Flower Fertilization Is an Exercise in Precision - New York Times
22 May 2012, 3:18 pm
Flower fertilization is a complex process that requires a perfect union between a single ovule and a single pollen tube, which contains sperm. Now a new study reports how flowers are able to reproduce with such expert precision. Researchers ...

That Stinks! Corpse Flower Set to Bloom Again - LiveScience.com
22 May 2012, 11:57 am
"We obtained them as seed, and since then, we have been growing them," Hillyer said. "One of Wisconsin's Titans, Big Bucky, was the ovule donor, and the pollen donor was Mr. Magnificent from the Marie Selby Botanical Garden in Sarasota, Florida."

Jewish shrines for David - OneNewsNow
21 May 2012, 3:33 pm
That would involve finding a structure, an ovule, with a reward such as nectar or pollen, and the insect with its mouth parts preserved inside that structure. That has yet to be found in the fossil record. So, we must build a circumstantial case that ...

Master Gardeners: April showers bring flowers and pollinators - Marin Independent Journal
19 May 2012, 10:13 am
The top of the pistil is called the stigma, and is often sticky. Seeds are produced at the base of the pistil, in the ovule. To be pollinated, pollen must be moved from a stamen or male part to the stigma of the female part. After this occurs ...

Pollination: Flowers are masters of reproduction - Earthtimes
18 May 2012, 10:07 am
When the gametes and sperm fuse, the signals that attract the tubes to ovule stops, discovered study author Kristin Beale, a Browns graduate student who works alongside Mark Johnson. Previous studies believed that if one pollen tube was used, others were ...

Flowers Count Pollen - Scientist
18 May 2012, 8:27 am
When pollen grains alight on a pistil (female reproductive organ), they grow tubes that burrow toward the egg, following attractants released from the flower’s ovule. Researchers at Brown University used fluorescent pollen to examine the ...

Picky Flowers Let Just Enough Pollen In - LiveScience.com
17 May 2012, 3:31 pm
The new study found that flowers have evolved an elegant safeguard system to ensure that only the minimum necessary number of pollen tubes will reach each ovule, making sure their eggs don't get doubled over with sperm. "There is a mechanism that prevents ...

Pollination with precision: How flowers do it - phys.org
17 May 2012, 3:31 pm
With hundreds of pollen grains growing long tubes to ovules to deliver their sperm to female gametes, how can a flower ensure that exactly two fertile sperm reach every ovule? In a new study, Brown University biologists report the discovery of ...

Plants Pollinate Precisely Despite Prolific Pollen - The Epoch Times
17 May 2012, 10:52 am
Flowers have a safeguard system that ensures the optimal number of pollen tubes reach each ovule for seed production, according to a new U.S. study from Brown University. When pollen grains stick to the flower’s central stigma, they send tubes for ...

Amber preserves insect pollen carriers - BBC News
15 May 2012, 7:33 am
"That would involve finding a structure, an ovule, with a reward such as nectar or pollen, and the insect with its mouth parts preserved inside that structure. That has yet to be found in the fossil record. "So, we must build a circumstantial case that ...