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Plant-derived auxin plays an accessory role in symptom development upon Rhodococcus fascians infection

(2012) PLANT JOURNAL. 70(3). p.513-527
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Abstract
The biotrophic phytopathogen Rhodococcus fascians has a profound impact on plant development, mainly through its principal virulence factors, a mix of synergistically acting cytokinins that induce shoot formation. Expression profiling of marker genes for several auxin biosynthesis routes and mutant analysis demonstrated that the bacterial cytokinins stimulate the auxin biosynthesis of plants via specific targeting of the indole-3-pyruvic acid (IPA) pathway, resulting in enhanced auxin signaling in infected tissues. The double mutant tryptophan aminotransferase 1-1 tryptophan aminotransferase related 2-1 (taa1-1 tar2-1) of Arabidopsis (Arabidopsis thaliana), in which the IPA pathway is defective, displayed a decreased responsiveness towards R.similar to fascians infection, although bacterial colonization and virulence gene expression were not impaired. These observations implied that plant-derived auxin was employed to reinforce symptom formation. Furthermore, the increased auxin production and, possibly, the accumulating bacterial cytokinins in infected plants modified the polar auxin transport so that new auxin maxima were repetitively established and distributed, a process that is imperative for symptom onset and maintenance. Based on these findings, we extend our model of the mode of action of bacterial and plant signals during the interaction between R.similar to fascians and Arabidopsis.
Keywords
BIOSYNTHESIS, BACTERIAL, ROOT INITIATION, MEDICAGO-TRUNCATULA, SIGNAL INTEGRATION, gall formation, polar auxin transport, TAA1, Arabidopsis thaliana, Rhodococcus fascians, HORMONE, CYTOKININS, MUTANTS, EFFLUX, ARABIDOPSIS-THALIANA

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Chicago
Stes, Elisabeth, Els Prinsen, Marcella Holsters, and Danny Vereecke. 2012. “Plant-derived Auxin Plays an Accessory Role in Symptom Development Upon Rhodococcus Fascians Infection.” Plant Journal 70 (3): 513–527.
APA
Stes, E., Prinsen, E., Holsters, M., & Vereecke, D. (2012). Plant-derived auxin plays an accessory role in symptom development upon Rhodococcus fascians infection. PLANT JOURNAL, 70(3), 513–527.
Vancouver
1.
Stes E, Prinsen E, Holsters M, Vereecke D. Plant-derived auxin plays an accessory role in symptom development upon Rhodococcus fascians infection. PLANT JOURNAL. 2012;70(3):513–27.
MLA
Stes, Elisabeth, Els Prinsen, Marcella Holsters, et al. “Plant-derived Auxin Plays an Accessory Role in Symptom Development Upon Rhodococcus Fascians Infection.” PLANT JOURNAL 70.3 (2012): 513–527. Print.
@article{2965496,
  abstract     = {The biotrophic phytopathogen Rhodococcus fascians has a profound impact on plant development, mainly through its principal virulence factors, a mix of synergistically acting cytokinins that induce shoot formation. Expression profiling of marker genes for several auxin biosynthesis routes and mutant analysis demonstrated that the bacterial cytokinins stimulate the auxin biosynthesis of plants via specific targeting of the indole-3-pyruvic acid (IPA) pathway, resulting in enhanced auxin signaling in infected tissues. The double mutant tryptophan aminotransferase 1-1 tryptophan aminotransferase related 2-1 (taa1-1 tar2-1) of Arabidopsis (Arabidopsis thaliana), in which the IPA pathway is defective, displayed a decreased responsiveness towards R.similar to fascians infection, although bacterial colonization and virulence gene expression were not impaired. These observations implied that plant-derived auxin was employed to reinforce symptom formation. Furthermore, the increased auxin production and, possibly, the accumulating bacterial cytokinins in infected plants modified the polar auxin transport so that new auxin maxima were repetitively established and distributed, a process that is imperative for symptom onset and maintenance. Based on these findings, we extend our model of the mode of action of bacterial and plant signals during the interaction between R.similar to fascians and Arabidopsis.},
  author       = {Stes, Elisabeth and Prinsen, Els and Holsters, Marcella and Vereecke, Danny},
  issn         = {0960-7412},
  journal      = {PLANT JOURNAL},
  keyword      = {BIOSYNTHESIS,BACTERIAL,ROOT INITIATION,MEDICAGO-TRUNCATULA,SIGNAL INTEGRATION,gall formation,polar auxin transport,TAA1,Arabidopsis thaliana,Rhodococcus fascians,HORMONE,CYTOKININS,MUTANTS,EFFLUX,ARABIDOPSIS-THALIANA},
  language     = {eng},
  number       = {3},
  pages        = {513--527},
  title        = {Plant-derived auxin plays an accessory role in symptom development upon Rhodococcus fascians infection},
  url          = {http://dx.doi.org/10.1111/j.1365-313X.2011.04890.x},
  volume       = {70},
  year         = {2012},
}

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