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    Plant Biol (Stuttg). 2006 Sep;8(5):572-8. Epub 2006 Jul 5.

    Abscisic acid stimulates the expression of two isoforms of plasma membrane Ca2+-ATPase in Arabidopsis thaliana seedlings.

    Cerana M, Bonza MC, Harris R, Sanders D, De Michelis MI.

    Source

    Dipartimento di Biologia, Università degli Studi di Milano, Istituto di Biofisica del CNR-Sezione di Milano, Via Celoria 26, 20133 Milano, Italy. cristina.bonza@unimi.it

    Abstract

    AT-ACA8 and AT-ACA9 are two plasma membrane (PM) Ca (2+)-ATPases of ARABIDOPSIS THALIANA. In this article the expression of AT-ACA8, AT-ACA9, and of AT-ACA10, a third isoform of Ca (2+)-ATPase closely related to PM Ca (2+)-ATPases, was analysed and the effect of the hormone abscisic acid (ABA) on the expression level of PM Ca (2+)-ATPase specific transcripts was investigated. In adult plants of A. THALIANA, AT-ACA8 and AT-ACA10 are expressed in all organs considered whereas AT-ACA9 is expressed only in flowers. All isoforms of PM Ca (2+)-ATPases can be detected in young seedlings but the amount of AT-ACA9 mRNA is much lower than those of AT-ACA8 and AT-ACA10. ABA markedly and rapidly stimulates the expression of both AT-ACA8 and AT-ACA9 genes in young seedlings but not that of AT-ACA10. ABA also increases the level of AT-ACA8 protein at the PM, suggesting a role for PM Ca (2+)-ATPases in ABA signalling.

    PMID:
    16821193
    [PubMed - indexed for MEDLINE]

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