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Understanding the Diversity of Plant Pattern Recognition Receptors to Engineer and Deploy Expanded Bacterial Recognition
Understanding the Diversity of Plant Pattern Recognition Receptors to Engineer and Deploy Expanded Bacterial Recognition
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202103626
- ISBN
- 9798290613536
- DDC
- 581
- 저자명
- Li, Tianrun.
- 서명/저자
- Understanding the Diversity of Plant Pattern Recognition Receptors to Engineer and Deploy Expanded Bacterial Recognition
- 발행사항
- [Sl] : University of California, Davis, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 124 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-01, Section: B.
- 주기사항
- Advisor: Coaker, Gitta.
- 학위논문주기
- Thesis (Ph.D.)--University of California, Davis, 2025.
- 초록/해제
- 요약Bacterial pathogens significantly threaten global agriculture production. Plants recognize these pathogens through cell-surface localized pattern recognition receptors (PRRs), which detect conserved microbial features and initiate immune responses. Many bacterial features perceived by PRRs are immunogenic epitopes derived from protein components such as flagellin and cold shock proteins. However, pathogens frequently evade immune detection by carrying modified epitopes that hinder PRR recognition. Although extensive research has examined the recognition specificity of PRRs, studies predominantly focus on the interaction between model pathogens and PRRs from model plants. Consequently, the diversity of PRR recognition capacities, particularly in non-cultivated species, remains poorly explored.In this thesis, I discussed the evolutionary path and the modes of functional diversification in plant PRRs. I surveyed the recognition of common microbial features in 97 Rutaceae genotypes and demonstrated the functionality of citrus chitin and flagellin receptors across responsive and non-responsive genotypes. I also examined six plant Flagellin-sensing 2 (FLS2) receptor homologs to characterize their recognition profiles against polymorphic flagellin epitope (flg22). I revealed that these receptors exhibit both expanded and distinct perception profile. Using a combination of diversity analyses, AlphaFold modeling, and amino acid property assessments, I identified key residues that contribute to expanded flagellin recognition, primarily located in the flg22 C‑terminus and co‑receptor binding regions. Through synthetic biology approaches, I successfully engineered expanded or altered recognition profile from Quercus variabilis and Vitis riparia FLS2 homologs against Ralstonia and Agrobacterium flagellin epitope. Finally, I introduced a dual PRR stack into potato cultivar 'Atlantic' to expand its recognition against bacterial 3-OH fatty acids and polymorphic flagellin. I demonstrated the transgenic potatoes are more resistant against soil-borne pathogen Ralstonia solanacearum, but not insect vectored Candidatus Liberibacter solanacearum.Collectively, this thesis provides insight into diversity of microbial feature recognition both within and across diverse plant families. This thesis also demonstrated that expanded bacterial flagellin recognition emerged independently and can be more common than previously appreciated. Finally, this work developed a general strategy to guide the rational engineering of PRRs and highlighted the efficacy of using PRR to control bacterial disease.
- 일반주제명
- Plant pathology
- 일반주제명
- Microbiology
- 일반주제명
- Molecular biology
- 키워드
- Plant immunity
- 기타저자
- University of California, Davis Plant Pathology
- 기본자료저록
- Dissertations Abstracts International. 87-01B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■006m o d
■007cr#unu||||||||
■020 ▼a9798290613536
■035 ▼a(MiAaPQ)AAI32046441
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a581
■1001 ▼aLi, Tianrun.
■24510▼aUnderstanding the Diversity of Plant Pattern Recognition Receptors to Engineer and Deploy Expanded Bacterial Recognition
■260 ▼a[Sl]▼bUniversity of California, Davis▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a124 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-01, Section: B.
■500 ▼aAdvisor: Coaker, Gitta.
■5021 ▼aThesis (Ph.D.)--University of California, Davis, 2025.
■520 ▼aBacterial pathogens significantly threaten global agriculture production. Plants recognize these pathogens through cell-surface localized pattern recognition receptors (PRRs), which detect conserved microbial features and initiate immune responses. Many bacterial features perceived by PRRs are immunogenic epitopes derived from protein components such as flagellin and cold shock proteins. However, pathogens frequently evade immune detection by carrying modified epitopes that hinder PRR recognition. Although extensive research has examined the recognition specificity of PRRs, studies predominantly focus on the interaction between model pathogens and PRRs from model plants. Consequently, the diversity of PRR recognition capacities, particularly in non-cultivated species, remains poorly explored.In this thesis, I discussed the evolutionary path and the modes of functional diversification in plant PRRs. I surveyed the recognition of common microbial features in 97 Rutaceae genotypes and demonstrated the functionality of citrus chitin and flagellin receptors across responsive and non-responsive genotypes. I also examined six plant Flagellin-sensing 2 (FLS2) receptor homologs to characterize their recognition profiles against polymorphic flagellin epitope (flg22). I revealed that these receptors exhibit both expanded and distinct perception profile. Using a combination of diversity analyses, AlphaFold modeling, and amino acid property assessments, I identified key residues that contribute to expanded flagellin recognition, primarily located in the flg22 C‑terminus and co‑receptor binding regions. Through synthetic biology approaches, I successfully engineered expanded or altered recognition profile from Quercus variabilis and Vitis riparia FLS2 homologs against Ralstonia and Agrobacterium flagellin epitope. Finally, I introduced a dual PRR stack into potato cultivar 'Atlantic' to expand its recognition against bacterial 3-OH fatty acids and polymorphic flagellin. I demonstrated the transgenic potatoes are more resistant against soil-borne pathogen Ralstonia solanacearum, but not insect vectored Candidatus Liberibacter solanacearum.Collectively, this thesis provides insight into diversity of microbial feature recognition both within and across diverse plant families. This thesis also demonstrated that expanded bacterial flagellin recognition emerged independently and can be more common than previously appreciated. Finally, this work developed a general strategy to guide the rational engineering of PRRs and highlighted the efficacy of using PRR to control bacterial disease.
■590 ▼aSchool code: 0029.
■650 4▼aPlant pathology
■650 4▼aMicrobiology
■650 4▼aMolecular biology
■653 ▼aDisease resistance
■653 ▼aMicrobe associated molecular patterns
■653 ▼aNatural variation
■653 ▼aPattern recognition receptors
■653 ▼aPlant immunity
■653 ▼aProtein engineering
■690 ▼a0480
■690 ▼a0410
■690 ▼a0307
■71020▼aUniversity of California, Davis▼bPlant Pathology.
■7730 ▼tDissertations Abstracts International▼g87-01B.
■790 ▼a0029
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17357981▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


