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Plant Physiol, December 2002, Vol. 130, pp. 1983-1991

Effect of Ethylene Pathway Mutations upon Expression of the Ethylene Receptor ETR1 from Arabidopsis1

Xue-Chu Zhao,2 Xiang Qu,2 Dennis E. Mathews, and G. Eric Schaller*

Departments of Biochemistry and Molecular Biology (X.-C.Z., X.Q., G.E.S.) and Plant Biology (D.E.M.), University of New Hampshire, Durham, New Hampshire 03824

The ethylene receptor family of Arabidopsis consists of five members, one of these being ETR1. The effect of ethylene pathway mutations upon expression of ETR1 was examined. For this purpose, ETR1 levels were quantified in mutant backgrounds containing receptor loss-of-function mutations, ethylene-insensitive mutations, and constitutive ethylene response mutations. Ethylene-insensitive mutations of ETR1 resulted in a posttranscriptional increase in levels of the mutant receptor. Treatment of seedlings with silver, which leads to ethylene insensitivity, also resulted in an increase in levels of ETR1. Loss-of-function mutations of ETR1 resulted in both transcriptional and posttranscriptional changes in levels of the receptor. Most other ethylene pathway mutations, including a newly isolated T-DNA insertion mutation in the gene encoding the ethylene receptor ERS1, had relatively minor effects upon the expression of ETR1. Our results indicate that mutations in ETR1 can affect expression at the posttranscriptional level, and suggest that these posttranscriptional changes may contribute to the phenotypes observed in the mutants. Our results also refine the model on how mutations in ethylene receptors are able to confer dominant ethylene insensitivity upon plants.

1 This work was supported by the National Science Foundation (grant nos. MCB-9982510 and DBI-9975908 to G.E.S.). This is scientific contribution no. 2,138 from the New Hampshire Agricultural Experiment Station.

2 These authors contributed equally to the paper.

* Corresponding author; e-mail egs{at}cisunix.unh.edu; fax 603- 862-4013.

© 2002 American Society of Plant Biologists


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