What question did this study set out to answer?

To characterize the function, regulatory mechanisms, and evolutionary divergence of a third phytoene synthase gene (OsPSY3) compared to OsPSY1 and OsPSY2 in rice under diverse environmental conditions.

March 7, 2008PLANT PHYSIOLOGYOpen Access

A Third Phytoene Synthase Is Devoted to Abiotic Stress-Induced Abscisic Acid Formation in Rice and Defines Functional Diversification of Phytoene Synthase Genes

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To characterize the function, regulatory mechanisms, and evolutionary divergence of a third phytoene synthase gene (OsPSY3) compared to OsPSY1 and OsPSY2 in rice under diverse environmental conditions.
Profiled tissue-specific transcript abundance of OsPSY1, OsPSY2, and OsPSY3 in rice (Oryza sativa) across chloroplast development and varying light regimes.
Measured gene expression following drought, salt treatment, and exogenous abscisic acid (ABA) application alongside 9-cis-epoxycarotenoid dioxygenases (NCEDs).
Characterized promoter cis-acting elements, gene architecture, and 5' untranslated regions to trace the evolutionary history of the phytoene synthase family.
OsPSY3 expression is unaffected by light but is markedly induced during drought and salinity stress, especially in root tissues, paralleling the upregulation of OsNCEDs.
Exogenous ABA application directly induces OsPSY3 and OsNCED expression, demonstrating positive feedback regulation mediated by ABA-responsive promoter elements.
Promoter and structural analyses confirm OsPSY1 reflects an ancestral monocot-dicot lineage, whereas OsPSY2 and OsPSY3 diverged through duplication from OsPSY1.

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Implication

Functional analysis reveals abiotic stress-induced abscisic acid synthesis by phytoene synthase 3 in rice, indicating functional diversification among paralogous plant genes.

Cite This Study

Welsch et al. (2008) studied this question.

synapsesocial.com/papers/6a7c19727627ead3dcdf8221 https://doi.org/10.1104/pp.108.117028

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Implication

Functional analysis reveals abiotic stress-induced abscisic acid synthesis by phytoene synthase 3 in rice, indicating functional diversification among paralogous plant genes.

A Third Phytoene Synthase Is Devoted to Abiotic Stress-Induced Abscisic Acid Formation in Rice and Defines Functional Diversification of Phytoene Synthase Genes

Key Points

Discussion

Implication

Cite This Study

A Third Phytoene Synthase Is Devoted to Abiotic Stress-Induced Abscisic Acid Formation in Rice and Defines Functional Diversification of Phytoene Synthase Genes

Key Points

Discussion

Implication

Cite This Study

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