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JXB Advance Access originally published online on January 8, 2007
Journal of Experimental Botany 2007 58(3):673-686; doi:10.1093/jxb/erl242
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© The Author [2007]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

RESEARCH PAPER

Members of the ethylene signalling pathway are regulated in sugarcane during the association with nitrogen-fixing endophytic bacteria

JJV Cavalcante1,2 *, C Vargas1,2 *, EM Nogueira1,2, F Vinagre1,2, K Schwarcz1,2, JI Baldani3, PCG Ferreira1,2 and AS Hemerly1,2,{dagger}

1Instituto de Bioquímica Médica, UFRJ, 21941-590, Rio de Janeiro, RJ, Brazil
2Laboratório de Biologia Molecular de Plantas, Instituto de Pesquisas, do Jardim Botânico do Rio de Janeiro, Rua Pacheco Leão 915, 22460-030, Rio de Janeiro, RJ, Brazil
3CNPAB/EMBRAPA, BR465, Km47 23851-970, Seropédica, RJ, Brazil

{dagger} To whom correspondence should be addressed. E-mail: hemerly{at}bioqmed.ufrj.br or hemerly{at}cshl.edu

Nitrogen-fixing bacteria have been isolated from sugarcane in an endophytic and beneficial interaction that promotes plant growth. In this work, for the first time, the involvement of ethylene signalling in this interaction was investigated by molecular characterizing members of this pathway in sugarcane. The expression pattern of a putative ethylene receptor (SCER1) and two putative ERF transcription factors (SCERF1 and SCERF2) show exclusive modulation in plants inoculated with the diazotrophic endophytes. The gene expression profile of SCER1, SCERF1, and SCERF2 is differentially regulated in sugarcane genotypes that can establish efficient or inefficient associations with diazotrophic micro-organisms, exhibiting high or low biological nitrogen fixation (BNF) rates, respectively. In addition, SCER1, SCERF1, and SCERF2 expression is different in response to interactions with pathogenic and beneficial micro-organisms. Taken together, that data suggest that SCER1, SCERF1, and SCERF2 might participate in specific ethylene signalling cascade(s) that can identify a beneficial endophytic association, modulating sugarcane responses toward the diazotrophic endophytes.

Key words: Biological nitrogen fixation, diazotrophic endophytes, ERF, ethylene-responsive factor, ethylene signalling, plant–microbe interaction, receptor, sugarcane

* These authors contributed equally to this work.

Received 31 March 2006; Revised 18 October 2006 Accepted 24 October 2006


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