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Neovascularization during leafy gall formation on Arabidopsis thaliana upon Rhodococcus fascians infection

Main conclusion Extensive de novo vascularization of leafy galls emerging upon Rhodococcus fascians infection is achieved by fascicular/interfascicular cambium activity and transdifferentiation of parenchyma cells correlated with increased auxin signaling. A leafy gall consisting of fully developed... Full description

Journal Title: Planta 2017-09-23, Vol.247 (1), p.215-228
Main Author: Dolzblasz, Alicja
Other Authors: Banasiak, Alicja , Vereecke, Danny
Format: Electronic Article Electronic Article
Language: English
Subjects:
Publisher: Berlin/Heidelberg: Springer Berlin Heidelberg
ID: ISSN: 0032-0935
Link: https://www.ncbi.nlm.nih.gov/pubmed/28942496
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recordid: cdi_proquest_miscellaneous_1942698191
title: Neovascularization during leafy gall formation on Arabidopsis thaliana upon Rhodococcus fascians infection
format: Article
creator:
  • Dolzblasz, Alicja
  • Banasiak, Alicja
  • Vereecke, Danny
subjects:
  • Agriculture
  • Arabidopsis - cytology
  • Arabidopsis - growth & development
  • Arabidopsis - microbiology
  • Arabidopsis thaliana
  • Bacteria
  • Biomedical and Life Sciences
  • Callus
  • Cambium - cytology
  • Cambium - growth & development
  • Cambium - microbiology
  • Cell Transdifferentiation
  • Developmental biology
  • Ecology
  • Forestry
  • Gall
  • Galls
  • Genes, Reporter
  • Health aspects
  • Hyperplasia
  • Indoleacetic Acids - metabolism
  • Infections
  • Inflorescence - cytology
  • Inflorescence - growth & development
  • Inflorescence - microbiology
  • Life Sciences
  • Neovascularization
  • Original Article
  • Parenchyma
  • Plant Growth Regulators - metabolism
  • Plant Leaves - cytology
  • Plant Leaves - growth & development
  • Plant Leaves - microbiology
  • Plant Sciences
  • Plant Stems - cytology
  • Plant Stems - growth & development
  • Plant Stems - microbiology
  • Plant Tumors - microbiology
  • Rhodococcus
  • Rhodococcus - physiology
  • Shoots
  • Signal Transduction
  • Signaling
  • Vascularization
  • Xylem
  • Xylem - cytology
  • Xylem - growth & development
  • Xylem - microbiology
ispartof: Planta, 2017-09-23, Vol.247 (1), p.215-228
description: Main conclusion Extensive de novo vascularization of leafy galls emerging upon Rhodococcus fascians infection is achieved by fascicular/interfascicular cambium activity and transdifferentiation of parenchyma cells correlated with increased auxin signaling. A leafy gall consisting of fully developed yet growth-inhibited shoots, induced by the actinomycete Rhodococcus fascians , differs in structure compared to the callus-like galls induced by other bacteria. To get insight into the vascular development accompanying the emergence of the leafy gall, the anatomy of infected axillary regions of the inflorescence stem of wild-type Arabidopsis thaliana accession Col-0 plants and the auxin response in pDR5:GUS -tagged plants were followed in time. Based on our observations, three phases can be discerned during vascularization of the symptomatic tissue. First, existing fascicular cambium becomes activated and interfascicular cambium is formed giving rise to secondary vascular elements in a basipetal direction below the infection site in the main stem and in an acropetal direction in the entire side branch. Then, parenchyma cells in the region between both stems transdifferentiate acropetally towards the surface of the developing symptomatic tissue leading to the formation of xylem and vascularize the hyperplasia as they expand. Finally, parenchyma cells in the developing gall also transdifferentiate to vascular elements without any specific direction resulting in excessive vasculature disorderly distributed in the leafy gall. Prior to any apparent anatomical changes, a strong auxin response is mounted, implying that auxin is the signal that controls the vascular differentiation induced by the infection. To conclude, we propose the “sidetracking gall hypothesis” as we discuss the mechanisms driving the formation of superfluous vasculature of the emerging leafy gall.
language: eng
source:
identifier: ISSN: 0032-0935
fulltext: no_fulltext
issn:
  • 0032-0935
  • 1432-2048
url: Link


