Modulation of the hormone setting by Rhodococcus fascians results in ectopic KNOX activation in Arabidopsis

Plant Physiology
Stephen DepuydtD Vereecke

Abstract

The biotrophic actinomycete Rhodococcus fascians has a profound impact on plant development and a common aspect of the symptomatology is the deformation of infected leaves. In Arabidopsis (Arabidopsis thaliana), the serrated leaf margins formed upon infection resemble the leaf phenotype of transgenic plants with ectopic expression of KNOTTED-like homeobox (KNOX) genes. Through transcript profiling, we demonstrate that class-I KNOX genes are transcribed in symptomatic leaves. Functional analysis revealed that BREVIPEDICELLUS/KNOTTED-LIKE1 and mainly SHOOT MERISTEMLESS were essential for the observed leaf dissection. However, these results also positioned the KNOX genes downstream in the signaling cascade triggered by R. fascians infection. The much faster activation of ARABIDOPSIS RESPONSE REGULATOR5 and the establishment of homeostatic and feedback mechanisms to control cytokinin (CK) levels support the overrepresentation of this hormone in infected plants due to the secretion by the pathogen, thereby placing the CK response high up in the cascade. Hormone measurements show a net decrease of tested CKs, indicating either that secretion by the bacterium and degradation by the plant are in balance, or, as suggested by the strong ...Continue Reading

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Citations

Dec 17, 2008·Plant Molecular Biology·Rajendra Bari, Jonathan D G Jones
Jan 9, 2009·Proceedings of the National Academy of Sciences of the United States of America·Ine PertryDanny Vereecke
May 12, 2010·Journal of Experimental Botany·Naoyuki Uchida, Masao Tasaka
Apr 10, 2012·Molecular Plant-microbe Interactions : MPMI·Isolde FrancisDanny Vereecke
Jan 2, 2009·Plant Physiology·Stephen DepuydtDanny Vereecke
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Feb 3, 2009·Plant, Cell & Environment·Cristiana T ArguesoJoseph J Kieber
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Jul 3, 2015·Journal of Experimental Botany·Elisabeth StesDanny Vereecke
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Aug 7, 2010·Molecular Plant-microbe Interactions : MPMI·Ine PertryDanny Vereecke
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Mar 20, 2020·Planta·Irina E DoduevaLudmila L Lutova
Aug 27, 2021·Biological Reviews of the Cambridge Philosophical Society·Vladimir Gorshkov, Ivan Tsers

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