Impact of phenol on the glycerophospholipid turnover and potential role of circadian clock in the plant response against this pollutant in tobacco hairy roots

SOSA ALDERETE L.; FLOR S.; LUCANGIOLI S.; AGOSTINI E.

PLANT PHYSIOLOGY AND BIOCHEMISTRY

ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER

Lugar: Paris; Año: 2020 vol. 151 p. 411 - 420

0981-9428

Glycerophospholipids (GPLs) from cell membranes (CM) are a proper source for the synthesis of lipid messengersable to activate signal pathways that will define the plant survival under changing and stressful environmentalconditions. Little is known about how GPLs metabolism (GPLsM) is regulated and the effects of phenol treatmenton GPLs composition. In this work, we studied the effects of phenol both on GPLs turnover and on the expressionof GPLsM-related genes potentially regulated by the circadian clock, using tobacco hairy root cultures (HRC).Phenol decreased the total PC levels and increased PE, PG and CL levels in the dark phase. Different molecularspecies of PC and PE showed the same trend than the total PC and PE upon phenol treatment. Besides, significantdifferences in the expression of all studied genes related to GPLsM were found. NtCCT2 expression was affectedat all analyzed times while NtPECT1 and NtAAPT1 showed similar expression patterns. NtCDS1, NtPGPS2 andNtCLS genes showed significant and differential expression profiles both in untreated and treated HRC. PECT1and NtPGPS2 genes seem to conserve a circadian expression profile mainly in untreated HRC. However, phenolwas able to modify the GPLs composition and the expression of genes related to GPLs synthesis. The GPLsmodification could be explained by the up-regulation of NtPECT1, NtAAPT1 and NtCLS genes during the darkphase, suggesting for being a crucial moment for HRC to trigger an adaptive response against this organic pollulant.