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Gene Review:

PSY - phytoene synthase

Arabidopsis thaliana

Synonyms: PHYTOENE SYNTHASE

von Lintig, J. et al.

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High impact information on PSY

The response to far-red light is completely abolished in the phyA mutant, showing that PHYA mediates the increase in PSY transcript levels under these light conditions [1].
In the phyB mutant, the red light response is normal, indicating that PSY expression is not controlled by PHYB but by other light-stable phytochromes [1].
With light, there is an up-regulation of PSY expression, the first gene within the carotenoid biosynthetic pathway, while PDS and GGPS expression levels remain constant [1].
Therefore, it is proposed that up-regulation of PSY mRNA levels leads to an increased capacity for the formation of carotenoids [1].
GGPS encodes a key enzyme in plastid isoprenoid metabolism, while the products of PSY and PDS catalyse the subsequent steps in carotenoid biosynthesis [1].

Associations of PSY with chemical compounds

Measurement of chlorophylls and carotenoids under the same light regimes shows that the up-regulation of PSY expression does not necessarily result in an increase of the carotenoid content [1].

References

Light-dependent regulation of carotenoid biosynthesis occurs at the level of phytoene synthase expression and is mediated by phytochrome in Sinapis alba and Arabidopsis thaliana seedlings. von Lintig, J., Welsch, R., Bonk, M., Giuliano, G., Batschauer, A., Kleinig, H. Plant J. (1997) [Pubmed]

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