Počet záznamů: 1

Analysis of Cytokinin Mutants and Regulation of Cytokinin Metabolic Genes Reveals Important Regulatory Roles of Cytokinins in Drought, Salt and Abscisic Acid Responses, and Abscisic Acid Biosynthesis

  1. 1.
    0365273 - UEB-Q 2012 RIV US eng J - Článek v odborném periodiku
    Nishiyama, R. - Watanabe, Y. - Werner, T. - Vaňková, Radomíra - Schmülling, T. - Tran, L. S. P.
    Analysis of Cytokinin Mutants and Regulation of Cytokinin Metabolic Genes Reveals Important Regulatory Roles of Cytokinins in Drought, Salt and Abscisic Acid Responses, and Abscisic Acid Biosynthesis.
    Plant Cell. Roč. 23, č. 6 (2011), s. 2169-2183 ISSN 1040-4651
    Výzkumný záměr: CEZ:AV0Z50380511
    Klíčová slova: TRANSGENIC TOBACCO PLANTS * WATER-STRESS * LEAF SENESCENCE
    Kód oboru RIV: ED - Fyziologie
    Impakt faktor: 8.987, rok: 2011

    Functional analyses of CK-deficient AtCKX overexpressers or atipt mutant provided direct evidence that CKs negatively regulate salt and drought stress signalings. All of the AtCKX overexpressers and the atipt1 3 5 7 mutant with reduced levels of various CKs exhibited a strong stress tolerant phenotype that was associated with increased cell membrane integrity and stability rather than stomatal density and ABA-mediated stomatal closure. Expression of all AtIPT genes and the majority of the AtCKX genes was repressed by stress and ABA treatments. Additionally, while CK deficiency increased sensitivity to exogenous ABA, it caused down-regulation of key ABA biosynthetic genes, leading to a significant reduction in endogenous ABA levels in CK-deficient plants relative to wild-type. These data demonstrate the importance of the ABA/CK ratio and a vital CK-dependent homeostatic control of ABA metabolism, ABA sensing and response.
    Trvalý link: http://hdl.handle.net/11104/0200556