© 2007 The Author(s).
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RESEARCH PAPER |
Isolation and characterization of four ethylene signal transduction elements in plums (Prunus salicina L.)
1University of Guelph, Department of Plant Agriculture, 4890 Victoria Ave. N., PO Box 7000, Vineland Station, ON L0R 2E0, Canada
2Agriculture and Agri-Food Canada, Southern Crop Protection and Food Research Centre, 4902 Victoria Ave. N., PO Box 6000, Vineland Station, ON L0R 2E0, Canada
3Agriculture and Agri-Food Canada, Southern Crop Protection and Food Research Centre, 1391 Sandford St, London, ON N5V 4T3, Canada
* To whom correspondence should be addressed. E-mail: jsubrama{at}uoguelph.ca
Plums are climacteric fruits: their ripening is associated with a burst of ethylene production and respiration rate. Stone fruits, including plum, have a distinct pattern of growth and development, described as a double sigmoid pattern. In order to understand the developmental control of ethylene perception in plum, four ethylene perception and signal transduction components (EPSTCs) were characterized, including two ETR1-like proteins (Ps-ETR1 and Ps-ERS1), a CTR1-like protein, and an ethylene-responsive element-binding factor (ERF). Their regulation was studied throughout fruit development and ripening in early and late cultivars. Analysis of transcript levels revealed that only Ps-ERF1 and Ps-ERS1 accumulated immediately after fertilization. Increases in Ps-ETR1 and Ps-CTR1 transcript levels could not be detected before S3 of fruit development. Marked differences associated with the ripening behaviour of early (‘Early Golden’) and late (‘Shiro’) Japanese plum cultivars were observed. The early cultivar showed ripening patterns typical of climacteric fruits accompanied by sharp increases of the four transcript levels in an ethylene-dependent manner. However, the late cultivar exhibited a suppressed-climacteric pattern, with a slight increase in ethylene production related to ripening. The accumulation of the Ps-ETR1 (and not Ps-CTR1) mRNA in the late cultivar was ethylene independent. Ps-ERS1 mRNA was expressed at low, constant levels, while, Ps-ERF1 remained undetectable. The differences between the two plum cultivars in the date and rate of ripening in relation to the differences in the accumulation patterns of the four mRNAs are discussed.
Key words: Double sigmoid curve, ethylene perception, fruit development and ripening, gene expression, 1-MCP
Received 19 June 2007; Revised 13 August 2007 Accepted 14 August 2007
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