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Membrane phospholipids remodeling upon imbibition in Brassica napus L. seeds.

Abstract：

:Successful seed germination depends on the rapid repair of cell membrane damaged by dry storage. However, little is known about the reorganization of lipids during this process. In this study, the changes of intracellular redox environment, cell membrane integrity, lipid composition, and expression of genes related to phospholipid metabolism were assessed during imbibition of Brassica napus seeds. A total number of 443 lipids belonging to 7 categories were detected by ultra-performance liquid chromatography/quadrupole time-of-flight mass spectrometry (UPLC-QTOF-MS/MS). In the 24 h-imbibed seeds, the relative content of triacylglycerol was lower than in dry seeds, while the relative content of phosphatidylcholine (PC), phosphatidylethanolamine (PE), phosphatidylinositol (PI), and phosphatidylserine (PS), especially PC (36:2, number of carbons in the acyl chains: number of double bonds), PC (36:3), and PE (36:3) were higher than those in dry seeds. Meanwhile, the content and unsaturation levels of phospholipids increased, indicating membrane lipids remodeling during seed imbibition. The plasma membrane integrity, which was measured by the relative electrolyte leakage (REL) of the membrane and FM4-64 fluorescent dye, was improved upon imbibition, confirming that cell membrane was repaired after 24 h-imbibition. The reduction of H2O2 content, redox potential, and malondialdehyde (MDA) content indicated that the degree of membrane lipid peroxidation was significantly decreased upon imbibition. Gene expression analysis showed that the differential expression of genes for key enzymes occurred in the plateau phase of the imbibition curve, i.e. after 8 h-to 24 h-imbibition. Moreover, the differential expression of genes such as those encoding phospholipase C (PLC), phospholipase D (PLD), triacylglycerol lipase (TAG lipase), choline/ethanolamine phosphotransferase (CEPT), and phosphatidylserine synthase (PTDSS2) during imbibition indicated that membrane lipid remodeling was related to complex metabolic pathways, among which the degradation of triacylglycerol and the synthesis of phospholipids using diacylglycerol might play an important role during membrane remodeling.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Lin YX,Xin X,Yin GK,He JJ,Zhou YC,Chen JY,Lu XX

doi

10.1016/j.bbrc.2019.05.100

subject

Has Abstract

pub_date

2019-07-23 00:00:00

pages

289-295

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(19)30980-5

journal_volume

515

pub_type

杂志文章

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