| Abstract Detail
Symbioses: Plant, Animal, and Microbe Interactions Carpenter, Elizabeth Marjorie [1], Dlugosch, Katrina [2]. Growth-defense trade-off in invasive Centaurea solstitialis. Yellow star-thistle (Centaurea solstitialis) is an invasive annual plant that has caused considerable environmental damage since its establishment in North and South America. Invading populations in California (United States) have evolved increased growth, and show evidence of adaptive evolution in genes associated with defense. We hypothesize that invasive C. solstitialis has evolved larger plant growth while trading off lower investment in defense functions. We tested this hypothesis by comparing immune responses (the oxidative burst) of native and invaded range plant genotypes in response to wounding and exposure to both native range and invaded range bacteria. were. We found that invasive C. solstitialis showed a lowered immune response to wounding and to both invaded and native range bacteria. Immune response was negatively related to plant size, consistent with evolution along a growth-defense trade-off. These results suggest that invasive yellow star-thistle might be benefiting from selection for investment away from defense functions. We are currently investigating the genetic nature of this trade-off by QTL mapping the genetic basis of divergence in both size and immune activity. Future studies will investigate whether C. solstitialis invader evolution could be driven by the release from native range bacteria. Log in to add this item to your schedule
1 - University of Arizona, Ecology and Evolutionary Biology, 1041 E. Lowell St, Tuscon, AZ, 85721, USA 2 - University Of Arizona, ECOL AND EVOL BIOLOGY, P.O. Box 210088, Tucson, AZ, 85721, United States
Keywords: Microbiome biotic interactions invader yellow starthistle adaptation plant defense tradeoff growth InvasiveĀ invasive plants microbe Defense.
Presentation Type: Poster Session: P, Symbioses: Plant, Animal, and Microbe Interactions Posters Location: Arizona Ballroom/Starr Pass Date: Monday, July 29th, 2019 Time: 5:30 PM This poster will be presented at 6:15 pm. The Poster Session runs from 5:30 pm to 7:00 pm. Posters with odd poster numbers are presented at 5:30 pm, and posters with even poster numbers are presented at 6:15 pm. Number: PSM010 Abstract ID:1004 Candidate for Awards:None |