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Genetic and Environmental Factors Impacting Response to Selection of Flowering Time and Mycotoxin Production in Maize
Genetic and Environmental Factors Impacting Response to Selection of Flowering Time and Mycotoxin Production in Maize
Detailed Information
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202105630
- ISBN
- 9798297622487
- DDC
- 630
- 저자명
- Butoto, Eric.
- 서명/저자
- Genetic and Environmental Factors Impacting Response to Selection of Flowering Time and Mycotoxin Production in Maize
- 발행사항
- [Sl] : North Carolina State University, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 223 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-04, Section: B.
- 주기사항
- Advisor: Holland, James B.;Rellan Alvarez, Ruben.
- 학위논문주기
- Thesis (Ph.D.)--North Carolina State University, 2025.
- 초록/해제
- 요약Understanding the genetic and environmental factors that impact response to selection for important traits such as flowering time and disease resistance is essential to crop improvements in the face of a changing climate and to ensuring long-term food security.In Chapter 1, I review the history of maize breeding in the United States and highlight the importance of flowering time in maize adaptation, focusing particularly on the adaptation of tropical maize populations to temperate regions. I then discuss how genetic diversity influences the response to selection for flowering time. Finally, I detail efforts to understand and breed for resistance to Fusarium ear rot and fumonisin contamination, which have significant implications for human and animal health.In Chapter 2, I investigate how initial genetic diversity influences the response to selection for flowering time across different maize populations with differing amounts of initial genetic diversity. Populations with greater molecular diversity generally showed stronger selection responses, though exceptions highlight the roles of breeding history and genetic architecture. Tropical populations responded more strongly at higher latitudes due to photoperiod sensitivity. Limited evidence for selection at known flowering time genes suggests a largely polygenic basis. These results emphasize the importance of both genetic diversity and trait architecture in guiding crop improvement.In Chapter 3, I introgressed resistance alleles for Fusarium ear rot and fumonisin contamination from GE440, a highly resistant inbred, into LH132, a susceptible but elite commercial inbred. I developed improved backcross lines that maintained agronomic performance and yield. Genotyping of these lines revealed large introgression regions associated with resistance, which aligns with previous mapping studies. While these regions are broad and contain many genes, they offer a valuable starting point for identifying resistance genes. Importantly, the developed lines represent useful resources for breeders.In Chapter 4, I investigate the effects of Bt maize on Fusarium ear rot and fumonisin contamination and the environmental factors influencing these two traits. Bt hybrids generally reduced Fusarium ear rot and insect feeding, though differences in fumonisin levels were minimal due to limited variation in the sampled environments. I identified several environmental covariates associated with disease severity. The results from this chapter highlight the complex interactions among pathogens, mycotoxins, insect pests, and environmental conditions and demonstrate the need for broader, multi-environmental studies to understand these dynamics better.
- 일반주제명
- Agricultural production
- 일반주제명
- Flowers & plants
- 일반주제명
- Domestication
- 일반주제명
- Corn
- 일반주제명
- Adaptation
- 일반주제명
- Chromosomes
- 일반주제명
- Sorghum
- 일반주제명
- Genomes
- 일반주제명
- Germplasm
- 일반주제명
- Crop diseases
- 일반주제명
- Circadian rhythm
- 일반주제명
- Statistical significance
- 일반주제명
- Genetic diversity
- 일반주제명
- Genotype & phenotype
- 일반주제명
- Genes
- 일반주제명
- Agriculture
- 일반주제명
- Climate change
- 키워드
- Maize breeding
- 키워드
- Flowering time
- 기본자료저록
- Dissertations Abstracts International. 87-04B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008260126s2025 us c eng d■001000017360867
■00520260202105630
■006m o d
■007cr#unu||||||||
■020 ▼a9798297622487
■035 ▼a(MiAaPQ)AAI32331609
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a630
■1001 ▼aButoto, Eric.
■24510▼aGenetic and Environmental Factors Impacting Response to Selection of Flowering Time and Mycotoxin Production in Maize
■260 ▼a[Sl]▼bNorth Carolina State University▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a223 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-04, Section: B.
■500 ▼aAdvisor: Holland, James B.;Rellan Alvarez, Ruben.
■5021 ▼aThesis (Ph.D.)--North Carolina State University, 2025.
■520 ▼aUnderstanding the genetic and environmental factors that impact response to selection for important traits such as flowering time and disease resistance is essential to crop improvements in the face of a changing climate and to ensuring long-term food security.In Chapter 1, I review the history of maize breeding in the United States and highlight the importance of flowering time in maize adaptation, focusing particularly on the adaptation of tropical maize populations to temperate regions. I then discuss how genetic diversity influences the response to selection for flowering time. Finally, I detail efforts to understand and breed for resistance to Fusarium ear rot and fumonisin contamination, which have significant implications for human and animal health.In Chapter 2, I investigate how initial genetic diversity influences the response to selection for flowering time across different maize populations with differing amounts of initial genetic diversity. Populations with greater molecular diversity generally showed stronger selection responses, though exceptions highlight the roles of breeding history and genetic architecture. Tropical populations responded more strongly at higher latitudes due to photoperiod sensitivity. Limited evidence for selection at known flowering time genes suggests a largely polygenic basis. These results emphasize the importance of both genetic diversity and trait architecture in guiding crop improvement.In Chapter 3, I introgressed resistance alleles for Fusarium ear rot and fumonisin contamination from GE440, a highly resistant inbred, into LH132, a susceptible but elite commercial inbred. I developed improved backcross lines that maintained agronomic performance and yield. Genotyping of these lines revealed large introgression regions associated with resistance, which aligns with previous mapping studies. While these regions are broad and contain many genes, they offer a valuable starting point for identifying resistance genes. Importantly, the developed lines represent useful resources for breeders.In Chapter 4, I investigate the effects of Bt maize on Fusarium ear rot and fumonisin contamination and the environmental factors influencing these two traits. Bt hybrids generally reduced Fusarium ear rot and insect feeding, though differences in fumonisin levels were minimal due to limited variation in the sampled environments. I identified several environmental covariates associated with disease severity. The results from this chapter highlight the complex interactions among pathogens, mycotoxins, insect pests, and environmental conditions and demonstrate the need for broader, multi-environmental studies to understand these dynamics better.
■590 ▼aSchool code: 0155.
■650 4▼aAgricultural production
■650 4▼aFlowers & plants
■650 4▼aDomestication
■650 4▼aCorn
■650 4▼aAdaptation
■650 4▼aChromosomes
■650 4▼aSorghum
■650 4▼aGenomes
■650 4▼aGermplasm
■650 4▼aCrop diseases
■650 4▼aCircadian rhythm
■650 4▼aStatistical significance
■650 4▼aGenetic diversity
■650 4▼aGenotype & phenotype
■650 4▼aGenes
■650 4▼aAgriculture
■650 4▼aClimate change
■653 ▼aMaize breeding
■653 ▼aFlowering time
■690 ▼a0473
■690 ▼a0404
■71020▼aNorth Carolina State University.
■7730 ▼tDissertations Abstracts International▼g87-04B.
■790 ▼a0155
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360867▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
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