Mobilization of storage lipid

Scheme 2 Cascade of events implicated in the linoleate 13>lipoxygenase-triggered mobilization of storage lipids in germinating seeds (according to the hypothesis of Feussner et al. [63]) ...

Alvarez HM, Kalscheuer R, Steinbuchel A (2000) Accumulation and mobilization of storage lipids by Rhodococcus opacus PD630 and Rhodococcus ruber NCIMB 40126. Appl Microbiol Biotechnol 54(2) 218-223... 

Feussner, I., Wastemack, C., Kindi, K., and Kuhn, H. 1995. Lipoxygenase-catalyzed oxygenation of storage lipids is implicated in lipid mobilization during germination. Proc. Natl. Acad. Sci. USA 92, 11849-11855. 

Under conditions of nutritional excess, fatty acids are absorbed by adipose tissue where they are converted to storage lipids in the form of triacylglycerols. The triacylglycerols can be mobilized at a later time, when the carbohydrate... 

Since plants are not mobile, and since photosynthesis provides fixed carbon on a regular basis, plant requirements for storage lipid as an efficient, light weight energy reserve are less acute than those of animals. 

See also Adipocytes, Fat Absorption and Transport, Bile Salts and Emulsion of Fats, Mobilization of Stored Fat, Energy Storage, Triacylglycerol Synthesis, Action of Insulin, Lipids... 

Vereshchagin, AG. Biochemistry of triglycerides. M Nauka, 1972, 1-308. (In Russian) Graham, I. Seed storage oil mobilization. Annu. Rev. Plant Biol, 2008, 59,115-142. Berezhnaya, GA Ozerinina, OV Yeliseev, IP Tsydendambaev, VD Vereshchagin, AG. Developmental changes in the absolute content and fatty acid composition of acyl lipids of sea buckthorn fruits. Plant Physiol, Biochem., 1993, 31, 323-332. 

There are several possible reasons why storage lipid is mobilized and the glyoxylate cycle stimulated following nitrate addition to N-starved cultures. These are listed as follows 1.) to replenish, via gluconeogenesis, carbohydrates exhausted during nitrate assimilation 2.) to replenish, anaplerotically, TCA cycle intermediates drawn off for protein synthesis during rapid nitrate assimilation 3.) to increase, via malate glycolysis, the amount of cytosolic NADH available for NR. These possibilities are detailed in Fig.3. 

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