Changes in cytokinin content and altered cytokinin homeostasis in AtCKX1 and AtCKX2-overexpressing centaury (Centaurium erythraea Rafn.) plants grown in vitro

0446124 - ÚEB 2016 RIV NL eng J - Journal Article
Trifunovic, M. - Motyka, Václav - Cingel, A. - Subotic, A. - Jevremovic, S. - Petric, M. - Holík, Josef - Malbeck, Jiří - Dobrev, Petre - Dragicevic, I.
Changes in cytokinin content and altered cytokinin homeostasis in AtCKX1 and AtCKX2-overexpressing centaury (Centaurium erythraea Rafn.) plants grown in vitro.
Plant Cell, Tissue and Organ Culture. Roč. 120, č. 2 (2015), s. 767-777. ISSN 0167-6857. E-ISSN 1573-5044
R&D Projects: GA ČR(CZ) GAP506/11/0774
Institutional support: RVO:61389030
Keywords : Centaurium erythraea Rafn. * Cytokinin * Cytokinin oxidase/dehydrogenase
Subject RIV: EF - Botanics
Impact factor: 2.390, year: 2015

The plant hormones cytokinins (CKs) regulate a number of physiological processes. Their homeostasis is controlled by the rate of de novo synthesis and the rate of catabolism. The aim of this work was to analyze the content of total as well as individual groups of endogenous CKs in AtCKX1 and AtCKX2-overexpressing centaury (Centaurium erythraea Rafn.) plants grown in vitro. Transgenic CKX plants represent a suitable model system for studying physiological and morphological processes controlled by CKs. In this work we clearly demonstrate a significant effect of AtCKX transgenes on CK metabolism in transgenic centaury plants. However, shoots and roots of only one AtCKX1 line and three AtCKX2 lines with a significant reduction of bioactive CKs were obtained. We also show that changes in the CKs metabolism considerably affected endogenous indole-3-acetic acid (IAA) levels in plant tissues. All analyzed transgenic AtCKX centaury lines exhibited decreased amount of endogenous IAA in shoots as well as in roots. Consequently, the IAA/bioactive CK forms ratios showed a significant variation in the shoots and roots of all analyzed AtCKX centaury transformants.
Permanent Link: http://hdl.handle.net/11104/0248088