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Endogenous Auxin Profile in the Christmas Rose (Helleborus niger L.) Flower and Fruit: Free and Amide Conjugated IAA
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SYSNO ASEP 0375171 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Endogenous Auxin Profile in the Christmas Rose (Helleborus niger L.) Flower and Fruit: Free and Amide Conjugated IAA Author(s) Brcko, A. (HR)
Pěnčík, Aleš (UEB-Q) ORCID, RID, SAI
Magnus, V. (HR)
Prebeg, T. (HR)
Mlinaric, S. (HR)
Antunovic, J. (HR)
Lepeduš, H. (HR)
Cesar, V. (HR)
Strnad, Miroslav (UEB-Q) RID, ORCID
Rolčík, Jakub (UEB-Q)
Salopek-Sondi, B. (HR)Source Title Journal of Plant Growth Regulation. - : Springer - ISSN 0721-7595
Roč. 31, č. 1 (2012), s. 63-78Number of pages 16 s. Language eng - English Country US - United States Keywords Auxin ; Indole-3-acetic acid ; Amide conjugates ; Christmas rose ; Helleborus niger L. ; Flower and fruit development ; Perianth greening ; Peduncle elongation ; Vascular system Subject RIV EF - Botanics R&D Projects KAN200380801 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) UT WOS 000300674500007 DOI 10.1007/s00344-011-9220-1 Annotation The reproductive development of the Christmas rose (Helleborus niger L.) is characterized by an uncommon feature in the world of flowering plants: after fertilization the white perianth becomes green and photosynthetically active and persists during fruit development. In the flowers in which fertilization was prevented by emasculation (unfertilized) or entire reproductive organs were removed (depistillated), the elongation of the peduncle was reduced by 20–30%, and vascular development, particularly lignin deposition in sclerenchyma, was arrested. Chlorophyll accumulation in sepals and their photosynthetic efficacy were up to 80% lower in comparison to fertilized flowers. Endogenous auxins were investigated in floral and fruit tissues and their potential roles in these processes are discussed. Analytical data of free indole-3-acetic acid, indole-3-ethanol (IEt), and seven amino acid conjugates were afforded by LC-MS/MS in floral tissues of fertilized as well as unfertilized and depistillated flowers. Among amino acid conjugates, novel ones with Val, Gly, and Phe were identified and quantified in the anthers, and in the fruit during development. Reproductive organs before fertilization followed by developing fruit at post-anthesis were the main source of auxin. Tissues of unfertilized and depistillated flowers accumulated significantly lower levels of auxin. Upon depistillation, auxin content in the peduncle and sepal was decreased to 4 and 45%, respectively, in comparison to fruit-bearing flowers. This study suggests that auxin arising in developing fruit may participate, in part, in the coordination of the Christmas rose peduncle elongation and its vascular development. Workplace Institute of Experimental Botany Contact David Klier, knihovna@ueb.cas.cz, Tel.: 220 390 469 Year of Publishing 2013
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