Results 211 to 220 of about 20,537 (257)

Floral organogenesis and floral evolution of the Lecythidoideae (Lecythidaceae)

American Journal of Botany, 2007
The subfamily Lecythidoideae of Lecythidaceae (Brazil nut family) is a dominant group in neotropical forests, especially those of Amazonia. New World members of the family have large showy flowers that are either polysymmetric or monosymmetric. In this study, floral organogenesis of all 10 neotropical genera was examined using SEM.
Scott A Mori
exaly   +3 more sources

The evolution of floral gigantism

Current Opinion in Plant Biology, 2008
Flowers exhibit tremendous variation in size (>1000-fold), ranging from less than a millimeter to nearly a meter in diameter. Numerous studies have established the importance of increased floral size in species that exhibit relatively normal-sized flowers, but few studies have examined the evolution of floral size increase in species with extremely ...
Davis, C C, Endress, P K, Baum, D A
openaire   +3 more sources

Evolution of cereal floral architecture and threshability

Trends in Plant Science, 2023
Hulled grains, while providing natural protection for seeds, pose a challenge to manual threshing due to the pair of glumes tightly encasing them. Based on natural evolution and artificial domestication, gramineous crops evolved various hull-like floral organs.
Peng Xie, Yaorong Wu, Qi Xie
openaire   +2 more sources

The evolution of floral biology in basal angiosperms [PDF]

Philosophical Transactions of the Royal Society B: Biological Sciences, 2010
In basal angiosperms (including ANITA grade, magnoliids, Choranthaceae, Ceratophyllaceae) almost all bisexual flowers are dichogamous (with male and female functions more or less separated in time), and nearly 100 per cent of those are protogynous (with female function before male function).
exaly   +4 more sources

Developmental genetics of floral symmetry evolution

Trends in Plant Science, 2009
The relative importance of convergence and parallelism in the independent evolution of similar traits remains an important question in evolutionary biology. Floral zygomorphy has evolved multiple times independently in different plant lineages through alterations in size, shape and/or number of spatially defined organs. In Antirrhinum majus (snapdragon)
Jill C, Preston, Lena C, Hileman
openaire   +2 more sources

Pollinator-mediated evolution of floral signals

Trends in Ecology & Evolution, 2013
Because most plants rely on animals for pollination, insights from animal sensory ecology and behavior are essential for understanding the evolution of flowers. In this review, we compare and contrast three main types of pollinator responses to floral signals--receiver bias, 'adaptive' innate preferences, and associative learning--and discuss how they ...
Schiestl, F.P., Johnson, S.D.
openaire   +3 more sources

Zygomorphic flowers last longer: the evolution of floral symmetry and floral longevity

Biology Letters
Floral longevity, the length of time a flower remains open and functional, is a phylogenetically conserved trait that balances floral costs against the rate at which flowers are pollinated. Floral symmetry has long been considered a key trait in floral evolution.
Ruby E Stephens, Rachael V Gallagher, Marcos Méndez   +2 more
exaly   +3 more sources

Pleiotropy and the evolution of floral integration

New Phytologist, 2015
SummaryFloral traits often show correlated variation, both within and across species. One explanation for this pattern of floral integration is that different elements of floral phenotypes are controlled by the same genes, that is, that the genetic architecture is pleiotropic.
openaire   +2 more sources

The Evolution of Floral Symmetry

2010
Abstract Symmetry is a defining feature of floral diversity. Here we review the evolutionary and ecological context of floral symmetry (adding new data regarding its distribution), as well as the underlying developmental and molecular bases. Two main types of symmetry are recognized: radial symmetry or actinomorphy and bilateral symmetry or ...
Citerne, Hélène, Jabbour, Florian, Nadot, Sophie, Damerval, Catherine   +3 more
openaire   +3 more sources

Floral Evolution in the Family Gramineae

Evolution, 1961
With few exceptions the flowers of plants belonging to the family Gramineae are small and have only a rudimentary perianth. In what follows the variation in floral structure within the family is described and it is shown that most of the known floral types may be derived by reduction from an Arundinariatype flower.
openaire   +1 more source