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Journal of Experimental Botany 2007 58(13):3743-3748; doi:10.1093/jxb/erm224
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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

MdERFs, two ethylene-response factors involved in apple fruit ripening

Aide Wang1, Dongmei Tan2, Ayako Takahashi1,*, Tian Zhong Li3 and Takeo Harada1 {dagger}

1Laboratory of Plant Breeding and Genetics, Faculty of Agriculture and Life Science, Hirosaki University, Hirosaki 036-8561, Japan
2Department of Agriculture and Engineering, Weifang University, Weifang 261061, China
3College of Agronomy and Bio-tech., China Agricultural University, Beijing 100094, China

{dagger} To whom correspondence should be addressed. E-mail: tharada{at}cc.hirosaki-u.ac.jp

Two MdERFs (ethylene-response factors) were isolated from ripening apple (Malusxdomestica Borkh. cv. Golden Delicious) fruit. The features of their conserved motifs indicated that MdERF1 and MdERF2 belong to group VII and group IX categories in Arabidopsis, respectively. MdERF1 was expressed predominantly in ripening fruit, although a small degree of expression was also observed in non-fruit tissues, whereas MdERF2 was expressed exclusively in ripening fruit. The increased expression in ripening fruit was repressed by treatment with 1-methylcyclopropene (1-MCP: a potent antagonist of ethylene receptors), indicating that transcription is regulated positively by the ethylene signalling system. Indeed, it was a tendency for cultivars with low ethylene production to show lower MdERFs expression than those with high ethylene production. On the basis of concomitant analyses of the expression of some genes related to ripening, the functions of MdERFs and the role of ethylene in the ripening process are discussed.

Key words: Apple fruit, ERF, ethylene, ripening

* Present address: Kuji Agricultural Information Center, Kuji 028-8042, Japan.

Received 23 June 2007; Revised 9 August 2007 Accepted 28 August 2007


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