Mating system of Centaurea aspera (asteraceae) polyploid relatives - Short communication

[EN] Centaurea aspera polyploid complex represents a comprehensive model. The aim of this short communication was to study the mating system of the three main species. The results showed that allotetraploid C. seridis was self-compatible (SC), while autotetraploid C. gentilii was self-incompatible (SI) as the diploid parental C. aspera (SI).This work was supported by Generalitat Valenciana through AICO/2019/227 project.Ferriol Molina, M.; Garmendia, A.; Benavent, D.; Ferrer-Gallego, PP.; Merle Farinós, HB. (2021). Mating system of Centaurea aspera (asteraceae) polyploid relatives - Short communication. Plant Biosystems - An International Journal Dealing with all Aspects of Plant Biology. 155(3):415-416. https://doi.org/10.1080/11263504.2020.1852333S4154161553Bellanger, S., Guillemin, J.-P., & Darmency, H. (2014). Pseudo-self-compatibility in Centaurea cyanus L. Flora - Morphology, Distribution, Functional Ecology of Plants, 209(7), 325-331. doi:10.1016/j.flora.2014.04.002Ferriol, M., Garmendia, A., Gonzalez, A., & Merle, H. (2015). Allogamy-Autogamy Switch Enhance Assortative Mating in the Allotetraploid Centaurea seridis L. Coexisting with the Diploid Centaurea aspera L. and Triggers the Asymmetrical Formation of Triploid Hybrids. PLOS ONE, 10(10), e0140465. doi:10.1371/journal.pone.0140465Ferriol, M., Garmendia, A., Ruiz, J. J., Merle, H., & Boira, H. (2012). Morphological and molecular analysis of natural hybrids between the diploidCentaurea asperaL. and the tetraploidC. seridisL. (Compositae). Plant Biosystems - An International Journal Dealing with all Aspects of Plant Biology, 146(sup1), 86-100. doi:10.1080/11263504.2012.727878Ferriol, M., Merle, H., & Garmendia, A. (2014). Microsatellite evidence for low genetic diversity and reproductive isolation in tetraploidCentaurea seridis(Asteraceae) coexisting with diploidCentaurea asperaand triploid hybrids in contact zones. Botanical Journal of the Linnean Society, 176(1), 82-98. doi:10.1111/boj.12194Garmendia, A., Ferriol, M., Benavent, D., Ferrer-Gallego, P. P., & Merle, H. (2020). Intra- and Inter-Specific Crosses among Centaurea aspera L. (Asteraceae) Polyploid Relatives—Influences on Distribution and Polyploid Establishment. Plants, 9(9), 1142. doi:10.3390/plants9091142Garmendia, A., Ferriol, M., Juarez, J., Zając, A., Kałużny, K., & Merle, H. (2015). A rare case of a natural contact zone in Morocco between an autopolyploid and an allopolyploid ofCentaurea asperawith sterile tetraploid hybrids. Plant Biology, 17(3), 746-757. doi:10.1111/plb.12284Jiao, Y., Wickett, N. J., Ayyampalayam, S., Chanderbali, A. S., Landherr, L., Ralph, P. E., … dePamphilis, C. W. (2011). Ancestral polyploidy in seed plants and angiosperms. Nature, 473(7345), 97-100. doi:10.1038/nature09916Levin, D. A. (2019). Plant speciation in the age of climate change. Annals of Botany, 124(5), 769-775. doi:10.1093/aob/mcz108Soltis, D. E., Albert, V. A., Leebens-Mack, J., Bell, C. D., Paterson, A. H., Zheng, C., … Soltis, P. S. (2009). Polyploidy and angiosperm diversification. American Journal of Botany, 96(1), 336-348. doi:10.3732/ajb.080007

On the global well-posedness of energy-critical Schr\"odinger equations in curved spaces

In this paper we present a method to study global regularity properties of solutions of large-data critical Schrodinger equations on certain noncompact Riemannian manifolds. We rely on concentration compactness arguments and a global Morawetz inequality adapted to the geometry of the manifold (in other words we adapt the method of Kenig-Merle to the variable coefficient case), and a good understanding of the corresponding Euclidean problem (in our case the main theorem of Colliander-Keel-Staffilani-Takaoka-Tao). As an application we prove global well-posedness and scattering in $H^1$ for the energy-critical defocusing initial-value problem (i\partial_t+\Delta_\g)u=u|u|^{4} on the hyperbolic space $H^3$.Comment: 43 pages, references adde

Announcing Two More Speakers for the University of Dayton\u27s Fourth Institute on Federal Taxation

News release announcing Donald C. Alexander and Merle H. Miller as speaker at the University of Dayton\u27s fourth Institute on Federal Taxation

Isolatedness of characteristic points at blow-up for a semilinear wave equation in one space dimension

We consider the semilinear wave equation with power nonlinearity in one space dimension. We consider an arbitrary blow-up solution $u(x,t)$, the graph $x\mapsto T(x)$ of its blow-up points and ${\cal S}\subset {\mathbb R}$ the set of all characteristic points. We show that {\ca S} is locally finite.Comment: 57 page

Blow-up behavior outside the origin for a semilinear wave equation in the radial case

We consider the semilinear wave equation in the radial case with conformal subcritical power nonlinearity. If we consider a blow-up point different from the origin, then we exhibit a new Lyapunov functional which is a perturbation of the one dimensional case and extend all our previous results known in the one-dimensional case. In particular, we show that the blow-up set near non-zero non-characteristic points is of class $C^1$, and that the set of characteristic points is made of concentric spheres in finite number in $\{\frac 1R \le |x|\le R\}$ for any $R>1$.Comment: 21 page