Lipid mobilization in dormant and nondormant caryopses of yellow foxtail (Setaria lutescens)

Lehle, F.R. and Staniforth, D.W. and Stewart, C.R. (1983) Lipid mobilization in dormant and nondormant caryopses of yellow foxtail (Setaria lutescens). Weed Science, 31 (1). pp. 28-36.

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Lipid bodies, which contain triacylglyceride, the major lipid reserve of S. lutescens[=S. pumila], were found by electron microscopy to be nearly spherical, to have an av. diam. of 0.5 mu m and to be concentrated in the embryo axis, scutellum and aleurone layer. Lipid content of unimbibed seed and caryopses was about 6.4 and 11%, resp., on a fresh wt. basis in dormant and non-dormant seeds. Saponifiable lipids accounted for 95% of the total in non-dormant seeds and declined by 23% during the first 6 days of germination in the dark at 25 deg C, while free fatty acids accumulated and accounted for 22% of the total saponifiable lipid remaining after 6 days. Alkaline lipase activity appeared about 24 h after the onset of imbibition. In dormant caryopses similarly treated, there were no changes in lipid content or lipase activity. The delay in activation of lipid metabolism in germinating caryopses suggested that control of triacylglyceride degradation is not a primary cause of seed dormancy in S. lutescens

Item Type: Article
Author Affiliation: Department of Horticulture, Pesticide Research Center, Michigan State University, East Lansing, MI 48824, USA
Subjects: Plant Physiology and Biochemistry > Plant Physiology
Plant Physiology and Biochemistry > Biochemistry
Divisions: Millet
Depositing User: Ms K Syamalamba
Date Deposited: 29 May 2012 08:45
Last Modified: 29 May 2012 08:45

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