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Published on July 16, 2008; 10.1104/pp.108.118869

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Received March 9, 2008
Accepted June 22, 2008

eIF5A is involved in pathogen-induced cell death and development of disease symptoms in Arabidopsis thaliana

Marianne T. Hopkins , Yulia Lampi , Tzann-Wei Wang , Zhongda Liu , and John E. Thompson *

Department of Biology, University of Waterloo, Waterloo, ON, N2L 3G1 Canada

* Corresponding author; email: jet{at}uwaterloo.ca.

Eukaryotic translation initiation factor 5A (eIF5A) is a highly conserved protein found in all eukaryotic kingdoms. The present study demonstrates that plant eIF5A is involved in the development of disease symptoms induced by a common necrotrophic bacterial phytopathogen. Specifically, AteIF5A-2, one of the three eIF5A genes in Arabidopsis thaliana, is shown to regulate programmed cell death caused by infection with virulent Pseudomonas syringae pv tomato DC3000 (Pst DC3000). Transgenic Arabidopsis plants with constitutively suppressed AteIF5A-2 exhibited marked resistance to programmed cell death induced by virulent Pst DC3000, and there was a corresponding reduction in pathogen growth and development of disease symptoms in the plant tissue. Constitutive over-expression of AteIF5A-2 circumvented the apparent post-transcriptional regulation of AteIF5A-2 protein expression characteristic of wild-type plants, but did not increase susceptibility to virulent Pst DC3000 ingression. The transgenic plants with constitutive AteIF5A-2 over-expression did, however, display phenotypes consistent with precocious cell death. The results indicate that AteIF5A-2 is a key element of the signal transduction pathway resulting in plant programmed cell death.






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