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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...
Ecological and Evolutionary Impacts of Root and Rhizosphere Interactions on Plant Chemical Defenses

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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  
Greenhouse competition
키워드  
Microbial interactions
키워드  
Plant defense
키워드  
Plant-herbivore interactions
키워드  
Plant-soil feedbacks
기타저자  
Cornell University Ecology and Evolutionary Biology
기본자료저록  
Dissertations Abstracts International. 86-03B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■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.

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