期刊
BIOCHEMISTRY-MOSCOW
卷 71, 期 4, 页码 461-465出版社
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S000629790604016X
关键词
Mesembryanthemum crystallinum; salt stress; adaptation; CAM metabolism; DNA; methylation; CpNpG sequences; PEP carboxylase and rRNA genes; satellite DNA
Under salt stress conditions, the level of CpNpG-methylation (N is any nucleoside) of the nuclear genome of the facultative halophyte Mesembryanthemum crystallinum in the CCWGG sequences (W = A or T) increases two-fold and is coupled with hypermethylation of satellite DNA on switching-over Of C-3-photosynthesis to the crassulacean acid metabolism (CAM) pathway of carbon dioxide assimilation. The methylation pattern of the CCWGG sequences is not changed in both the 5'-promoter region of the gene of phosphoenolpyruvate carboxylase, the key enzyme Of C-4-photosynthesis and CAM, and in the nuclear ribosomal DNA. Thus, a specific CpNpG-hypermethylation of satellite DNA has been found under conditions of expression of a new metabolic program. The functional role of the CpNpG-hypermethylation of satellite DNA is probably associated with formation of a specialized chromatin structure simultaneously regulating expression of a large number of genes in the cells of M. crystallinum plants on their adaptation to salt stress and switching-over to CAM metabolism.
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