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Lipids in grain tissues of oat (Avena sativa): differences in content, time of deposition, and fatty acid composition
Authors:Banas Antoni  Debski Henryk  Banas Walentyna  Heneen Waheeb K  Dahlqvist Anders  Bafor Maureen  Gummeson Per-Olov  Marttila Salla  Ekman Asa  Carlsson Anders S  Stymne Sten
Institution:Institute of Biology and Environmental Protection, AP, ul Arciszewskiego 22, 76-200, Slupsk, Poland.
Abstract:Oat (Avena sativa) is unusual in comparison with other cereals since there are varieties with up to 18% oil content. The lipid content and fatty acid composition in different parts of the grain during seed development were characterized in cultivars Freja (6% oil) and Matilda (10% oil), using thin-layer and gas chromatography, and light and electron microscopy. The majority of lipids (86-90%) were found in the endosperm. Ninety-five per cent of the higher oil content of cv. Matilda compared with cv. Freja was due to increased oil content of the endosperm. Up to 84% of the lipids were deposited during the first half of seed development, when seeds where still green with a milky endosperm. Microscopy studies revealed that whereas oil bodies of the embryo and scutellum still contained a discrete shape upon grain maturation, oil bodies of the endosperms fused upon maturation and formed smears of oil.
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