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1-Aminocyclopropane-1-carboxylic acid and abscisic acid during the germination of sugar beet (Beta vulgaris L.): a comparative study of fruits and seeds

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    SYSNO ASEP0305971
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JOstatní články
    Title1-Aminocyclopropane-1-carboxylic acid and abscisic acid during the germination of sugar beet (Beta vulgaris L.): a comparative study of fruits and seeds
    Title1-Aminocyclopropane-1-carboxylic acid and abscisic acid during the germination of sugar beet (Beta vulgaris L.): a comparative study of fruits and seeds
    Author(s) Hermann, K. (DE)
    Meinhard, J. (DE)
    Dobrev, Petre (UEB-Q) RID, ORCID
    Linkies, A. (DE)
    Pešek, Bedřich (UEB-Q) RID
    Heß, B. (DE)
    Macháčková, Ivana (UEB-Q)
    Fischer, U. (DE)
    Leubner-Metzger, G. (DE)
    Source TitleJournal of Experimental Botany. - : Oxford University Press - ISSN 0022-0957
    Roč. 58, č. 11 (2007), s. 3047-3060
    Number of pages14 s.
    Languageeng - English
    CountryGB - United Kingdom
    Keywordsabscisic acid (ABA) ; ABA 8'-hydroxylase (CYP707A) ; 1-aminocyclopropane-1-carboxylic acid (ACC)
    Subject RIVEF - Botanics
    CEZAV0Z50380511 - UEB-Q (2005-2011)
    DOI10.1093/jxb/erm162
    AnnotationThe control of sugar beet (Beta vulgaris L.) germination by plant hormones was studied by comparing fruits and seeds. Treatment of sugar beet fruits and seeds with gibberellins, brassinosteroids, auxins, cytokinins, and jasmonates or corresponding hormone biosynthesis inhibitors did not appreciably affect radicle emergence of fruits or seeds. By contrast, treatment with ethylene or the ethylene precursor 1-aminocyclopropane-1-carboxylic acid (ACC) promoted radicle emergence of fruits and seeds. Abscisic acid (ABA) acted as an antagonist of ethylene and inhibited radicle emergence of seeds, but not appreciably of fruits. High endogenous contents of ACC and of ABA were evident in seeds and pericarps of dry mature fruits, but declined early during imbibition. ABA-treatment of seeds and fruits induced seed ACC accumulation while ACC-treatment did not affect the seed ABA content. Transcripts of ACC oxidase (ACO, ethylene-forming enzyme) and ABA 8'-hydroxylase (CYP707A, ABA-degrading enzyme) accumulate in fruits and seeds upon imbibition. ABA and ACC and the pericarp did not affect the seed CYP707A transcript levels. By contrast, seed ACO transcript accumulation was promoted by ABA and by pericarp removal, but not by ACC. Quantification of the endogenous ABA and ACC contents, ABA and ACC leaching, and ethylene evolution, demonstrate that an embryo-mediated active ABA extrusion system is involved in keeping the endogenous seed ABA content low by 'active ABA leaching', while the pericarp restricts ACC leaching during imbibition. Sugar beet radicle emergence appears to be controlled by the pericarp, by ABA and ACC leaching, and by an ABA-ethylene antagonism that affects ACC biosynthesis and ACO gene expression.
    WorkplaceInstitute of Experimental Botany
    ContactDavid Klier, knihovna@ueb.cas.cz, Tel.: 220 390 469
    Year of Publishing2008
Number of the records: 1  

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