Premise Of The Study: Evolutionary processes that maintain genetic diversity in plants are likely to include selection imposed by pathogens. Negative frequency-dependent selection is a mechanism for maintenance of resistance polymorphism in plant-pathogen interactions. We explored whether such selection operates in the Bromus tectorum-Ustilago bullata pathosystem. Gene-for-gene relationships between resistance and avirulence loci have been demonstrated for this pathosystem. •
Methods: We used molecular markers and cross-inoculation trials to learn whether the SSR genotypes of the host exhibited resistance to co-occurring pathogen races, whether host genotypes within a population had equal disease probability, and whether a common resistance locus and its corresponding avirulence locus exhibited predicted allele frequency changes during an epidemic. •
Key Results: Five of six putative resistance loci that conferred resistance to co-occurring pathogen races occurred in common host SSR genotypes. Some common genotypes within populations were more likely to be diseased than others, and genotype frequencies sometimes changed across years in patterns consistent with frequency-dependent selection. Observed changes in frequency of resistance and virulence alleles during an epidemic provided further support, but evidence was inconclusive. •
Conclusions: Frequency-dependent selection may operate at endemic disease levels in this pathosystem, but is difficult to detect because many susceptible plants escape infection. Most pathogen isolates were virulent on most host genotypes, minimizing the apparent importance of frequency-dependent selection even during epidemics.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.3732/ajb.0900261 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Mitochondrial DNA mutations in human oocytes undergo frequency-dependent selection but do not increase with age.
bioRxiv
December 2024
Department of Biology, Penn State University, University Park, PA 16802, USA.
Mitochondria, cellular powerhouses, harbor DNA (mtDNA) inherited from the mothers. MtDNA mutations can cause diseases, yet whether they increase with age in human germline cells-oocytes-remains understudied. Here, using highly accurate duplex sequencing of full-length mtDNA, we detected mutations in single oocytes, blood, and saliva in women between 20 and 42 years of age.
View Article and Find Full Text PDFMetapopulation heterogeneities in host mobility, productivity, and immunocompetency always increase virulence and infectiousness.
Proc Natl Acad Sci U S A
December 2024
Complexity Science and Evolution Unit, Okinawa Institute of Science and Technology Graduate University (OIST), Tancha, Onna, Kunigami, Okinawa 904-0495, Japan.
The epidemiology and evolution of diseases unfold in populations that are rarely homogeneous. Instead, hosts infected by pathogens often form metapopulations, in which local populations connected by the movement of hosts experience different demographic and epidemiological conditions. Here, we develop a general theory of the evolution of pathogens in heterogeneous metapopulations.
View Article and Find Full Text PDF3D-printed acoustic metasurface with encapsulated micro-air-bubbles for frequency-selective manipulation.
Lab Chip
December 2024
College of Engineering and Applied Sciences, Nanjing University, Jiangsu 210093, China.
Acoustic waves provide an effective method for object manipulation in microfluidics, often requiring high-frequency ultrasound in the megahertz range when directly handling microsized objects, which can be costly. Micro-air-bubbles in water offer a solution toward low-cost technologies using low-frequency acoustic waves. Owing to their high compressibility and low elastic modulus, these bubbles can exhibit significant expansion and contraction in response to even kilohertz acoustic waves, leading to resonances with frequencies determined and tuned by air-bubble size.
View Article and Find Full Text PDFProficient trigonometrical-fitted two-derivative multistep collocation methods in predictor-corrector approach: Application to perturbed Kepler problem.
MethodsX
December 2024
Institute for Mathematical Research, Universiti Putra Malaysia, 43400 UPM, Serdang, Malaysia.
An efficient trigonometrical-fitted two-derivative multistep collocation (TF-TDMC) method using Legendre polynomials up to order five as the basis functions, has been developed for solving second-order ordinary differential equations with oscillatory solution effectively. Interpolation method of approximated power series and collocation technique of its second and third derivative are implemented in the construction of the methods. Two-derivative multistep collocation methods are developed in predictor and corrector form with varying collocation and interpolation points.
View Article and Find Full Text PDFSocial learning with complex contagion.
Proc Natl Acad Sci U S A
December 2024
Program in Applied Mathematics & Computational Science, University of Pennsylvania, Philadelphia, PA 19104.
Article Synopsis
- Traditional social learning models suggest that individuals imitating successful neighbors rely on simple contagion, often needing only one interaction to change behavior.
- The study introduces a new framework that incorporates both simple payoff-biased imitation and complex contagion, allowing for multiple exposures before individuals decide to alter their behavior.
- This updated model produces distinct outcomes in various games (like the Prisoner’s Dilemma and Coordination game) compared to traditional models, revealing how social behaviors can evolve in more realistic ways based on the interplay between contagion complexity and imitation bias.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!