4.7 Article

Ectopic expression of rice Xa21 overcomes developmentally controlled resistance to Xanthomonas oryzae pv. oryzae

Journal

PLANT SCIENCE
Volume 179, Issue 5, Pages 466-471

Publisher

ELSEVIER IRELAND LTD
DOI: 10.1016/j.plantsci.2010.07.008

Keywords

Oryza sativa; Pathogen-associated molecular pattern; Pattern recognition receptor; XA21; Xanthomonas oryzae pv. oryzae

Funding

  1. National Institutes of Health [GM055962]
  2. U.S. Department of Agriculture (USDA) [2004-35317148]
  3. Korean Ministry of Education, Science and Technology [R33-2008-000-10168-0]
  4. Direct For Biological Sciences [943352] Funding Source: National Science Foundation
  5. Division Of Integrative Organismal Systems [943352] Funding Source: National Science Foundation
  6. Ministry of Education, Science & Technology (MoST), Republic of Korea [R33-2008-000-10168-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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Recognition of pathogen-associated molecular patterns (PAMPs) by pattern recognition receptors (PRRs) activates the innate immune response. The rice PRR. XA21, confers robust resistance at adult stages to most strains of the bacterial pathogen Xanthomonas oryzae pv. oryzae (Xoo). Seedlings are still easily infected by Xoo, causing severe yield losses. Here we report that Xa21 is induced by Xoo infection and that ectopic expression of Xa21 confers resistance at three leaf stage (three-week old), overcoming the developmental limitation of XA21-mediated resistance. Ectopic expression of Xa21 also up-regulates a larger set of defence-related genes as compared to Xa21 driven by the native promoter. These results indicate that altered regulation of Xa21 expression is useful for developing enhanced resistance to Xoo at multiple developmental stages. Published by Elsevier Ireland Ltd.

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