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Characterization of HbEREBP1, a wound-responsive transcription factor gene in laticifers of Hevea brasiliensis Muell. Arg.

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Abstract

AP2/ERF transcription factors play an important role in regulation of the cross-talk between ethylene and jasmonate signaling pathways mediating defense responses of plants to biotic and abiotic stresses. In this study, an AP2/ERF transcription factor gene was isolated and characterized from laticifers of rubber tree by using RACE and real time PCR. The full length cDNA, referred to as HbEREBP1, was 1,095 bp in length and contained a 732 bp open reading frame encoding a putative protein of 243 amino acid residues. The molecular mass of the putative protein is 26.4 kDa with a pI of 9.46. The deduced amino acid sequence had a specific domain of AP2 superfamily and an ethylene-responsive element binding factor-associated amphiphilic repression motif, sharing 42.4, 39.1, and 38.0% identity with that of AtERF11, AtERF4, and AtERF8 in Arabidopsis, respectively. HbEREBP1 expression was down-regulated by tapping and mechanical wounding in the laticifers of adult trees. It was also down-regulated at early stage while up-regulated at late stage upon treatment with exogenous ethephon or methyl jasmonate, which was reverse to the case of defense genes in laticifers of epicormic shoots of rubber tree. Our results suggest that HbEREBP1 may be a negative regulator of defense genes in laticifers.

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Acknowledgments

This work was supported by the earmarked fund for China Agriculture Research System (CARS-34-GW1) and Chinese National Nonprofit Institute Research Grant of CATAS-RRI (XJSYWFZX2009-09), and equally contributed by the Rubber Research Institute, CATAS and Hainan University.

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Correspondence to Wei-Min Tian.

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11033_2011_1146_MOESM1_ESM.jpg

Fig. S1 Sequence alignment of the deduced HbEREBP1 protein and other ERF proteins. The HbEREBP1 (GenBank accession No.: HQ171930) was from Hevea brasiliensis while AtERF3 (GenBank accession No.: GI7531109), AtERF4 (GenBank accession No.: GI7531110), AtERF11 (GenBank accession No.:GI57012863) were from Arabidopsis, and NsERF3 (GenBank accession No.: GI57012875) was from Nicotiana sylvestris. The identical amino acids were shaded in dark and the well-conserved residues were shaded in gray. The conserved domain and motif was underlined. Supplementary material 1 (JPEG 352 kb)

11033_2011_1146_MOESM2_ESM.jpg

Fig. S2 Phylogenetic tree of HbEREBP1 from rubber tree and ERF-like members from Arabidopsis with indicated GenBank accession numbers. The gene names instead of GenBank accession numbers were given for the members of B1a subgroup. Supplementary material 2 (JPEG 56 kb)

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Chen, YY., Wang, LF., Dai, LJ. et al. Characterization of HbEREBP1, a wound-responsive transcription factor gene in laticifers of Hevea brasiliensis Muell. Arg.. Mol Biol Rep 39, 3713–3719 (2012). https://doi.org/10.1007/s11033-011-1146-y

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