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著者 | Welsch,R., Wust,F., Bar,C., Al-Babili,S. and Beyer,P. | |
タイトル | A third phytoene synthase is devoted to abiotic stress-induced abscisic acid formation in rice and defines functional diversification of phytoene synthase genes | |
Abstract: We here report on the characterization of a novel third phytoene synthase gene (PSY) in rice (Oryza sativa), OsPSY3, and on the differences among all three PSY genes with respect to the tissue-specific expression and regulation upon various environmental stimuli. The two already known PSYs are under phytochrome control and involved in carotenoid biosynthesis in photosynthetically active tissues and exhibit different expression patterns during chloroplast development. In contrast, OsPSY3 transcript levels are not affected by light and show almost no tissue-specific differences. Rather, OsPSY3 transcripts are up-regulated during increased abscisic acid (ABA) formation upon salt treatment and drought, especially in roots. The simultaneous induction of genes encoding 9-cis-epoxycarotenoid dioxygenases (NCEDs), involved in the initial steps of ABA biosynthesis, indicate that decreased xanthophyll levels are compensated by the induction of the third PSY gene. Furthermore, OsPSY3 and the OsNCEDs investigated were also induced by the application of ABA, indicating positive feedback regulation. The regulatory differences are mirrored by cis-acting elements in the corresponding promoter regions, with light-responsive elements for OsPSY1 and OsPSY2 and an ABA-response element as well as a coupling element for OsPSY3. The investigation of the gene structures and 5' untranslated regions revealed that OsPSY1 represents a descendant of an ancient PSY gene present in the common ancestor of monocots and dicots. Since the genomic structures of OsPSY2 and OsPSY3 are comparable, we conclude that they originated from the most recent common ancestor, OsPSY1. |
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掲載誌 | Plant Physiol. | |
Country | Germany | |
刊数 | 147(1) | |
ページ | 367-380 | |
発刊年 | 2008 | |
PubMed ID | 18326788 | |
PubMed Central ID | - | |
DOI | 10.1104/pp.108.117028 | |
URL | - | |
関連情報 | ||
遺伝子 | ABA1 NCED1 NCED2 NCED3 PSY1 PSY2 PSY3 | |
INSD | FJ214953 | |
系統 |
野生イネ コアコレクション |
- |
突然変異系統(遺伝研 Collection) | - | |
種子不稔系統 | - | |
致死変異体系統 | - | |
組織別発生段階 - 突然変異系統(遺伝子) |
- | |
栽培イネ品種(遺伝研 Collection) | - | |
組織別発生段階 | - |