Document Detail

Abscisic acid in the thermoinhibition of lettuce seed germination and enhancement of its catabolism by gibberellin.
MedLine Citation:
PMID:  14676289     Owner:  NLM     Status:  MEDLINE    
Germination of lettuce (Lactuca sativa L. cv. 'Grand Rapids') seeds was inhibited at high temperatures (thermoinhibition). Thermoinhibition at 28 degrees C was prevented by the application of fluridone, an inhibitor of abscisic acid (ABA) biosynthesis. At 33 degrees C, the sensitivity of the seeds to ABA increased, and fluridone on its own was no longer effective. However, a combined application of fluridone and gibberellic acid (GA3) was able to restore the germination. Exogenous GA3 lowered endogenous ABA content in the seeds, enhancing catabolism of ABA and export of the catabolites from the intact seeds. The fluridone application also decreased the ABA content. Consequently, the combined application of fluridone and GA3 decreased the ABA content to a sufficiently low level to allow germination at 33 degrees C. There was no significant temperature-dependent change in endogenous GA1 contents. It is concluded that ABA is an important factor in the regulation of thermoinhibition of lettuce seed germination, and that GA affects the temperature responsiveness of the seeds through ABA metabolism.
Takeru Gonai; Shusuke Kawahara; Makoto Tougou; Shigeru Satoh; Teruyoshi Hashiba; Nobuhiro Hirai; Hiroshi Kawaide; Yuji Kamiya; Toshihito Yoshioka
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of experimental botany     Volume:  55     ISSN:  0022-0957     ISO Abbreviation:  J. Exp. Bot.     Publication Date:  2004 Jan 
Date Detail:
Created Date:  2003-12-16     Completed Date:  2004-04-06     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9882906     Medline TA:  J Exp Bot     Country:  England    
Other Details:
Languages:  eng     Pagination:  111-8     Citation Subset:  IM    
Graduate School of Agricultural Science, Tohoku University, Sendai, Miyagi 981-8555, Japan.
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MeSH Terms
Abscisic Acid / metabolism,  pharmacology*
Dose-Response Relationship, Drug
Drug Combinations
Germination / drug effects,  physiology
Gibberellins / metabolism,  pharmacology*
Lettuce / drug effects,  growth & development*
Plant Growth Regulators / pharmacology*
Pyridones / pharmacology
Seeds / drug effects,  growth & development*
Reg. No./Substance:
0/Drug Combinations; 0/Gibberellins; 0/Plant Growth Regulators; 0/Pyridones; 21293-29-8/Abscisic Acid; 59756-60-4/fluridone; 77-06-5/gibberellic acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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