Plant Cell Journal of Pharmacology and Experimental Therapeutics
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Plant Cell, Vol. 13, 437-447, February 2001, Copyright © 2001, American Society of Plant Physiologists

Arabidopsis NHO1 Is Required for General Resistance against Pseudomonas Bacteria

Ming Lua, Xiaoyan Tanga, and Jian-Min Zhoua
a Department of Plant Pathology, Kansas State University, Manhattan, Kansas 66506

Correspondence to: Jian-Min Zhou, jzhou{at}plantpath.ksu.edu (E-mail), 785-532-5692 (fax)

Nonhost interactions are prevalent between plants and specialized phytopathogens. Although it has great potential for providing crop plants with durable resistance, nonhost resistance is poorly understood. Here, we show that nonhost resistance is controlled, at least in part, by general resistance. Arabidopsis plants are resistant to the nonhost pathogen Pseudomonas syringae pv phaseolicola NPS3121 and completely arrest bacterial multiplication in the plant. Ten Arabidopsis mutants were isolated that were compromised in nonhost (nho) resistance to P. s. phaseolicola. Among these, nho1 is caused by a single recessive mutation that defines a novel gene. nho1 is defective in nonspecific resistance to Pseudomonas bacteria, because it also supported the growth of P. s. tabaci and P. fluorescens bacteria, both of which are nonpathogenic on Arabidopsis. In addition, the nho1 mutation also compromised resistance mediated by RPS2, RPS4, RPS5, and RPM1. Interestingly, the nho1 mutation had no effect on the growth of the virulent bacteria P. s. maculicola ES4326 and P. s. tomato DC3000, but it partially restored the in planta growth of the DC3000 hrpS- mutant bacteria. Thus, the virulent bacteria appear to evade or suppress NHO1-mediated resistance by means of an Hrp-dependent virulence mechanism.




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