Ethylene and auxin interaction in the control of adventitious rooting in Arabidopsis thaliana
Articolo
Data di Pubblicazione:
2016
Citazione:
Ethylene and auxin interaction in the control of adventitious rooting in Arabidopsis thaliana / A. Veloccia, L. Fattorini, F. Della Rovere, A. Sofo, S. D'Angeli, C. Betti, G. Falasca, M.M. Altamura. - In: JOURNAL OF EXPERIMENTAL BOTANY. - ISSN 0022-0957. - 67:22(2016 Nov 09), pp. 6445-6458. [10.1093/jxb/erw415]
Abstract:
Adventitious roots (ARs) are post-embryonic roots essential for plant survival and propagation. Indole-3-acetic acid
(IAA) is the auxin that controls AR formation; however, its precursor indole-3-butyric acid (IBA) is known to enhance
it. Ethylene affects many auxin-dependent processes by affecting IAA synthesis, transport and/or signaling, but its
role in AR formation has not been elucidated. This research investigated the role of ethylene in AR formation in darkgrown
Arabidopsis thaliana seedlings, and its interaction with IAA/IBA. A number of mutants/transgenic lines were
exposed to various treatments, and mRNA in situ hybridizations were carried out and hormones were quantified. In
the wild-type, the ethylene precursor 1-aminocyclopropane-1-carboxylic acid (ACC) at 0.1 μM enhanced AR formation
when combined with IBA (10 μM), but reduced it when applied alone; this effect did not occur in the ein3eil1 ethyleneinsensitive
mutant. ACC inhibited the expression of the IAA-biosynthetic genes WEI2, WEI7, and YUC6, but enhanced
IBA-to-IAA conversion, as shown by the response of the ech2ibr10 mutant and an increase in the endogenous levels
of IAA. The ethylene effect was independent of auxin-signaling by TIR1-AFB2 and IBA-efflux by ABCG carriers, but it
was dependent on IAA-influx by AUX1/LAX3.
Taken together, the results demonstrate that a crosstalk involving ethylene signaling, IAA-influx, and IBA-to-IAA
conversion exists between ethylene and IAA in the control of AR formation.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
IAA-biosynthesis and transport; ethylene signaling; IBA-to-IAA conversion
Elenco autori:
A. Veloccia, L. Fattorini, F. Della Rovere, A. Sofo, S. D'Angeli, C. Betti, G. Falasca, M.M. Altamura
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