Document Detail

Seeds of Brassicaceae weeds have an inherent or inducible response to the germination stimulant karrikinolide.
MedLine Citation:
PMID:  21821831     Owner:  NLM     Status:  MEDLINE    
BACKGROUND AND AIMS: Karrikinolide (KAR(1)) is a smoke-derived chemical that can trigger seeds to germinate. A potential application for KAR(1) is for synchronizing the germination of weed seeds, thereby enhancing the efficiency of weed control efforts. Yet not all species germinate readily with KAR(1), and it is not known whether seemingly non-responsive species can be induced to respond. Here a major agronomic weed family, the Brassicaceae, is used to test the hypothesis that a stimulatory response to KAR(1) may be present in physiologically dormant seeds but may not be expressed under all circumstances.
METHODS: Seeds of eight Brassicaceae weed species (Brassica tournefortii, Raphanus raphanistrum, Sisymbrium orientale, S. erysimoides, Rapistrum rugosum, Lepidium africanum, Heliophila pusilla and Carrichtera annua) were tested for their response to 1 µm KAR(1) when freshly collected and following simulated and natural dormancy alleviation, which included wet-dry cycling, dry after-ripening, cold and warm stratification and a 2 year seed burial trial.
KEY RESULTS: Seven of the eight Brassicaceae species tested were stimulated to germinate with KAR(1) when the seeds were fresh, and the remaining species became responsive to KAR(1) following wet-dry cycling and dry after-ripening. Light influenced the germination response of seeds to KAR(1), with the majority of species germinating better in darkness. Germination with and without KAR(1) fluctuated seasonally throughout the seed burial trial.
CONCLUSIONS: KAR(1) responses are more complex than simply stating whether a species is responsive or non-responsive; light and temperature conditions, dormancy state and seed lot all influence the sensitivity of seeds to KAR(1), and a response to KAR(1) can be induced. Three response types for generalizing KAR(1) responses are proposed, namely inherent, inducible and undetected. Given that responses to KAR(1) were either inherent or inducible in all 15 seed lots included in this study, the Brassicaceae may be an ideal target for future application of KAR(1) in weed management.
Rowena L Long; Jason C Stevens; Erin M Griffiths; Markus Adamek; Marta J Gorecki; Stephen B Powles; David J Merritt
Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2011-08-05
Journal Detail:
Title:  Annals of botany     Volume:  108     ISSN:  1095-8290     ISO Abbreviation:  Ann. Bot.     Publication Date:  2011 Oct 
Date Detail:
Created Date:  2011-09-22     Completed Date:  2012-03-05     Revised Date:  2013-06-28    
Medline Journal Info:
Nlm Unique ID:  0372347     Medline TA:  Ann Bot     Country:  England    
Other Details:
Languages:  eng     Pagination:  933-44     Citation Subset:  IM    
School of Plant Biology, The University of Western Australia, 35 Stirling Highway, Crawley 6009, Western Australia, Australia.
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MeSH Terms
Brassica / drug effects,  physiology
Brassicaceae / drug effects*,  physiology
Furans / pharmacology*
Germination / drug effects*
Lepidium / drug effects,  physiology
Plant Growth Regulators / pharmacology*
Plant Weeds / growth & development*
Pyrans / pharmacology*
Raphanus / drug effects,  physiology
Seed Dormancy / drug effects
Seeds / drug effects*
Western Australia
Reg. No./Substance:
0/Furans; 0/Plant Growth Regulators; 0/Pyrans; 0/karrikinolide

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