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2015 | 37 | 06 |
Tytuł artykułu

Regulation of storage lipid metabolism in developing and germinating lupin (Lupinus spp.) seeds

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The main storage compound in lupin seeds is protein, whose content can reach up to 45–50 % of dry matter. However, seeds of some lupin species can also contain quite a large amount of storage lipid. The range of lipid content in lupin seeds is from about 6 to about 20 % of dry matter. Storage lipid in developing seeds is synthesized mainly from sugars delivered by mother plants. During seed germination, one of the main end-products of storage lipid breakdown is also sugars. Thus, the sugar level in tissues is considered an important regulatory agent, during both lipid accumulation and lipid breakdown. Generally, in developing legume seeds, there is a strong negative relation between accumulation of storage protein and storage lipid. Results obtained in developing lupin cotyledons cultured in vitro pointed to the possibility of a positive relation between protein and lipid accumulation. Such a positive effect could be caused by nitrate. During lupin seed germination and seedling development, the utilization of storage lipid is enhanced under sugar deficiency conditions in tissues and is controlled at the gene expression level. However, under sugar starvation conditions, autophagy is significantly enhanced, and it can cause disturbances in storage lipid breakdown. The hypothesis of pexophagy, i.e., autophagic degradation of peroxisomes under sugar starvation conditions during lupin seed germination, has been taken into consideration. The flow of lipid-derived carbon skeletons to amino acids was discovered in germinating lupin seeds, and this process is clearly more intense in sucrose-fed embryo axes. At least four alternative or mutually complementary pathways of carbon flow from storage lipid to amino acids in germinating lupin seeds are postulated. The different strategies of storage compound breakdown during lupin seed germination are also discussed.
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  • Department of Plant Physiology, Faculty of Biology, Adam Mickiewicz University, Umultowska 89, 61-614, Poznan, Poland
  • Department of Plant Physiology, Faculty of Biology, Adam Mickiewicz University, Umultowska 89, 61-614, Poznan, Poland
  • Department of Plant Physiology, Faculty of Biology, Adam Mickiewicz University, Umultowska 89, 61-614, Poznan, Poland
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