Dioecy
Mostrando 1-10 de 10 artigos, teses e dissertações.
-
1. Revisão taxonômica das espécies sul-americanas Symplocos Jacq. seção Hopea (L.) A. DC. (Symplocaceae) / A taxonomic revision of the South American species Symplocos Jacq. section Hopea (L.) A. DC. (Symplocaceae) Hypoxic stress tolerance in soybean the effect of nitrate
O presente estudo consiste de uma revisão taxonômica das espécies sul-americanas de Symplocos seção Hopea, um grupo reconhecido principalmente por apresentar flores unissexuadas (espécies dioicas) e estames e estaminódios arranjados em grupos mais ou menos alternos aos lobos da corola. No total foram reconhecidas 27 espécies da seção para o contine
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 27/07/2011
-
2. Development of Schistosoma mansoni worms in mice analyzed by bright field and confocal microscopy
The blood flukes of mammals (Digenea: Schistosomatidae) are among trematodes unique whose adult worms have separeted sexes which are dissimilar in appearance. The developmental features, growth and organogenesis of Schistosoma mansoni were studied in Swiss Webster mice by a digital system for image analysis and confocal microscopy. Data so far obtained showe
Memórias do Instituto Oswaldo Cruz. Publicado em: 2006-10
-
3. Reproductive Biology of Geonoma brevispatha Barb. Rodr. (Arecaceae) in inundable gallery forest, in Uberlândia / Biologia reprodutiva de Geonoma Brevispatha Barb. Rodr. (Arecaceae) em área de mata de galeria inundável em Uberlândia-MG
Geonoma brevispatha is a palm tree with clonal growth and restricted to flooded habitats, borders of rivers and streams. The aim of this work was to study its reproductive biology in an inundable gallery forest, in Uberlândia, MG in the period from April 2004 to December 2005. The species bloomed from April to November 2004 with larger intensity of opening
Publicado em: 2006
-
4. Reproductive Biology of Geonoma brevispatha Barb. Rodr. (Arecaceae) in inundable gallery forest, in UberlÃndia / Biologia reprodutiva de Geonoma Brevispatha Barb. Rodr. (Arecaceae) em Ãrea de mata de galeria inundÃvel em UberlÃndia-MG
Geonoma brevispatha is a palm tree with clonal growth and restricted to flooded habitats, borders of rivers and streams. The aim of this work was to study its reproductive biology in an inundable gallery forest, in UberlÃndia, MG in the period from April 2004 to December 2005. The species bloomed from April to November 2004 with larger intensity of opening
Publicado em: 2006
-
5. Dioecy and the evolution of sex ratios in ants
Split sex ratios, when some colonies produce only male and others only female reproductives, is a common feature of social insects, especially ants. The most widely accepted explanation for split sex ratios was proposed by Boomsma and Grafen, and is driven by conflicts of interest among colonies that vary in relatedness. The predictions of the Boomsma–Graf
The Royal Society.
-
6. Selection in Plant Populations of Effectively Infinite Size. V. Biallelic Models of Trioecy
A one-locus two-allele model of trioecy (presence of hermaphrodites, males and females in one population) is considered, in order to study the conditions for the persistence of this system. All possible assignments of the three sex types to the three genotypes are considered. This leads to three different modes of inheritance of trioecy, namely (a) females h
-
7. How does breeding system variation modulate sexual antagonism?
The study of sexually antagonistic (SA) traits remains largely limited to dioecious (separate sex), mobile animals. However, the occurrence of sexual conflict is restricted neither by breeding system (the mode of sexual reproduction, e.g. dioecy or hermaphroditism) nor by sessility. Here, we synthesize how variation in breeding system can affect the evolutio
The Royal Society.
-
8. Sex determination in flowering plants.
In many ways, plants offer unique systems through which to study sex determination. Because the production of unisexual flowers has evolved independently in many plant species, different and novel mechanisms may be operational. Hence, there is probably not one unifying mechanism that explains sex determination in plants. Advances in our understanding of sex
-
9. Mathematical Study of the Evolution of Gynodioecy with Cytoplasmic Inheritance under the Effect of a Nuclear Restorer Gene
A study is described of the influence of the introduction of a dominant nuclear restorer gene into a cytoplasmic gynodioecious plant population. This study includes the consideration of separate effects on the relative female fertility of nuclear, cytoplasmic and sex (phenotypic) factors. Under these assumptions, the introduction of a dominant nuclear restor
-
10. Pollination and parasitism in functionally dioecious figs.
Fig wasps (Agaonidae: Hymenoptera) are seed predators and their interactions with Ficus species (Moraceae) range from mutualism to parasitism. Recently considerable attention has been paid to conflicts of interest between the mutualists and how they are resolved in monoecious fig species. However, despite the fact that different conflicts can arise, little i