present not be excluded. The data suggest the hypothesis that cytokinins and jasmonates are among the natural regulators.
Wouter G van Doorn; Fisun G Celikel; Caroline Pak; Harmannus Harkema
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-9-13
Journal Detail:
Title:  Physiologia plantarum     Volume:  -     ISSN:  1399-3054     ISO Abbreviation:  Physiol Plant     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-9-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  1256322     Medline TA:  Physiol Plant     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © Physiologia Plantarum 2012.
Agrotechnology and Food Sciences Group (AFSG), Wageningen University and Research Centre, P.O. Box 17, 6700 AA, Wageningen, The Netherlands.
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