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Abscisic acid, gibberellins and brassinosteroids in Kelpak (R), a commercial seaweed extract made from Ecklonia maxima
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SYSNO ASEP 0429988 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Abscisic acid, gibberellins and brassinosteroids in Kelpak (R), a commercial seaweed extract made from Ecklonia maxima Author(s) Stirk, W. A. (ZA)
Tarkowská, Danuše (UEB-Q) RID, ORCID
Turečková, Veronika (UEB-Q) RID, ORCID
Strnad, Miroslav (UEB-Q) RID, ORCID
van Staden, J. (ZA)Source Title Journal of Applied Phycology. - : Springer - ISSN 0921-8971
Roč. 26, č. 1 (2014), s. 561-567Number of pages 7 s. Language eng - English Country US - United States Keywords Abscisic acid ; Agricultural biostimulant ; Brassinosteroids Subject RIV EF - Botanics R&D Projects LK21306 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) GA206/09/1284 GA ČR - Czech Science Foundation (CSF) LO1204 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UEB-Q - RVO:61389030 UT WOS 000330969800059 DOI 10.1007/s10811-013-0062-z Annotation The seaweed extract Kelpak(A (R)) made from the kelp Ecklonia maxima is registered as a biostimulant for use in agriculture. It elicits many beneficial responses including improved root and shoot growth, higher yields and greater resistance to abiotic and biotic stresses. Previously, cytokinins, auxins and polyamines were identified in Kelpak(A (R)). The aim of the present study was to quantify other groups of plant growth regulators (PGRs)-abscisic acid (ABA), gibberellins (GAs) and brassinosteroids-that may be present in E. maxima and Kelpak(A (R)). Kelpak(A (R)) samples harvested between 2008 and 2010 and stored for up to 26 months were analysed using ultra performance liquid chromatography tandem mass spectrometry. ABA levels were below the limits of detection in E. maxima but were detected in low concentrations in Kelpak(A (R)), ranging from 0.31 to 20.70 pg mL(-1) Kelpak(A (R)). Eighteen GAs were found in E. maxima and Kelpak(A (R)) with concentrations from 187.54 to 565.96 pg mL(-1) Kelpak(A (R)). The biologically active GAs (GA(1), GA(3), GA(4), GA(5), GA(6) and GA(7)) comprised less than 3 % in Kelpak(A (R)). Although GA(13) (a final product in the metabolic pathway) was present in low concentrations in E. maxima, very high concentrations were present in Kelpak(A (R)). The brassinosteroids brassinolide (BL) and castasterone (CS) were identified in E. maxima and Kelpak(A (R)). Concentrations varied with harvest and storage time, ranging from 384.72 to 793.23 pg BL mL(-1) Kelpak(A (R)) and 62.84 to 567.51 pg CS mL(-1) Kelpak(A (R)). It is likely that this cocktail of natural PGRs present in Kelpak(A (R)) may act individually or in concert and thus contribute to the numerous favourable physiological responses elicited by Kelpak(A (R)) application to plants. Workplace Institute of Experimental Botany Contact David Klier, knihovna@ueb.cas.cz, Tel.: 220 390 469 Year of Publishing 2015
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