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Authors Oku, H; Baba, S; Koga, H; Takara, K; Iwasaki, H
Author Full Name Oku, H; Baba, S; Koga, H; Takara, K; Iwasaki, H
Title Lipid composition of mangrove and its relevance to salt tolerance
Source JOURNAL OF PLANT RESEARCH
Language English
Document Type Article
Author Keywords lipid composition; mangrove; phytosterol; root; salt tolerance; terpenoid
Keywords Plus CULTURED HUMAN KERATINOCYTES; BARLEY ROOTS; DIFFERENTIATION; TRITERPENOIDS; PROTEIN; ESTERS; BARK; ACID
Abstract Lipid compositions of mangrove trees were studied in relation to the salt-tolerance mechanism. Leaves and roots were obtained from seven mature mangrove trees on Iriomote Island, Okinawa: Bruguiera gymnorrhiza, Rhizophora stylosa, Kandelia candel, Lumnitzera racemosa, Avicennia marina, Pemphis acidula and Sonneratia alba. Lipids of mangrove leaves mainly consisted of 11 lipid classes: polar lipids, unknown (UK) 1-6, sterols, triacyl glycerols, wax ester and sterol ester (UK 3 and 4 were found to be tri-terpenoid alcohol in this study). Of these lipid classes, sterol ester was the main lipid in all species comprising 17.6-33.7% of total lipids. Analysis of the chemical structure found that the sterol esters mainly consisted of fatty acid esters of tri-terpenoid alcohols. One major tri-terpenoid alcohol was identified to be lupeol by interpretation of infrared resonance, nuclear magnetic resonance and mass spectrometry. Because of the unique anatomy of the mangrove root, lipid analyses were made separately for epidermis, cortex and innermost stele, respectively. The concentration of free tri-terpenoid alcohols showed a higher tendency in the outside part than in the inside portion of the roots, suggesting their protective roles. Relevance of lipid composition to salt tolerance was studied with propagules of K. candel and B. gymnorrhiza planted with varied salt concentrations. The proportions of free tri-terpenoids increased with salinity in both leaves and roots of K. candel, and only in roots of B. gymnorrhiza. No salt-dependent changes were noted in the phospholipid and fatty acid compositions in both species. These findings suggested that salt stress specifically modulated the terpenoid concentrations in mangroves.
Author Address Univ Ryukyus, Ctr Mol Biosci, Div Mol Biotechnol, Nishihara, Okinawa 9030213, Japan; Univ Ryukyus, Coll Agr, Nishihara, Okinawa 9030213, Japan
Reprint Address Oku, H (corresponding author), Univ Ryukyus, Ctr Mol Biosci, Div Mol Biotechnol, Nishihara, Okinawa 9030213, Japan.
ORCID Number Iwasaki, Hironori/0000-0001-6695-1819
Times Cited 29
Total Times Cited Count (WoS, BCI, and CSCD) 33
Publisher SPRINGER-VERLAG TOKYO
Publisher City TOKYO
Publisher Address 3-3-13, HONGO, BUNKYO-KU, TOKYO, 113-0033, JAPAN
ISSN 0918-9440
29-Character Source Abbreviation J PLANT RES
ISO Source Abbreviation J. Plant Res.
Publication Date FEB
Year Published 2003
Volume 116
Issue 1
Beginning Page 37
Ending Page 45
Digital Object Identifier (DOI) 10.1007/s10265-002-0069-z
Page Count 9
Web of Science Category Plant Sciences
Subject Category Plant Sciences
Document Delivery Number 649VE
Unique Article Identifier WOS:000181228000006
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