Suchergebnisse

For atlas see Sagra: Cryptogamie pl. 1-20 belong to Pl. cell. ; Published in Spanish as Historia fisica politica y natural de la Isla de Cuba. Dates and volumes vary. ; Atlas cataloged as Flora Cubana o descripcion botanica usos y aplicaciones de las plantas reunidas en la isle e Cuba. ; TL-2: 6242, 10,000, 10,001, and 10,003. ; Mode of access: Internet.

Abstract
A plant can be thought of as a colony comprising numerous growth buds, each developing to its own rhythm. Such lack of synchrony impedes efforts to describe core principles of plant morphogenesis, dissect the underlying mechanisms, and identify regulators. Here, we use the minimalist known angiosperm to overcome this challenge and provide a model system for plant morphogenesis. We present a detailed morphological description of the monocot Wolffia australiana, as well as high-quality genome information. Further, we developed the plant-on-chip culture system and demonstrate the application of advanced technologies such as single-nucleus RNA-sequencing, protein structure prediction, and gene editing. We provide proof-of-concept examples that illustrate how W. australiana can decipher the core regulatory mechanisms of plant morphogenesis.

Parasitic weeds pose severe constraint on major agricultural crops. Varying levels of resistance have been identified and exploited in the breeding programmes of several crops. However, the level of protection achieved to date is either incomplete or ephemeral. Resistance is mainly determined by the coexistence of several mechanisms controlled by multigenic and quantitative systems. Efficient control of the parasite requires a better understanding of the interaction and their associated resistance mechanisms at the histological, genetic and molecular levels. Application of postgenomic technologies and the use of model plants should improve the understanding of the plant–parasitic plant interaction and drive not only breeding programmes through either marker-assisted selection (MAS) or transgenesis but also the development of alternative methods to control the parasite. This review presents the current approaches targeting the characterization of resistance mechanisms and explores their potentiality to control parasitic plants. ; Our work in this area is supported by Spanish CICYT project AGL-2005–01781 and European Union project FP6-2002-FOOD-1-506223. ; Peer reviewed

After the 2001 attacks on the World Trade Centre, landscape architects in North America have been called on to design public landscapes that are not only more secure but also aesthetically pleasing. In this article, the author explores the cultural and political implications of certain plant-based design strategies drawn from the Crime Prevention Through Environmental Design movement—in particular those that facilitate visual surveillance of public landscapes. Taking a broadly socio-semiotic approach, the author attempts to use a consideration of the way particular techniques work, socially and practically speaking, to reveal forms of significance that would not otherwise be apparent. The author concludes with a brief analysis of the winning design for the new American Embassy in London, as an example of a landscape attempting to be both environmentally friendly and secure.

L'étude du regard des praticiens sur les pratiques sociales fait depuis un certain nombre d'années l'objet de recherches théoriques ou pratiques reliées à diverses problématiques. Toutefois, le point de vue des praticiens à l'égard des pratiques dans les situations d'exposition à la violence conjugale est encore méconnu. À la suite du survol sociohistorique et à la présentation de l'état actuel des connaissances liées aux pratiques sociales dans ces situations, nous proposons une réflexion sur l'intégration du sens que les praticiens donnent à leur pratique dans une démarche de renouvellement démocratique des pratiques.

Whole-genome duplications (WGDs) or polyploidy events have been studied extensively in plants. In a now widely cited paper, Jiao et al. presented evidence for two ancient, ancestral plant WGDs predating the origin of flowering and seed plants, respectively. This finding was based primarily on a bimodal age distribution of gene duplication events obtained from molecular dating of almost 800 phylogenetic gene trees. We reanalyzed the phylogenomic data of Jiao et al. and found that the strong bimodality of the age distribution may be the result of technical and methodological issues and may hence not be a "true" signal of two WGD events. By using a state-of-the-art molecular dating algorithm, we demonstrate that the reported bimodal age distribution is not robust and should be interpreted with caution. Thus, there exists little evidence for two ancient WGDs in plants from phylogenomic dating. ; Y.V.d.P. acknowledges the Multidisciplinary Research Partnership "Bioinformatics: From nucleotides to networks" Project (no. 01MR0310W) of Ghent University and funding from the European Union Seventh Framework Programme (FP7/2007- 2013) under European Research Council advanced grant agreement 322739–DOUBLEUP. S.P. was funded by a R@MAP Professorship at University of Melbourne and an Australian Research Council FT grant (FT160100218). ; http://advances.sciencemag.org ; am2017 ; Genetics