RRC ID 7185
Author Neily MH, Matsukura C, Maucourt M, Bernillon S, Deborde C, Moing A, Yin YG, Saito T, Mori K, Asamizu E, Rolin D, Moriguchi T, Ezura H.
Title Enhanced polyamine accumulation alters carotenoid metabolism at the transcriptional level in tomato fruit over-expressing spermidine synthase.
Journal J. Plant Physiol.
Abstract Polyamines are involved in crucial plant physiological events, but their roles in fruit development remain unclear. We generated transgenic tomato plants that show a 1.5- to 2-fold increase in polyamine content by over-expressing the spermidine synthase gene, which encodes a key enzyme for polyamine biosynthesis. Pericarp-columella and placental tissue from transgenic tomato fruits were subjected to (1)H-nuclear magnetic resonance (NMR) for untargeted metabolic profiling and high-performance liquid chromatography-diode array detection for carotenoid profiling to determine the effects of high levels of polyamine accumulation on tomato fruit metabolism. A principal component analysis of the quantitative (1)H NMR data from immature green to red ripe fruit showed a clear discrimination between developmental stages, especially during ripening. Quantification of 37 metabolites in pericarp-columella and 41 metabolites in placenta tissues revealed distinct metabolic profiles between the wild type and transgenic lines, particularly at the late ripening stages. Notably, the transgenic tomato fruits also showed an increase in carotenoid accumulation, especially in lycopene (1.3- to 2.2-fold), and increased ethylene production (1.2- to 1.6-fold) compared to wild-type fruits. Genes responsible for lycopene biosynthesis, including phytoene synthase, phytoene desaturase, and deoxy-d-xylulose 5-phosphate synthase, were significantly up-regulated in ripe transgenic fruits, whereas genes involved in lycopene degradation, including lycopene-epsilon cyclase and lycopene beta cyclase, were down-regulated in the transgenic fruits compared to the wild type. These results suggest that a high level of accumulation of polyamines in the tomato regulates the steady-state level of transcription of genes responsible for the lycopene metabolic pathway, which results in a higher accumulation of lycopene in the fruit.
Volume 168(3)
Pages 242-52
Published 2011-2-15
DOI 10.1016/j.jplph.2010.07.003
PII S0176-1617(10)00327-5
PMID 20708298
MeSH Carotenoids / metabolism* Fruit / enzymology* Fruit / genetics Lycopersicon esculentum / enzymology* Lycopersicon esculentum / genetics Plant Proteins / genetics Plant Proteins / metabolism Plants, Genetically Modified / enzymology* Plants, Genetically Modified / genetics Polyamines / metabolism Spermidine Synthase / genetics Spermidine Synthase / metabolism*
IF 2.833
Times Cited 20
WOS Category PLANT SCIENCES
Resource
Tomato TOMJPF00001