The role of overseas genetic surveys to potentially accelerate biological control development for a new Hydrilla verticillata introduction in the USA

Harms, Nathan E.; Williams, Dean A.; Purcell, Matthew F.

doi:10.1007/s10526-020-10050-x

Cited by 9 publications

(6 citation statements)

References 26 publications

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“…For invaders with multiple introduced genotypes, determining how environmental variation contributes to their success, and whether the response to the environment varies by genotype, can improve predictions about which invaders (or genotypes) will become invasive (i.e., using a trait‐based approach; Bhattarai et al, 2017 ; Davidson et al, 2011 ; Weinig et al, 2007 ) and guide decision‐making around management actions (Gaskin et al, 2011 ; Thum, 2018 ). There are a growing number of invaders for which it is clear that management should be tailored at the subspecific level (Blossey & Casagrande, 2016 ; Croy et al, 2020 ; Harms, Shearer, et al, 2020 ; Harms, Williams, & Purcell, 2021 ), and this work further supports continuation of that research direction. How genotypes of introduced species differ in their tolerance or response to environmental variation is key to distinguishing invasive traits, and thus modeling their distribution and impacts in the invaded range.…”

Section: Discussionsupporting

confidence: 64%

“…There are a growing number of invaders for which it is clear that management should be tailored at the subspecific level (Blossey & Casagrande, 2016;Croy et al, 2020;Harms, Shearer, et al, 2020;Harms, Williams, & Purcell, 2021), and this work further supports continuation of that research direction. How genotypes of introduced species differ in their tolerance or response to environmental variation is key to distinguishing invasive traits, and thus modeling their distribution and impacts in the invaded range.…”

Section: Discussionsupporting

confidence: 63%

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Intraspecific trait plasticity to N and P of the wetland invader, Alternanthera philoxeroides under flooded conditions

Harms

Knight

DeRossette

et al. 2023

Ecology and Evolution

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Interactions between invaders and resource availability may explain variation in their success or management efficacy. For widespread invaders, regional variation in plant response to nutrients can reflect phenotypic plasticity of the invader, genetic structure of invading populations, or a combination of the two. The wetland weed Alternanthera philoxeroides (alligatorweed) is established throughout the southeastern United States and California and has high genetic diversity despite primarily spreading clonally. Despite its history in the United States, the role of genetic variation for invasion and management success is only now being uncovered. To better understand how nutrients and genotype may influence A. philoxeroides invasion, we measured the response of plants from 26 A. philoxeroides populations (three cp haplotypes) to combinations of nitrogen (4 or 200 mg/L N) and phosphorus (0.4 or 40 mg/L P). We measured productivity (biomass accumulation and allocation), plant architecture (stem diameter and thickness, branching intensity), and foliar traits (toughness, dry matter content, percent N, and percent P). A short‐term developmental assay was also conducted by feeding a subset of plants from the nutrient experiment to the biological control agent Agasicles hygrophila , to determine whether increased availability of N or P to its host influenced agent performance, as has been previously suggested. Alternanthera philoxeroides haplotype Ap1 was more plastic than other haplotypes in response to nutrient amendments, producing more than double the biomass from low to high N and 50%–68% higher shoot: root ratio than other haplotypes in the high N treatment. Alternanthera philoxeroides haplotypes differed in seven of 10 variables in response to increased N. We found no differences in short‐term A. hygrophila development between haplotypes but mass was 23% greater in high than low N treatments. This study is the first to explore the interplay between nutrient availability, genetic variation, and phenotypic plasticity in invasive characteristics of the global invader, A. philoxeroides .

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Section: Discussionsupporting

confidence: 64%

Section: Discussionsupporting

confidence: 63%

Intraspecific trait plasticity to N and P of the wetland invader, Alternanthera philoxeroides under flooded conditions

Harms

Knight

DeRossette

et al. 2023

Ecology and Evolution

Self Cite

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“…During biological control development, knowledge about the geographic origin of target weeds can be used to focus prospecting efforts in regions with matching host genotypes and similar climates (e.g., Blossey et al 1994;Harms et al 2021). Because of the genetic similarity between USA and European samples, Europe should be a priority for identifying potential biocontrol agents.…”

Section: Discussionmentioning

confidence: 99%

Assessing the genetic diversity of Nymphoides peltata in the native and adventive range using microsatellite markers

