אסיף מאגר המחקר החקלאי

Strigolactones interact with ethylene and auxin in regulating root-hair elongation in Arabidopsis

Year:

2011

Source of publication :

Authors :

Volume :

62

Co-Authors:

Kapulnik, Y., Institute of Plant Sciences, Agricultural Research Organization (ARO), Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Resnick, N., Institute of Plant Sciences, Agricultural Research Organization (ARO), Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Mayzlish-Gati, E., Institute of Plant Sciences, Agricultural Research Organization (ARO), Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Kaplan, Y., Institute of Plant Sciences, Agricultural Research Organization (ARO), Volcani Center, PO Box 6, Bet Dagan 50250, Israel, Department of Phytopathology and Weed Research, Newe-ya'Ar Research Center, PO Box 1021, Ramat-Yishay, Israel
Wininger, S., Institute of Plant Sciences, Agricultural Research Organization (ARO), Volcani Center, PO Box 6, Bet Dagan 50250, Israel
Hershenhorn, J., Department of Phytopathology and Weed Research, Newe-ya'Ar Research Center, PO Box 1021, Ramat-Yishay, Israel
Koltai, H., Institute of Plant Sciences, Agricultural Research Organization (ARO), Volcani Center, PO Box 6, Bet Dagan 50250, Israel

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Abstract:

Strigolactones (SLs) or derivatives thereof have been identified as phytohormones, and shown to act as long-distance shoot-branching inhibitors. In Arabidopsis roots, SLs have been suggested to have a positive effect on root-hair (RH) elongation, mediated via the MAX2 F-box. Two other phytohormones, auxin and ethylene, have been shown to have positive effects on RH elongation. Hence, in the present work, Arabidopsis RH elongation was used as a bioassay to determine epistatic relations between SLs, auxin, and ethylene. Analysis of the effect of hormonal treatments on RH elongation in the wild type and hormone-signalling mutants suggested that SLs and ethylene regulate RH elongation via a common regulatory pathway, in which ethylene is epistatic to SLs, whereas the effect of SLs on RH elongation requires ethylene synthesis. SL signalling was not needed for the auxin response, whereas auxin signalling was not necessary, but enhanced RH response to SLs, suggesting that the SL and auxin hormonal pathways converge for regulation of RH elongation. The ethylene pathway requirement for the RH response to SLs suggests that ethylene forms a cross-talk junction between the SL and auxin pathways. © 2011 The Author(s).

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