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First published online April 4, 2002; 10.1105/tpc.000794

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The Plant Cell, Vol. 14, 817-831, April 2002, Copyright © 2002,
American Society of Plant Biologists

Tomato Transcription Factors Pti4, Pti5, and Pti6 Activate Defense Responses When Expressed in Arabidopsis

Yong-Qiang Gu1,a, Mary C. Wildermuthb,c, Suma Chakravarthya, Ying-Tsu Lohd, Caimei Yanga, Xiaohua Hea, Yu Hana and Gregory B. Martin2,a,e

a Boyce Thompson Institute for Plant Research, Ithaca, New York 14853
b Department of Genetics, Harvard Medical School, Boston, Massachusetts 02115
c Department of Molecular Biology, Massachusetts General Hospital, Boston, Massachusetts 02114
d Department of Agronomy, Purdue University, West Lafayette, Indiana 47907
e Department of Plant Pathology, Cornell University, Ithaca, New York 14853

1 Current address: USDA-ARS, WRRC, Albany, CA 94710

The Pti4, Pti5, and Pti6 proteins from tomato were identified based on their interaction with the product of the Pto disease resistance gene, a Ser-Thr protein kinase. They belong to the ethylene-response factor (ERF) family of plant-unique transcription factors and bind specifically to the GCC-box cis element present in the promoters of many pathogenesis-related (PR) genes. Here, we show that these tomato ERFs are localized to the nucleus and function in vivo as transcription activators that regulate the expression of GCC box–containing PR genes. Expression of Pti4, Pti5, or Pti6 in Arabidopsis activated the expression of the salicylic acid–regulated genes PR1 and PR2. Expression of jasmonic acid– and ethylene-regulated genes, such as PR3, PR4, PDF1.2, and Thi2.1, was affected differently by each of the three tomato ERFs, with Arabidopsis-Pti4 plants having very high levels of PDF1.2 transcripts. Exogenous application of salicylic acid to Arabidopsis-Pti4 plants suppressed the increased expression of PDF1.2 but further stimulated PR1 expression. Arabidopsis plants expressing Pti4 displayed increased resistance to the fungal pathogen Erysiphe orontii and increased tolerance to the bacterial pathogen Pseudomonas syringae pv tomato. These results indicate that Pti4, Pti5, and Pti6 activate the expression of a wide array of PR genes and play important and distinct roles in plant defense.




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