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Plant Cell, Vol. 12, 771-786, May 2000, Copyright © 2000, American Society of Plant Physiologists

Pti4 Is Induced by Ethylene and Salicylic Acid, and Its Product Is Phosphorylated by the Pto Kinase

Yong-Qiang Gua, Caimei Yanga, Venkatappa K. Tharab, Jianmin Zhoub, and Gregory B. Martina,c
a Boyce Thompson Institute for Plant Research, Ithaca, New York 14853-1801
b Department of Plant Pathology, Kansas State University, Manhattan, Kansas 66506
c Department of Plant Pathology, Cornell University, Ithaca, New York 14853

Correspondence to: Gregory B. Martin, at the Boyce Thompson Institute., gbm7{at}cornell.edu (E-mail), 607-255-6695 (fax)

The tomato Pti4 gene encodes a transcription factor that was identified on the basis of its specific interaction with the product of the Pto disease resistance gene in a yeast two-hybrid system. We show here that the Pti4 protein specifically binds the GCC-box cis element, which is present in the promoter region of many pathogenesis-related (PR) genes. Expression of the Pti4 gene in tomato leaves was rapidly induced by ethylene and by infection with Pseudomonas syringae pv tomato, and this induction preceded expression of GCC-box-containing PR genes. Although salicylic acid also induced Pti4 gene expression, it did not induce GCC-box PR genes. Rather, salicylic acid antagonized ethylene-mediated expression of GCC-box PR genes. We demonstrate that the Pti4 protein is specifically phosphorylated by the Pto kinase and that this phosphorylation enhances binding of Pti4 to the GCC box. In addition, induced overexpression of Pto and Pti4 in tomato leaves resulted in a concomitant increase in GCC-box PR genes. Our results support a model in which phosphorylation of the Pti4 protein by the Pto kinase enhances the ability of Pti4 to activate expression of GCC-box PR genes in tomato.




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