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Genetic Control Of Arbuscular Mycorrhizal Colonization In Helianthus Annuus, Katherine Stahlhut
Genetic Control Of Arbuscular Mycorrhizal Colonization In Helianthus Annuus, Katherine Stahlhut
Honors Undergraduate Theses
Plant symbiosis with arbuscular mycorrhizal (AM) fungi provides many benefits for plants, including increased nutrient uptake, drought tolerance, and belowground pathogen resistance. In order to have a better understanding of the genetic architecture of mycorrhizal symbiosis, we conducted a genome-wide association study (GWAS) by phenotyping a diversity panel of cultivated sunflower (Helianthus annuus) for root colonization under inoculation with the AM fungus Rhizophagus intraradices. This mapping panel consists of 261 inbred lines that capture approximately 90% of the genetic diversity present in the cultivated sunflower germplasm. Using a mixed linear model approach with a high-density genetic map, we …
Role Of Polyploidy In Leaf Functional Trait Evolution Across Wild Helianthus, Anestacia S. Robinson
Role Of Polyploidy In Leaf Functional Trait Evolution Across Wild Helianthus, Anestacia S. Robinson
Honors Undergraduate Theses
Whole genome duplication, or polyploidy, is a common process in plants by which failures in meiosis or fertilization result in offspring with twice the number of chromosomes. This doubles the number of copies of every gene, an effect thought to generate new ‘raw material' upon which natural selection can act. Few studies exist examining the consequences of polyploidy for plant physiological traits. Doubling the number of gene copies may have unknown effects on leaf structure and function. In this study, I compare diploid, tetraploid, and hexaploid species within the genus Helianthus (wild sunflowers). Forty different accessions of wild sunflowers were …