Sentences with phrase «many angiosperms»

Chia seeds wiki that is sage hispanica, unremarkably referred to as Chia, may be a species of angiosperm within the Labiatae, Lamiaceae, native to North American nation and central and southern Guatemala.

This process starts with double fertilization in angiosperms and it involves the fusion of the egg and sperm nuclei into a zygote.

It is the product of the ripened ovule of gymnosperm and angiosperm plants which occurs after fertilization and some growth with in the motherplant.

The production of seeds distinguishes the gymnosperms and the angiosperms from other members of the vascular plants.

Plants were evolving fast during the Mesozoic, with the rise of cycads, conifers, and especially the angiosperms or flowering plants in the Cretaceous.

«This is the first time that we have a clear vision for the early evolution of flowers across all angiosperms.»

«We think the world was quite impoverished as a result of the KT event, and when the vegetation came back, angiosperms dominated.

Importantly, the Cretaceous - Paleogene extinction event played a role in major radiations of birds, mammals and angiosperms — and this work suggests that it may also have been crucial to boosting calyptrate diversification during the Cenozoic.

How exactly all the project findings — the decline of angiosperms, mollusks, and dinosaurs; the rising and falling sea; the cooling climate — fit together isn't clear yet.

But the angiosperms — the flowering plants — suffered devastating losses.»

Among the plants and trees that exist in our contemporary landscape, angiosperms include almost everything except conifers, ferns, cycads, and ginkgoes.

Along the banks of the more stable rivers stand dawn redwood, water pine, and a variety of angiosperms, whereas farther away, claiming higher, drier ground, are forests of cycads, ferns, and conifers.

In fact, the team reports in an upcoming issue of the Proceedings of the Royal Society B, there seems to be no correlation between dino diversity and the proliferation of flowering plants, and there is scant fossil evidence linking angiosperms to the dino diet.

«A large portion of the flowering plants, or angiosperms, depended on the insects for pollination, and insects were a major factor in creating the soil conditions on which the plants grew,» Wilson says.

When they corrected for this bias, they found that instead of mirroring the evolutionary expansion of angiosperms, dinosaur diversity peaked 85 million to 55 million years earlier, during the early Jurassic period.

«Tricellular pollen develops rapidly after pollination, and so it would be favored in many of the unique lifestyles of angiosperms that demand rapid reproduction, such as herbs, annuals, and herbaceous aquatics,» Williams notes.

In the 1920s it was proposed that tricellular pollen had evolved independently within angiosperms numerous times and was an irreversible state.

There are only 18 known populations of this very special angiosperm in mountainous regions New Caledonia.

While the majority of angiosperm species disperse their pollen in this early, bicellular, stage of sexual maturity, about 30 % of flowering plants disperse their pollen in a more mature fertile stage, consisting of three cells (a body and two sperm cells).

Cross-fertilization led to diversification of both plants and their insect predators, culminating in the evolution of the angiosperms.

Williams contends that these innovations took hold at least 125 million years ago and made it possible for early angiosperms to evolve more flexible and sheltered modes of fertilization, including ovaries containing egg cells deep inside the plant.

Among angiosperm species, wood density emerged as a useful predictive trait of drought survival, perhaps because trees with dense wood tend to have more armor around their xylem.

There are an estimated 270,000 known species of angiosperms, or flowering plants, but only about 900 species of gymnosperms, which are nonflowering plants such as conifers, cycads, and ginkgoes.

The angiosperm family Rubiaceae contains the highest diversity of ant plants, and the new study focused on those in the subtribe Hydnophytinae, of which some 100 species are found in southeast Asia and Australasia.

In early angiosperms, a different and much faster mechanism evolved.

«This discovery tells us that angiosperms were already in existence during the Middle Jurassic, and the distribution of the fossils demonstrates that East Asia, and especially northeastern China, is one of the original places of the angiosperms.»

«Angiosperms were not successful until they got the adaptation to drop their leaves,» said study co-author Doug Soltis, a Florida Museum distinguished professor with appointments in UF's biology department and the UF Genetics Institute.

Dogma in the field maintains that angiosperms, as flowering plants are called, evolved from shrubs that resembled modern magnolia trees.

The conifer's pores are 100 times larger than those in angiosperms and allow water to pass through relatively easily.

And that would have given the angiosperms the energy to push competitors like conifers out of the canopy around 150 million years ago, making angiosperms the most productive group of land plants in the world.

Early angiosperms had simple leaf patterns with few veins.

«The work provides the first quantitative, physiological, and phylogenetic framework for understanding why, when, and how angiosperms evolved much higher photosynthetic rates than other plants.»

The researchers wondered if the evolution of more veins per leaf gave angiosperms the boost they needed to become widespread.

But about 100 million years ago, newer species of angiosperms had doubled, tripled, and, ultimately, increased by 10-fold the number of leaf veins, the team reported online last week in Ecology Letters.

More leaf veins made the plants better photosynthesizers, the duo reports, enabling angiosperms to outgrow their competition.

The study appearing Sunday (Dec. 22) in the journal Nature and co-authored by University of Florida scientists shows many angiosperms, or flowering plants, evolved mechanisms to cope with freezing temperatures as they radiated into nearly every climate during pre-historic times.

Veins are quite sparse in Amborella (far left), an early angiosperm, but their density has increased through time, with a recently evolved legume (far right) having quite a high concentration of veins.

Angiosperm valves are simple membranes full of miniscule pores.

Angiosperms such as oaks and willows accomplish this using a series of centimeters - long, tube - shaped cellular pipes.

Thus, while England's native flora was largely scraped away by glaciers, in the Hengduans a variety of plants flourished — including angiosperms, such as the Magnoliaceae and Ranunculaceae, which originated in the Cretaceous Period.

They think these additional genes paved the way for colorful and more structured and shapely flowers in later evolving angiosperms.

We generated a high - quality draft genome of the species Coffea canephora, which displays a conserved chromosomal gene order among asterid angiosperms.

This enormous, 3.9 - megabase genome contains six genome equivalents of foreign mitochondrial DNA, acquired from green algae, mosses, and other angiosperms.

Flowering plants, also called angiosperms, arose at least 160 million years ago and quickly spread; today, they number more than 300,000 species that adorn the landscape and feed the world.

When Charles Darwin looked at the fossil record, he was amazed at how many different kinds of angiosperms evolved so quickly, calling this burst «an abominable mystery.»

Indeed, the genome comparisons revealed that angiosperms evolved 1179 novel genes, many of which gave rise to additional related genes to make up whole new gene families, says project co-leader Claude dePamphilis, an evolutionary biologist at Pennsylvania State University, University Park.

Applying biomechanical formulae to a treasure trove of thousands of fossilized leaves of angiosperms — flowering plants excluding conifers — the team was able to reconstruct the ecology of a diverse plant community thriving during a 2.2 million - year period spanning the cataclysmic impact event, believed to have wiped out more than half of plant species living at the time.

Living examples of evergreen angiosperms, such as holly and ivy, tend to prefer shade, don't grow very fast and sport dark - colored leaves.

We observed a rapid and distinct increase in plant diversity and origination rates, with a set of new taxa, mostly angiosperms, added to the existing stock of low - diversity Paleocene flora.

The researchers found evidence that after the impact, fast - growing, deciduous angiosperms had replaced their slow - growing, evergreen peers to a large extent.