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The Aphid Holobiont and the Development of Transgenic Strategies for Polerovirus Control
The Aphid Holobiont and the Development of Transgenic Strategies for Polerovirus Control
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105316
- ISBN
- 9798273309685
- DDC
- 581
- 서명/저자
- The Aphid Holobiont and the Development of Transgenic Strategies for Polerovirus Control
- 발행사항
- [Sl] : Cornell University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 280 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-07, Section: B.
- 주기사항
- Advisor: Cilia, Michelle.
- 학위논문주기
- Thesis (Ph.D.)--Cornell University, 2025.
- 초록/해제
- 요약Potato leafroll virus (PLRV), vectored by the green peach aphid, Myzus persicae, is a polerovirus causing significant economic damage in global potato production. PLRV infection results in stunting, leaf rolling, and net necrosis on tubers threatening global cultivation, especially in regions with limited vector management options. Management relies on neonicotinoid insecticides, though increasing regulatory constraints and resistance in vector populations demand the development of alternative tactics. To address this need, I applied a systems level analysis of host, viral proteins, aphid biology, and microbial interactions that influence virus transmission. I then leveraged these insights to design novel virus management strategies.The green peach aphid functions as a holobiont, encompassing both aphid-associated microorganisms and plant pathogenic viruses. I explored ideas to address the pressing need for aphid and PLRV management by targeting interactions within the holobiont. I then delved into PLRV's impact on the aphid holobiont and highlight literature showing the evolutionary and mechanistic ways in which PLRV influences the holobiont during plant infection. In plants, posttranscriptional gene silencing (PTGS) is a targeted antiviral defense mechanism, which PLRV suppresses using the P0 protein. P0 not only inhibits PTGS in plants but also suppresses aphid immunity against the aphid-infecting virus, Myzus persicae densovirus (MpDNV). Plant expression of P0 independent of PLRV increases MpDNV titer in aphids and enhances aphid fecundity. By generating mutants of the F-box motif critical for P0 function, I demonstrated that the activity of P0 on aphid biology is dependent on functional P0 activity. Further, I showed that additional viral proteins from other plant viruses modulate MpDNV and fecundity, suggesting that aphid RNAi pathways are finely tuned to plant RNAi pathways, independent of vector capabilities and transmission. This work reveals the molecular mechanisms underpinning vector manipulation expected to promote the spread of plant viruses in nature. To dissect aphid-borne transmission, our collaborative group previously solved the 3-D structure of the N-terminal domain of the polerovirus readthrough protein, referred to as the NRTD, for PLRV and the related Turnip yellows virus. Laboratory transmission assays showed that transgenic potato plants expressing the NRTD reduce PLRV acquisition and transmission. To test whether NRTD transgenic plant technology can be scaled to field application, we conducted two years of greenhouse experiments using mass release of thousands of PLRV-viruliferous aphids with NRTD plants as border rows or intercropped with non-transgenic plants. The NRTD plants reduce aphid movement, PLRV transmission, PLRV titer in aphids, and alter the titer of insect-infecting viruses in aphids. Select mutations in the NRTD protein structurally predicted to bind aphid receptors are insecticidal to Myzus persicae and Aphis gossypii, the cotton aphid, when orally delivered via artificial diets. Together, the NRTD technology may serve as a biological control of poleroviruses and their aphid vectors.
- 일반주제명
- Plant pathology
- 일반주제명
- Virology
- 일반주제명
- Entomology
- 일반주제명
- Plant sciences
- 일반주제명
- Biology
- 키워드
- Aphid
- 키워드
- Capsid proteins
- 기타저자
- Cornell University Plant Pathology and Plant-Microbe Biology
- 기본자료저록
- Dissertations Abstracts International. 87-07B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
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■00520260202105316
■006m o d
■007cr#unu||||||||
■020 ▼a9798273309685
■035 ▼a(MiAaPQ)AAI32286807
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a581
■1001 ▼aPreising, Stephanie Eliza.
■24510▼aThe Aphid Holobiont and the Development of Transgenic Strategies for Polerovirus Control
■260 ▼a[Sl]▼bCornell University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a280 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-07, Section: B.
■500 ▼aAdvisor: Cilia, Michelle.
■5021 ▼aThesis (Ph.D.)--Cornell University, 2025.
■520 ▼aPotato leafroll virus (PLRV), vectored by the green peach aphid, Myzus persicae, is a polerovirus causing significant economic damage in global potato production. PLRV infection results in stunting, leaf rolling, and net necrosis on tubers threatening global cultivation, especially in regions with limited vector management options. Management relies on neonicotinoid insecticides, though increasing regulatory constraints and resistance in vector populations demand the development of alternative tactics. To address this need, I applied a systems level analysis of host, viral proteins, aphid biology, and microbial interactions that influence virus transmission. I then leveraged these insights to design novel virus management strategies.The green peach aphid functions as a holobiont, encompassing both aphid-associated microorganisms and plant pathogenic viruses. I explored ideas to address the pressing need for aphid and PLRV management by targeting interactions within the holobiont. I then delved into PLRV's impact on the aphid holobiont and highlight literature showing the evolutionary and mechanistic ways in which PLRV influences the holobiont during plant infection. In plants, posttranscriptional gene silencing (PTGS) is a targeted antiviral defense mechanism, which PLRV suppresses using the P0 protein. P0 not only inhibits PTGS in plants but also suppresses aphid immunity against the aphid-infecting virus, Myzus persicae densovirus (MpDNV). Plant expression of P0 independent of PLRV increases MpDNV titer in aphids and enhances aphid fecundity. By generating mutants of the F-box motif critical for P0 function, I demonstrated that the activity of P0 on aphid biology is dependent on functional P0 activity. Further, I showed that additional viral proteins from other plant viruses modulate MpDNV and fecundity, suggesting that aphid RNAi pathways are finely tuned to plant RNAi pathways, independent of vector capabilities and transmission. This work reveals the molecular mechanisms underpinning vector manipulation expected to promote the spread of plant viruses in nature. To dissect aphid-borne transmission, our collaborative group previously solved the 3-D structure of the N-terminal domain of the polerovirus readthrough protein, referred to as the NRTD, for PLRV and the related Turnip yellows virus. Laboratory transmission assays showed that transgenic potato plants expressing the NRTD reduce PLRV acquisition and transmission. To test whether NRTD transgenic plant technology can be scaled to field application, we conducted two years of greenhouse experiments using mass release of thousands of PLRV-viruliferous aphids with NRTD plants as border rows or intercropped with non-transgenic plants. The NRTD plants reduce aphid movement, PLRV transmission, PLRV titer in aphids, and alter the titer of insect-infecting viruses in aphids. Select mutations in the NRTD protein structurally predicted to bind aphid receptors are insecticidal to Myzus persicae and Aphis gossypii, the cotton aphid, when orally delivered via artificial diets. Together, the NRTD technology may serve as a biological control of poleroviruses and their aphid vectors.
■590 ▼aSchool code: 0058.
■650 4▼aPlant pathology
■650 4▼aVirology
■650 4▼aEntomology
■650 4▼aPlant sciences
■650 4▼aBiology
■653 ▼aAphid
■653 ▼aCapsid proteins
■653 ▼aPotato leafroll virus
■653 ▼aTransgenic plants
■653 ▼aPLRV transmission
■690 ▼a0480
■690 ▼a0720
■690 ▼a0353
■690 ▼a0306
■690 ▼a0479
■71020▼aCornell University▼bPlant Pathology and Plant-Microbe Biology.
■7730 ▼tDissertations Abstracts International▼g87-07B.
■790 ▼a0058
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360181▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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