Počet záznamů: 1

Ethylene Interacts with Abscisic Acid to Regulate Endosperm Rupture during Germination: A Comparative Approach Using Lepidium sativum and Arabidopsis thaliana

  1. 1.
    0340951 - UEB-Q 2010 RIV US eng J - Článek v odborném periodiku
    Linkies, A. - Müller, L. - Morris, K. - Turečková, Veronika - Wenk, M. - Cadman, C. S. C. - Corbineau, F. - Strnad, Miroslav - Lynn, J. R . - Finch-Savage, W. E. - Leubner-Metzger, G.
    Ethylene Interacts with Abscisic Acid to Regulate Endosperm Rupture during Germination: A Comparative Approach Using Lepidium sativum and Arabidopsis thaliana.
    Plant Cell. Roč. 21, č. 12 (2009), s. 3803-3822 ISSN 1040-4651
    Výzkumný záměr: CEZ:AV0Z50380511
    Klíčová slova: SEED DORMANCY RELEASE * GIBBERELLIN BIOSYNTHESIS * FEEDBACK-REGULATION
    Kód oboru RIV: EF - Botanika
    Impakt faktor: 9.293, rok: 2009

    The micropylar endosperm cap covering the radicle in the mature seeds of most angiosperms acts as a constraint that regulates seed germination. Here, we report on a comparative seed biology study with the close Brassicaceae relatives Lepidium sativum and Arabidopsis thaliana showing that ethylene biosynthesis and signaling regulate seed germination by a mechanism that requires the coordinated action of the radicle and the endosperm cap. The larger seed size of Lepidium allows direct tissue-specific biomechanical, biochemical, and transcriptome analyses. We show that ethylene promotes endosperm cap weakening of Lepidium and endosperm rupture of both species and that it counteracts the inhibitory action of abscisic acid (ABA) on these two processes. Cross-species microarrays of the Lepidium micropylar endosperm cap and the radicle show that the ethylene-ABA antagonism involves both tissues and has the micropylar endosperm cap as a major target.
    Trvalý link: http://hdl.handle.net/11104/0184087