Ethylene promotes hyponastic growth through interaction with ROTUNDIFOLIA3/CYP90C1 in Arabidopsis

0394042 - ÚEB 2014 RIV GB eng J - Článek v odborném periodiku
Polko, J. - Pierik, R. - Zanten, M. - Tarkowská, Danuše - Strnad, Miroslav - Voesenek, L. A. C. J. - Peeters, A. J. M.
Ethylene promotes hyponastic growth through interaction with ROTUNDIFOLIA3/CYP90C1 in Arabidopsis.
Journal of Experimental Botany. Roč. 64, č. 2 (2013), s. 613-624. ISSN 0022-0957. E-ISSN 1460-2431
Grant CEP: GA AV ČR IAA400550801
Grant ostatní: GA MŠk(CZ) ED0007/01/01
Program: ED
Výzkumný záměr: CEZ:AV0Z50380511
Klíčová slova: Arabidopsis * brassinosteroids * cell expansion
Kód oboru RIV: CC - Organická chemie
Impakt faktor: 5.794, rok: 2013

Upward leaf movement, called hyponastic growth, is employed by plants to cope with adverse environmental conditions. Ethylene is a key regulator of this process and, in Arabidopsis thaliana, hyponasty is induced by this phytohormone via promotion of epidermal cell expansion in a proximal zone of the abaxial side of the petiole. ROTUNDIFOLIA3/CYP90C1 encodes an enzyme which was shown to catalyse C-23 hydroxylation of several brassinosteroids (BRs) phytohormones involved in, for example, organ growth, cell expansion, cell division, and responses to abiotic and biotic stresses. This study tested the interaction between ethylene and BRs in regulating hyponastic growth. A mutant isolated in a forward genetic screen, with reduced hyponastic response to ethylene treatment, was allelic to rot3. The cause of the reduced hyponastic growth in this mutant was examined by studying ethyleneBR interaction during local cell expansion, pharmacological inhibition of BR synthesis and ethylene effects on transcription of BR-related genes. This work demonstrates that rot3 mutants are impaired in local cell expansion driving hyponasty. Moreover, the inhibition of BR biosynthesis reduces ethylene-induced hyponastic growth and ethylene increases sensitivity to BR in promoting cell elongation in Arabidopsis hypocotyls. Together, the results show that ROT3 modulates ethylene-induced petiole movement and that this function is likely BR related.
Trvalý link: http://hdl.handle.net/11104/0222374