Lipid composition in mosses is characterized by the presence of a large amount of neutral lipids and polyunsaturated very-long-chain fatty acids, sucu as arachidonic acid and eicosapentaenoic acid. Such characteristics in lipid composition is thought to be important for survive of mosses under various kinds of environmental stresses. A recent establishment of an Expression Sequence Tag (EST) database provides a novel strategy to analyze the physiological significance of unique lipid composition and mechanisms of the lipid metabolism in mosses, such as Physcomitrella patens and Ceratodon purpureus. By comparison of the Physcomitrella EST database with the whole genome sequence of Arabidopsis thaliana, we found that Physcomitrellgenes that are involved in the regulation of the lipid metabolism were mostly similar to those in A. thaliana, except for genes for the production of storage lipids and the oxylipin metabolism. It remains to elucidate why the lipid compositions of these two species are different, despite the high similarity of genes for the lipid metabolism. Analysis of phototropism in C. purpureus has demonstrated the importance of light-dependent activation of phosphatidylinositol-specific phospholipase C (PI-PLC), however almost is unclear to understand how PI-PLC regulates the phototropism. Studies on the molecular bases of above characteristics are necessary to understand the physiological importance of the lipid composition and lipid metabolism in mosses.
Weitere Kapitel dieses Buchs durch Wischen aufrufen
- Lipid Metabolism in Mosses
- Springer Netherlands
- Chapter 8
Systemische Notwendigkeit zur Weiterentwicklung von Hybridnetzen