期刊
JOURNAL OF EXPERIMENTAL BOTANY
卷 66, 期 7, 页码 1907-1918出版社
OXFORD UNIV PRESS
DOI: 10.1093/jxb/eru535
关键词
Lipidomics; lipid remodeling; microRNA399; phosphorus starvation; PHO2; PHR1; triacylglycerol
资金
- German Federal Ministry for Education and Research (PLANT-KBBE) [0315462]
- Max-Planck Society
- Samuel Roberts Noble Foundation
Lipid remodeling is one of the most dramatic metabolic responses to phosphorus (P) starvation. It consists of the degradation of phospholipids to release the phosphate needed by the cell and the accumulation of glycolipids to replace phospholipids in the membranes. It is shown that PHR1, a well-described transcriptional regulator of P starvation of the MYB family, largely controls this response. Glycerolipid composition and the expression of most lipid-remodeling gene transcripts analysed were altered in the phr1 mutant under phosphate starvation in comparison to wild-type plants. In addition to these results, the lipidomic characterization of wild-type plants showed two novel features of the lipid response to P starvation for Arabidopsis. Triacylglycerol (TAG) accumulates dramatically under P starvation (by as much as similar to 20-fold in shoots and similar to 13-fold in roots), a response known to occur in green algae but hardly known in plants. Surprisingly, there was an increase in phosphatidylglycerol (PG) in P-starved roots, a response that may be adaptive as it was suppressed in the phr1 mutant.
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