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Type: Journal article
Title: Effects of temperature and gibberellic acid on 4-desmethylsterol composition of Avena sativa stem segments
Author: Jusaitis, M.
Paleg, L.
Aspinall, D.
Citation: Phytochemistry: the international journal of plant chemistry, plant biochemistry and molecular biology, 1981; 20(3):417-423
Publisher: Pergamon Press
Issue Date: 1981
ISSN: 0031-9422
Statement of
Manfred Jusaitis, Leslie G. Paleg, Donald Aspinall
Abstract: Of the three morphological subunits of Avena sativa stem segments (node, leaf-sheath and internode) examined, internodes constituted the richest source of phospholipids and sterols, yielding almost double the concentration of lipid found in the leaf-sheath. The phospholipid compositions of nodes and internodes were similar, comprising mostly phosphatidylcholine (PC) and phosphatidylethanolamine (PE), with linoleic, linolenic and palmitic acids as the predominant component fatty acids. Leaf-sheath tissue contained mainly PE, with equally high amounts of palmitic, linoleic and linolenic acids. β-Sitosterol and cholesterol were the major 4-desmethylsterols of the internode, while β-sitosterol was predominant in the node and leaf-sheath tissues. The growth temperature of segments prior to isolation produced its major effect on the concentration of stigmasterol, which decreased markedly with temperature. The sitosterol/stigmasterol ratio increased significantly as temperature decreased. Stem segments isolated from plants treated with gibberellic acid (GA3) for 3 weeks, showed a significant reduction in the amounts of 4-desmethyl sterols on a dry wt basis when compared with control segments. However, when stem segments were incubated with GA3 for 20 hr, no change in 4-desmethylsterol composition or concentration was observed, even though significant growth in response to GA3 occurred. © 1981.
Keywords: Avena sativa
stem segments
fatty acids
gibberellic acid
Rights: Copyright © 1981
DOI: 10.1016/S0031-9422(00)84157-6
Appears in Collections:Aurora harvest 4
Earth and Environmental Sciences publications

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