نتایج جستجو برای: angiosperms

تعداد نتایج: 5280  

Journal: :Science 1999
S Mathews M J Donoghue

An analysis of duplicate phytochrome genes (PHYA and PHYC) is used to root the angiosperms, thereby avoiding the inclusion of highly diverged outgroup sequences. The results unambiguously place the root near Amborella (one species, New Caledonia) and resolve water lilies (Nymphaeales, approximately 70 species, cosmopolitan), followed by Austrobaileya (one species, Australia), as early branches....

Journal: :Plant science : an international journal of experimental plant biology 2012
Daniel M Johnson Katherine A McCulloh David R Woodruff Frederick C Meinzer

Angiosperm and coniferous tree species utilize a continuum of hydraulic strategies. Hydraulic safety margins (defined as differences between naturally occurring xylem pressures and pressures that would cause hydraulic dysfunction, or differences between pressures resulting in loss of hydraulic function in adjacent organs (e.g., stems vs. leaves) tend to be much greater in conifers than angiospe...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2009
Duane D McKenna Andrea S Sequeira Adriana E Marvaldi Brian D Farrell

The extraordinary diversity of herbivorous beetles is usually attributed to coevolution with angiosperms. However, the degree and nature of contemporaneity in beetle and angiosperm diversification remain unclear. Here we present a large-scale molecular phylogeny for weevils (herbivorous beetles in the superfamily Curculionoidea), one of the most diverse lineages of insects, based on approximate...

Journal: :Annals of botany 2007
Robert E Carey Daniel J Cosgrove

BACKGROUND AND AIMS Expansins are plant cell wall loosening proteins important in a variety of physiological processes. They comprise a large superfamily of genes consisting of four families (EXPA, EXPB, EXLA and EXLB) whose evolutionary relationships have been well characterized in angiosperms, but not in basal land plants. This work attempts to connect the expansin superfamily in bryophytes w...

Journal: :Systematic biology 2015
V V Goremykin S V Nikiforova D Cavalieri M Pindo Peter Lockhart

Support for Amborella as the sole survivor of an evolutionary lineage that is sister to all other angiosperms comes from positions in DNA multiple-sequence alignments that have a poor fit to time-reversible substitution models. These sites exhibit significant levels of homoplasy, compositional heterogeneity, and strong heterotachy. We report phylogenetic analyses with observed, randomized, and ...

Journal: :American journal of botany 2011
Peter K Endress

Angiosperms and their flowers have greatly diversified into an overwhelming array of forms in the past 135 million years. Diversification was shaped by changes in climate and the biological environment (vegetation, interaction with other organisms) and by internal structural constraints and potentials. This review focuses on the development and structural diversity of flowers and structural con...

Journal: :The New phytologist 2012
R Geeta Liliana M Dávalos André Levy Lynn Bohs Mathew Lavin Klaus Mummenhoff Neelima Sinha Martin F Wojciechowski

• A wide range of factors (developmental, physiological, ecological) with unpredictable interactions control variation in leaf form. Here, we examined the distribution of leaf morphologies (simple and complex forms) across angiosperms in a phylogenetic context to detect patterns in the directions of changes in leaf shape. • Seven datasets (diverse angiosperms and six nested clades, Sapindales, ...

Journal: :The Journal of heredity 2005
L M Zahn J Leebens-Mack C W DePamphilis H Ma G Theissen

DEFICIENS (DEF) and GLOBOSA (GLO) function in petal and stamen organ identity in Antirrhinum and are orthologs of APETALA3 and PISTILLATA in Arabidopsis. These genes are known as B-function genes for their role in the ABC genetic model of floral organ identity. Phylogenetic analyses show that DEF and GLO are closely related paralogs, having originated from a gene duplication event after the sep...

Journal: :Molecular biology and evolution 2009
Judith Nardmann Pascal Reisewitz Wolfgang Werr

The morphologically diverse bodies of seed plants comprising gymnosperms and angiosperms, which separated some 350 Ma, grow by the activity of meristems containing stem cell niches. In the dicot model Arabidopsis thaliana, these are maintained by the stem cell-promoting functions of WUS and WUSCHEL-related homeobox 5 (WOX5) in the shoot and the root, respectively. Both genes are members of the ...

2015
Lu Ma Andrea Hatlen Laura J. Kelly Hannes Becher Wencai Wang Ales Kovarik Ilia J. Leitch Andrew R. Leitch

The RNA-directed DNA methylation (RdDM) pathway can be divided into three phases: 1) small interfering RNA biogenesis, 2) de novo methylation, and 3) chromatin modification. To determine the degree of conservation of this pathway we searched for key genes among land plants. We used OrthoMCL and the OrthoMCL Viridiplantae database to analyze proteomes of species in bryophytes, lycophytes, monilo...

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