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titleNeovascularization during leafy gall formation on Arabidopsis thaliana upon Rhodococcus fascians infection
creatorDolzblasz, Alicja ; Banasiak, Alicja ; Vereecke, Danny
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descriptionMain conclusion Extensive de novo vascularization of leafy galls emerging upon Rhodococcus fascians infection is achieved by fascicular/interfascicular cambium activity and transdifferentiation of parenchyma cells correlated with increased auxin signaling. A leafy gall consisting of fully developed yet growth-inhibited shoots, induced by the actinomycete Rhodococcus fascians , differs in structure compared to the callus-like galls induced by other bacteria. To get insight into the vascular development accompanying the emergence of the leafy gall, the anatomy of infected axillary regions of the inflorescence stem of wild-type Arabidopsis thaliana accession Col-0 plants and the auxin response in pDR5:GUS -tagged plants were followed in time. Based on our observations, three phases can be discerned during vascularization of the symptomatic tissue. First, existing fascicular cambium becomes activated and interfascicular cambium is formed giving rise to secondary vascular elements in a basipetal direction below the infection site in the main stem and in an acropetal direction in the entire side branch. Then, parenchyma cells in the region between both stems transdifferentiate acropetally towards the surface of the developing symptomatic tissue leading to the formation of xylem and vascularize the hyperplasia as they expand. Finally, parenchyma cells in the developing gall also transdifferentiate to vascular elements without any specific direction resulting in excessive vasculature disorderly distributed in the leafy gall. Prior to any apparent anatomical changes, a strong auxin response is mounted, implying that auxin is the signal that controls the vascular differentiation induced by the infection. To conclude, we propose the “sidetracking gall hypothesis” as we discuss the mechanisms driving the formation of superfluous vasculature of the emerging leafy gall.
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descriptionMain conclusion Extensive de novo vascularization of leafy galls emerging upon Rhodococcus fascians infection is achieved by fascicular/interfascicular cambium activity and transdifferentiation of parenchyma cells correlated with increased auxin signaling. A leafy gall consisting of fully developed yet growth-inhibited shoots, induced by the actinomycete Rhodococcus fascians , differs in structure compared to the callus-like galls induced by other bacteria. To get insight into the vascular development accompanying the emergence of the leafy gall, the anatomy of infected axillary regions of the inflorescence stem of wild-type Arabidopsis thaliana accession Col-0 plants and the auxin response in pDR5:GUS -tagged plants were followed in time. Based on our observations, three phases can be discerned during vascularization of the symptomatic tissue. First, existing fascicular cambium becomes activated and interfascicular cambium is formed giving rise to secondary vascular elements in a basipetal direction below the infection site in the main stem and in an acropetal direction in the entire side branch. Then, parenchyma cells in the region between both stems transdifferentiate acropetally towards the surface of the developing symptomatic tissue leading to the formation of xylem and vascularize the hyperplasia as they expand. Finally, parenchyma cells in the developing gall also transdifferentiate to vascular elements without any specific direction resulting in excessive vasculature disorderly distributed in the leafy gall. Prior to any apparent anatomical changes, a strong auxin response is mounted, implying that auxin is the signal that controls the vascular differentiation induced by the infection. To conclude, we propose the “sidetracking gall hypothesis” as we discuss the mechanisms driving the formation of superfluous vasculature of the emerging leafy gall.
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1Arabidopsis - cytology
2Arabidopsis - growth & development
3Arabidopsis - microbiology
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5Bacteria
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9Cambium - growth & development
10Cambium - microbiology
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17Genes, Reporter
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20Indoleacetic Acids - metabolism
21Infections
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24Inflorescence - microbiology
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27Original Article
28Parenchyma
29Plant Growth Regulators - metabolism
30Plant Leaves - cytology
31Plant Leaves - growth & development
32Plant Leaves - microbiology
33Plant Sciences
34Plant Stems - cytology
35Plant Stems - growth & development
36Plant Stems - microbiology
37Plant Tumors - microbiology
38Rhodococcus
39Rhodococcus - physiology
40Shoots
41Signal Transduction
42Signaling
43Vascularization
44Xylem
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46Xylem - growth & development
47Xylem - microbiology
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40Shoots
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abstractMain conclusion Extensive de novo vascularization of leafy galls emerging upon Rhodococcus fascians infection is achieved by fascicular/interfascicular cambium activity and transdifferentiation of parenchyma cells correlated with increased auxin signaling. A leafy gall consisting of fully developed yet growth-inhibited shoots, induced by the actinomycete Rhodococcus fascians , differs in structure compared to the callus-like galls induced by other bacteria. To get insight into the vascular development accompanying the emergence of the leafy gall, the anatomy of infected axillary regions of the inflorescence stem of wild-type Arabidopsis thaliana accession Col-0 plants and the auxin response in pDR5:GUS -tagged plants were followed in time. Based on our observations, three phases can be discerned during vascularization of the symptomatic tissue. First, existing fascicular cambium becomes activated and interfascicular cambium is formed giving rise to secondary vascular elements in a basipetal direction below the infection site in the main stem and in an acropetal direction in the entire side branch. Then, parenchyma cells in the region between both stems transdifferentiate acropetally towards the surface of the developing symptomatic tissue leading to the formation of xylem and vascularize the hyperplasia as they expand. Finally, parenchyma cells in the developing gall also transdifferentiate to vascular elements without any specific direction resulting in excessive vasculature disorderly distributed in the leafy gall. Prior to any apparent anatomical changes, a strong auxin response is mounted, implying that auxin is the signal that controls the vascular differentiation induced by the infection. To conclude, we propose the “sidetracking gall hypothesis” as we discuss the mechanisms driving the formation of superfluous vasculature of the emerging leafy gall.
copBerlin/Heidelberg
pubSpringer Berlin Heidelberg
pmid28942496
doi10.1007/s00425-017-2778-5