Results 131 to 140 of about 1,446 (175)

On the rarity of dioecy in flowering plants

Molecular Ecology, 2017
Abstract Dioecy, the coexistence of separate male and female individuals in a population, is a rare but phylogenetically widespread sexual system in flowering plants. While research has concentrated on why and how dioecy evolves from hermaphroditism, the question of why dioecy is rare, despite repeated transitions to it, has received ...
John Pannell, Jos Käfer, Gabriel Marais   +2 more
exaly   +4 more sources

Androdioecy and the evolution of dioecy

Biological Journal of the Linnean Society, 1984
The likelihood that dioecy could evolve via androdioecy is examined. It is concluded that female-sterility mutations are unlikely to be able to invade populations of self-compatible hermaphrodite species, even if the resources that an hermaphrodite devotes to seed production can be diverted to yield increased survival and also to increase male ...
Deborah Charlesworth, Charlesworth D
exaly   +2 more sources

Origins of Dioecy in the Hawaiian Flora

Ecology, 1995
Because of its presumed high levels of dioecy (separate male and female plants), study of the native Hawaiian angiosperm flora has been important in development of many hypotheses about conditions favoring the evolution of dioecy. The importance of ecological correlates with dioecy has proven difficult to assess, however, because of lack of data on the
Warren Wagner, Ann K Sakai
exaly   +2 more sources

RECURRENT EVOLUTION OF DIOECY IN BRYOPHYTES

Evolution, 2012
The origin and maintenance of separate sexes (dioecy) is an enduring evolutionary puzzle. Although both hermaphroditism and dioecy occur in many diverse clades, we know little about the long-term evolutionary consequences of changing sexual system. Here we find evidence for at least 133 transitions between sexual systems in mosses, representing an ...
Stuart F, McDaniel, John, Atwood, J Gordon, Burleigh   +2 more
openaire   +2 more sources

Cryptic dioecy in flowering plants

Trends in Ecology & Evolution, 1991
In some dioecious plant species, mates and/or females have large and presumably costly opposite-sex structures that are sterile. This is termed 'cryptic dioecy'. Several new cases of cryptic dioecy have recently been studied. They may give information about the minimal requirements for the evolution of separate sexes from hermaphroditism, because the ...
S S, Mayer, D, Charlesworth
openaire   +2 more sources

Diversification, dioecy and dimorphism in schistosomes

Trends in Parasitology, 2006
In addition to causing one of the great neglected diseases of the world, schistosomes have unusual biological features that further command attention, including their habit of living in the blood of their hosts and the presence of separate, dimorphic sexes.
Eric S, Loker, Sara V, Brant
openaire   +2 more sources

Hypotheses for the evolution of dioecy in seed plants

Trends in Ecology & Evolution, 1990
Over the last decade, new hypotheses have been proposed for the evolution of dioecy in plants. Most of the selective mechanisms invoked have been suggested and supported by phylogenetic correlations. Here we review (1) the validity of the correlations (especially in light of recent critiques of the comparative method), and (2) the conformity of the ...
J D, Thomson, J, Brunet
openaire   +2 more sources

Synchronized dichogamy and dioecy in neotropicalLauraceae

Plant Systematics and Evolution, 1984
In hermaphrodite neotropicalLauraceae a highly evolved dichogamous system is present which represents a kind of temporal dioecy. This system involves the existence of two flower morphs which are characterized by reciprocal phases of receptivity of the stigmas and pollen release.
Klaus Kubitzki, Holger Kurz
openaire   +1 more source

Evolution of Dioecy in Saurauia (Dilleniaceae)

Annals of the Missouri Botanical Garden, 1984
Saurauia veraguensis in Costa Rica is morphologically androdioecious but functionally dioecious. Both staminate and pistillate flowers bear pollen. The pollen in the staminate flowers is tricolporate, and smaller than the inaperturate pollen borne by the pistillate flowers.
W. A. Haber, K. S. Bawa
openaire   +1 more source

Dioecy inMikania (Compositae:Eupatorieae)

Plant Systematics and Evolution, 1991
For the first time dioecy inMikania and in the tribeEupatorieae is described and discussed. The condition is known only in members of theMikania swartziana Griseb. complex, a group of eight species, all endemic to the Greater Antillean Islands of Cuba, Hispaniola, and Jamaica.
openaire   +1 more source