Tippery,

Harms,

Purcell

et al. 2024

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Nymphoides peltata (yellow floatingheart), native to Eurasia, is an invasive plant in the USA, where it grows in relatively isolated but widespread populations. The species is capable of sexual reproduction by seed and asexual reproduction through fragmentation. Although N. peltata is recognized as a noxious weed, little is known about its geographic region of origin or its dispersal mechanisms and relative amount of genetic variation in its adventive range. We conducted a genetic analysis of N. peltata by studying 68 localities across the native range and 47 localities in the adventive range, using microsatellite markers to determine genetic variability within and among populations, and to infer regions in the native range from which invasive plants originated. A large number of sites in the USA were genetically identical to one another, and there were two predominant multilocus allele phenotypes that were distributed in the northern and southern latitudes, respectively. Additional USA sites were similar to one of the predominant genetic profiles, with greater genetic diversity in southern populations. The genetically identical sites are consistent with asexual spread, potentially via anthropogenic mechanisms. Plants across the USA range were observed to produce viable seeds, and some genetic variation could be explained by sexual reproduction. All USA plants were more similar to plants in Europe than they were to plants in Asia, indicating that the plants likely were introduced originally from Europe. The existence of two genetic clusters and their similarity to plants in different parts of Europe constitute evidence for at least two N. peltata introductions into the USA.

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“…The PMRU scientists used molecular markers and flow cytometry to determine that the flowering rush ( Butomus umbellatus L.) invasion in western North America is fundamentally different in genotypes, origins, and ploidy from an earlier invasion in eastern North America (Gaskin et al 2021a). The different genotypes show variation in susceptibility to foliar fungal pathogens (Harms et al 2021). Further, the PMRU scientists used genetic tools to determine the distribution of common mullein ( Verbascum thapsus L.) invasion in western North America (Gaskin et al 2021b).…”

Section: Present—ars Weed Science Researchmentioning

confidence: 99%

Agricultural Research Service Weed Science Research: Past, Present, and Future

Young¹,

Anderson²,

Baerson

et al. 2023

Weed Sci

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The U.S. Department of Agriculture–Agricultural Research Service (USDA-ARS) has been a leader in weed science research covering topics ranging from the development and use of integrated weed management (IWM) tactics to basic mechanistic studies, including biotic resistance of desirable plant communities and herbicide resistance. ARS weed scientists have worked in agricultural and natural ecosystems, including agronomic and horticultural crops, pastures, forests, wild lands, aquatic habitats, wetlands, and riparian areas. Through strong partnerships with academia, state agencies, private industry, and numerous federal programs, ARS weed scientists have made contributions to discoveries in the newest fields of robotics and genetics, as well as the traditional and fundamental subjects of weed–crop competition and physiology and integration of weed control tactics and practices. Weed science at ARS is often overshadowed by other research topics; thus, few are aware of the long history of ARS weed science and its important contributions. This review is the result of a symposium held at the Weed Science Society of America’s 62nd Annual Meeting in 2022 that included 10 separate presentations in a virtual Weed Science Webinar Series. The overarching themes of management tactics (IWM, biological control, and automation), basic mechanisms (competition, invasive plant genetics, and herbicide resistance), and ecosystem impacts (invasive plant spread, climate change, conservation, and restoration) represent core ARS weed science research that is dynamic and efficacious and has been a significant component of the agency’s national and international efforts. This review highlights current studies and future directions that exemplify the science and collaborative relationships both within and outside ARS. Given the constraints of weeds and invasive plants on all aspects of food, feed, and fiber systems, there is an acknowledged need to face new challenges, including agriculture and natural resources sustainability, economic resilience and reliability, and societal health and well-being.

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The role of overseas genetic surveys to potentially accelerate biological control development for a new Hydrilla verticillata introduction in the USA

Cited by 9 publications

References 26 publications

Intraspecific trait plasticity to N and P of the wetland invader, Alternanthera philoxeroides under flooded conditions

Intraspecific trait plasticity to N and P of the wetland invader, Alternanthera philoxeroides under flooded conditions

Assessing the genetic diversity of Nymphoides peltata in the native and adventive range using microsatellite markers

Agricultural Research Service Weed Science Research: Past, Present, and Future

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