서브메뉴
검색
Ecological and Evolutionary Impacts of Root and Rhizosphere Interactions on Plant Chemical Defenses
Ecological and Evolutionary Impacts of Root and Rhizosphere Interactions on Plant Chemical Defenses
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20250211152717
- ISBN
- 9798384053200
- DDC
- 574.5
- 저자명
- Bass, Ethan.
- 서명/저자
- Ecological and Evolutionary Impacts of Root and Rhizosphere Interactions on Plant Chemical Defenses
- 발행사항
- [Sl] : Cornell University, 2024
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2024
- 형태사항
- 311 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
- 주기사항
- Advisor: Kessler, Andre.
- 학위논문주기
- Thesis (Ph.D.)--Cornell University, 2024.
- 초록/해제
- 요약This dissertation addresses the effects of belowground interactions on plant community assembly and the evolution of chemical defenses. In the first three chapters, tall goldenrod (Solidago altissima) is used as a model system to study how microbial interactions influence competitive outcomes and the evolution of chemical defenses in goldenrod roots. In chapter one, I present the results of a greenhouse competition experiment designed to test the relative importance and interactive effects of herbivory and successional shifts in soil microbial communities on the growth and competitive ability of Solidago altissima. The magnitude of plant-soil feedbacks was strongly influenced by both herbivory and competitor species. The strong effects of antagonistic microbial interactions on goldenrod performance and competitive outcomes suggest that goldenrod plants should be under selection to resist these negative plant-soil feedbacks. In chapters two and three, I explore the role of polyacetylenes (a class of fatty acid-derived secondary metabolites produced in the roots of goldenrod) in the mitigation of these antagonistic microbial interactions. In chapter two, I investigated how selection on polyacetylenes is influenced by successional shifts in soil microbial communities. The benefits of polyacetylene production were highly dependent on microbial context, with the strongest benefits occurring in the late successional microbial background, implying that selection on polyacetylenes is driven primarily by microbial interactions rather than allelopathic suppression of competitors. In chapter three, I address potential constraints on the evolution of polyacetylenes associated with the inhibition of the model arbuscular mycorrhizal fungus, Rhizophagus irregularis. The results suggest that ecological costs associated with the suppression of mycorrhizae may constrain investment in chemical defenses. In chapter four, I address the role of belowground plant-plant interactions in mediating associational effects in an agricultural intercropping system. Specifically, I tested the effects of Desmodium intercropping on maize secondary metabolism and herbivore resistance and compared the effects of above- and belowground neighbor cues. The results suggest that soil-borne cues play an important role in mediating the effects of neighboring plants on resistance to insect herbivory in this system. Overall, my dissertation provides insights into the role of rhizosphere interactions in plant community assembly and the evolution of plant secondary metabolism.
- 일반주제명
- Ecology
- 일반주제명
- Evolution & development
- 일반주제명
- Plant sciences
- 일반주제명
- Microbiology
- 키워드
- Chemical ecology
- 키워드
- Plant defense
- 기타저자
- Cornell University Ecology and Evolutionary Biology
- 기본자료저록
- Dissertations Abstracts International. 86-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008250123s2024 us c eng d■001000017163508
■00520250211152717
■006m o d
■007cr#unu||||||||
■020 ▼a9798384053200
■035 ▼a(MiAaPQ)AAI31489356
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a574.5
■1001 ▼aBass, Ethan.▼0(orcid)0000-0002-6175-6739
■24510▼aEcological and Evolutionary Impacts of Root and Rhizosphere Interactions on Plant Chemical Defenses
■260 ▼a[Sl]▼bCornell University▼c2024
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2024
■300 ▼a311 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 86-03, Section: B.
■500 ▼aAdvisor: Kessler, Andre.
■5021 ▼aThesis (Ph.D.)--Cornell University, 2024.
■520 ▼aThis dissertation addresses the effects of belowground interactions on plant community assembly and the evolution of chemical defenses. In the first three chapters, tall goldenrod (Solidago altissima) is used as a model system to study how microbial interactions influence competitive outcomes and the evolution of chemical defenses in goldenrod roots. In chapter one, I present the results of a greenhouse competition experiment designed to test the relative importance and interactive effects of herbivory and successional shifts in soil microbial communities on the growth and competitive ability of Solidago altissima. The magnitude of plant-soil feedbacks was strongly influenced by both herbivory and competitor species. The strong effects of antagonistic microbial interactions on goldenrod performance and competitive outcomes suggest that goldenrod plants should be under selection to resist these negative plant-soil feedbacks. In chapters two and three, I explore the role of polyacetylenes (a class of fatty acid-derived secondary metabolites produced in the roots of goldenrod) in the mitigation of these antagonistic microbial interactions. In chapter two, I investigated how selection on polyacetylenes is influenced by successional shifts in soil microbial communities. The benefits of polyacetylene production were highly dependent on microbial context, with the strongest benefits occurring in the late successional microbial background, implying that selection on polyacetylenes is driven primarily by microbial interactions rather than allelopathic suppression of competitors. In chapter three, I address potential constraints on the evolution of polyacetylenes associated with the inhibition of the model arbuscular mycorrhizal fungus, Rhizophagus irregularis. The results suggest that ecological costs associated with the suppression of mycorrhizae may constrain investment in chemical defenses. In chapter four, I address the role of belowground plant-plant interactions in mediating associational effects in an agricultural intercropping system. Specifically, I tested the effects of Desmodium intercropping on maize secondary metabolism and herbivore resistance and compared the effects of above- and belowground neighbor cues. The results suggest that soil-borne cues play an important role in mediating the effects of neighboring plants on resistance to insect herbivory in this system. Overall, my dissertation provides insights into the role of rhizosphere interactions in plant community assembly and the evolution of plant secondary metabolism.
■590 ▼aSchool code: 0058.
■650 4▼aEcology
■650 4▼aEvolution & development
■650 4▼aPlant sciences
■650 4▼aMicrobiology
■653 ▼aChemical ecology
■653 ▼aGreenhouse competition
■653 ▼aMicrobial interactions
■653 ▼aPlant defense
■653 ▼aPlant-herbivore interactions
■653 ▼aPlant-soil feedbacks
■690 ▼a0329
■690 ▼a0412
■690 ▼a0479
■690 ▼a0410
■71020▼aCornell University▼bEcology and Evolutionary Biology.
■7730 ▼tDissertations Abstracts International▼g86-03B.
■790 ▼a0058
■791 ▼aPh.D.
■792 ▼a2024
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17163508▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
