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Pathogen Effectors, Plasmodesmata, and Novel Vesicular Structures in Plant Immunity
Pathogen Effectors, Plasmodesmata, and Novel Vesicular Structures in Plant Immunity
Pathogen Effectors, Plasmodesmata, and Novel Vesicular Structures in Plant Immunity

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20260202102938
ISBN  
9798286432554
DDC  
580
저자명  
Variz, Haris.
서명/저자  
Pathogen Effectors, Plasmodesmata, and Novel Vesicular Structures in Plant Immunity
발행사항  
[Sl] : Iowa State University, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
201 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-12, Section: B.
주기사항  
Advisor: Aung, Kyaw.
학위논문주기  
Thesis (Ph.D.)--Iowa State University, 2025.
초록/해제  
요약Plasmodesmata (PD) are essential intercellular structures that facilitate the movement of signaling molecules, enabling coordinated growth, development, and immune responses in plants. My dissertation explores novel functional aspects of PD and their modulation by host and microbial factors. I demonstrate that multiple bacterial effectors from Pseudomonas syringae pv. tomato DC3000 are capable of trafficking cell-to-cell through PD in Nicotiana benthamiana. This movement is dependent on the size of the effector. It can also be restricted by PD closure, either through overexpression of PD-LOCATED PROTEIN 5 (PDLP5) or treatment with the pathogen-associated molecular pattern flg22, revealing a PD-dependent pathway exploited by bacterial virulence factors. I further characterize an atypical receptor-like kinase, STRUBBELIG RECEPTOR FAMILY 3 (SRF3), initially identified as a putative functional partner of PDLP5. My findings show that SRF3 resides in the same protein complex as PDLP5 and localizes to PD. Additionally, SRF3 is detected in a newly identified vesicular structure, termed PD Bubbles. These vesicles form under osmotic and cell wall stress conditions, encapsulate extracellular reactive oxygen species (ROS), and are significantly reduced in srf3 mutants, suggesting a role for SRF3 in vesicle biogenesis at the PD-plasma membrane interface. Loss of SRF3 disrupts ROS homeostasis and increases susceptibility to avirulent bacterial infection, implicating SRF3 as a key component in immune regulation. Collaborating with the Whitham lab, I investigate Phakopsora pachyrhizi effector candidate 15 (PpEC15), a conserved aspartic protease. Using confocal microscopy, I demonstrated that PpEC15 localizes to the nucleus and physically interacts with two nuclear-localized soybean proteins: the transcription factor GmNAC83 and the peptide chain release factor GmPCRF. Collectively, this work expands our understanding of plasmodesmata as dynamic regulatory hubs in plant immunity, identifies a novel vesicular structure associated with PD, and highlights the complexity of host-pathogen interactions.
일반주제명  
Plant sciences
일반주제명  
Pathology
일반주제명  
Molecular biology
일반주제명  
Immunology
키워드  
Bacterial effectors
키워드  
Novel plasmodesmata vesicles
키워드  
Plasmodesmata
키워드  
Reactive oxygen species
키워드  
Plant immunity
기타저자  
Iowa State University Genetics Development and Cell Biology
기본자료저록  
Dissertations Abstracts International. 86-12B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■035    ▼a(MiAaPQ)AAI30570404
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a580
■1001  ▼aVariz,  Haris.▼0(orcid)0009-0004-0907-6797
■24510▼aPathogen  Effectors,  Plasmodesmata,  and  Novel  Vesicular  Structures  in  Plant  Immunity
■260    ▼a[Sl]▼bIowa  State  University▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a201  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-12,  Section:  B.
■500    ▼aAdvisor:  Aung,  Kyaw.
■5021  ▼aThesis  (Ph.D.)--Iowa  State  University,  2025.
■520    ▼aPlasmodesmata  (PD)  are  essential  intercellular  structures  that  facilitate  the  movement  of  signaling  molecules,  enabling  coordinated  growth,  development,  and  immune  responses  in  plants.  My  dissertation  explores  novel  functional  aspects  of  PD  and  their  modulation  by  host  and  microbial  factors.  I  demonstrate  that  multiple  bacterial  effectors  from  Pseudomonas  syringae  pv.  tomato  DC3000  are  capable  of  trafficking  cell-to-cell  through  PD  in  Nicotiana  benthamiana.  This  movement  is  dependent  on  the  size  of  the  effector.  It  can  also  be  restricted  by  PD  closure,  either  through  overexpression  of  PD-LOCATED  PROTEIN  5  (PDLP5)  or  treatment  with  the  pathogen-associated  molecular  pattern  flg22,  revealing  a  PD-dependent  pathway  exploited  by  bacterial  virulence  factors.  I  further  characterize  an  atypical  receptor-like  kinase,  STRUBBELIG  RECEPTOR  FAMILY  3  (SRF3),  initially  identified  as  a  putative  functional  partner  of  PDLP5.  My  findings  show  that  SRF3  resides  in  the  same  protein  complex  as  PDLP5  and  localizes  to  PD.  Additionally,  SRF3  is  detected  in  a  newly  identified  vesicular  structure,  termed  PD  Bubbles.  These  vesicles  form  under  osmotic  and  cell  wall  stress  conditions,  encapsulate  extracellular  reactive  oxygen  species  (ROS),  and  are  significantly  reduced  in  srf3  mutants,  suggesting  a  role  for  SRF3  in  vesicle  biogenesis  at  the  PD-plasma  membrane  interface.  Loss  of  SRF3  disrupts  ROS  homeostasis  and  increases  susceptibility  to  avirulent  bacterial  infection,  implicating  SRF3  as  a  key  component  in  immune  regulation.  Collaborating  with  the  Whitham  lab,  I  investigate  Phakopsora  pachyrhizi  effector  candidate  15  (PpEC15),  a  conserved  aspartic  protease.  Using  confocal  microscopy,  I  demonstrated  that  PpEC15  localizes  to  the  nucleus  and  physically  interacts  with  two  nuclear-localized  soybean  proteins:  the  transcription  factor  GmNAC83  and  the  peptide  chain  release  factor  GmPCRF.  Collectively,  this  work  expands  our  understanding  of  plasmodesmata  as  dynamic  regulatory  hubs  in  plant  immunity,  identifies  a  novel  vesicular  structure  associated  with  PD,  and  highlights  the  complexity  of  host-pathogen  interactions.
■590    ▼aSchool  code:  0097.
■650  4▼aPlant  sciences
■650  4▼aPathology
■650  4▼aMolecular  biology
■650  4▼aImmunology
■653    ▼aBacterial  effectors
■653    ▼aNovel  plasmodesmata  vesicles
■653    ▼aPlasmodesmata
■653    ▼aReactive  oxygen  species
■653    ▼aPlant  immunity
■690    ▼a0479
■690    ▼a0982
■690    ▼a0307
■690    ▼a0571
■71020▼aIowa  State  University▼bGenetics,  Development  and  Cell  Biology.
■7730  ▼tDissertations  Abstracts  International▼g86-12B.
■790    ▼a0097
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17356505▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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