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https://hdl.handle.net/2440/78022
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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 Responsibility: | 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 Gramineae oat stem segments temperature phospholipids fatty acids 4-desmethylsterols gibberellic acid |
Rights: | Copyright © 1981 |
DOI: | 10.1016/S0031-9422(00)84157-6 |
Published version: | http://dx.doi.org/10.1016/s0031-9422(00)84157-6 |
Appears in Collections: | Aurora harvest 4 Earth and Environmental Sciences publications |
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