Document Detail

Increased ABA sensitivity results in higher seed dormancy in soft white spring wheat cultivar 'Zak'.
MedLine Citation:
PMID:  23212773     Owner:  NLM     Status:  MEDLINE    
As a strategy to increase the seed dormancy of soft white wheat, mutants with increased sensitivity to the plant hormone abscisic acid (ABA) were identified in mutagenized grain of soft white spring wheat "Zak". Lack of seed dormancy is correlated with increased susceptibility to preharvest sprouting in wheat, especially those cultivars with white kernels. ABA induces seed dormancy during embryo maturation and inhibits the germination of mature grain. Three mutant lines called Zak ERA8, Zak ERA19A, and Zak ERA19B (Zak ENHANCED RESPONSE to ABA) were recovered based on failure to germinate on 5 μM ABA. All three mutants resulted in increased ABA sensitivity over a wide range of concentrations such that a phenotype can be detected at very low ABA concentrations. Wheat loses sensitivity to ABA inhibition of germination with extended periods of dry after-ripening. All three mutants recovered required more time to after-ripen sufficiently to germinate in the absence of ABA and to lose sensitivity to 5 μM ABA. However, an increase in ABA sensitivity could be detected after as long as 3 years of after-ripening using high ABA concentrations. The Zak ERA8 line showed the strongest phenotype and segregated as a single semi-dominant mutation. This mutation resulted in no obvious decrease in yield and is a good candidate gene for breeding preharvest sprouting tolerance.
Elizabeth C Schramm; Sven K Nelson; Kimberlee K Kidwell; Camille M Steber
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2012-12-05
Journal Detail:
Title:  TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik     Volume:  126     ISSN:  1432-2242     ISO Abbreviation:  Theor. Appl. Genet.     Publication Date:  2013 Mar 
Date Detail:
Created Date:  2013-02-25     Completed Date:  2013-09-16     Revised Date:  2014-11-02    
Medline Journal Info:
Nlm Unique ID:  0145600     Medline TA:  Theor Appl Genet     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  791-803     Citation Subset:  IM    
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MeSH Terms
Abscisic Acid / pharmacology*
Dose-Response Relationship, Drug
Plant Dormancy / drug effects*
Plant Growth Regulators / pharmacology*
Seeds / drug effects,  genetics
Triticum / genetics*
Grant Support
Reg. No./Substance:
0/Plant Growth Regulators; 72S9A8J5GW/Abscisic Acid

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

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