Tag: "pollen" at biology news

Pollination find could lead to cordgrass control

The wind transports pollen far less effectively than scientists assumed, acco...rasses, oaks and pine trees need the wind to carry pollen between plants, fertilizing nascent seeds. Scientists guessed that wind pollination was efficient, b...

Droughts like 1930s Dust Bowl may have been unexceptional in prehistoric times, new study suggests

...s for charcoal evidence of the amount of fire, for pollen evidence of the kinds of grasses that were growing... Illinois State Museum in Springfield investigated pollen in the sediments. The regularity of these ancient droughts make much more recent Great Plains drough...

Research reveals role of gene in infertility

...pen because meiosis is an event that occurs before pollen development starts," Ma explains. "We then treat the cells with chemicals that protect their structure from damage and then stain them with a chemical that allows us to see the DNA much more clearly than any other part of the cell. The researchers...

Antibiotics alter GI tract microbes and increase lung sensitivity to allergens

...ensitized to the presence of ordinary mold spores, pollen or other allergens. The result is a hyperactive immune response, which can produce allergy symptoms or even asthma. To test Huffnagle's hypothesis, Mairi C. Noverr, Ph.D., a U-M research fellow in internal medicine, gave a five-day course of oral ant...

Genetic barrier to self-pollination identified

...ity, in which pollination fails to set seed if the pollen is identified as its own by the pistil. A research... the discovery of a gene of petunias that controls pollen function in self-incompatibility. This discovery completes a critical missing link in the understand...

Tests show biotech corn rules need revision

...The findings suggest measures are needed to reduce pollen spread from Bt corn to corn fields that should be ...h & Extension Center. Chilcutt questioned whether pollen from Bt corn moved into refuges when he noticed that ears of white non-Bt corn had some yellow kerne...

Domesticated tree crops may be the 'future of forestry'

...he risk of contaminating wild stands of trees with pollen from plants carrying novel genes. An answer to those critics, however, could lie within the process of gene discovery itself, Meilan said. "If we're domesticating trees, it probably won't be for their flowers; it's for the wood. And if we can propaga...

Despite confinement, crop genes can spread fast to wild

...en shown that chloroplast DNA transmission through pollen can occur at a low rate." He asks, "How much does ...include the rate of transgene leakage, the rate of pollen flow, the size of the wild population and the effects of the transgene under wild conditions. By con...

Sediment samples suggest how plants would fare in hotter, drier future

...assland change have been hampered by the fact that pollen grains of grasses cannot be separated into species, making it difficult to understand climate adaptations of C3 and C4 plants during the middle Holocene," Hu said. "This study offers a new details about grassland responses to long periods of severe d...

Plant sex protein identified at UC Riverside

...e female organs play a role in guiding sperm-laden pollen tubes to the eggs found in ovules. But until now, ...nown function, effectively guided sperm-laden lily pollen tubes to the plant's ovules, which hold the eggs from which come seeds in the lily. The protein work...

First phylogeographic study of a rainforest tree

... Symphonia globulifera also has a detailed fossil pollen record, which the authors used to calibrate a molecular clock for DNA sequences obtained from African and Neotropical populations and to estimate when these populations were separated. The study revealed that, although trees from different populatio...

Stop to smell the flowers - But do it before they're pollinated

...o down in snapdragons." When it lands on a flower, pollen produces a structure called a pollen tube. This tube burrows into the flower and makes fertilization possible by giving the pollen access...

UCR geneticist spells out consequences of genetically engineered genes escaping into wild species

...ersy is the fact that engineered genes may move by pollen flow -- and subsequent sex -- into plant populations for which they were unintended, but not one book has yet emerged that focuses on this issue," he said. For this book, Ellstrand's style and delivery were inspired by Don Levin, his major professor ...

Northern climate, ecosystems driven by cycles of changing sunlight

...s, including their composition of biogenic silica, pollen and isotopes. The new data combined with recent f...d moisture in the Alaskan tundra. The abundance of pollen from shrubs varied up to 25 percent between cycle peaks. "When there have been high aquatic producti...

Models show gene flow from crops threatens wild plants

...or of corn. As a gentle breeze blows gene-carrying pollen from a nearby crop of maize to its wild relative, ...en." Specifically, the models examine how rates of pollen flow and how the selective effects of crop genes on wild plants alter two evolutionary processes: ge...

Researchers identify molecular signaling system that is crucial for plant fertility

...ng growth of the tube that transports sperm from a pollen grain on a flower's surface to the egg cells withi...al Institute at the University of Chicago. When a pollen grain is deposited on the surface of a flower, it somehow has to grow a tube from the stigma of the ...

Researchers identify key molecular signal in plant pollination

...dance of the "pollen tube," a tunnel formed by the pollen grain that aids in fertilizing the plant's eggs. T... interacting control signals that likely guide the pollen tube on its crucial journey. In an article published in the July 11, 2003, issue of the journal Cel...

The stinky smell of success of Ted the Titan: a tale from Chemical & Engineering News

..." according to Sandoval. In so doing, they pick up pollen from the plant's male parts, deposit it on the female parts, and thus fertilize it. Besides UC Davis a handful of botanical gardens worldwide cultivate Ted. "Mr. Stinky" resides at the Fairfield Tropical Garden in Coral Gables, Fla.; "Tiny" lives at ...

Giant bloom fades, science continues

...er shoot instead, hoping to attract flies carrying pollen from another of its kind. Ted was grown from a seed planted in 1995. This was its first flowering. The plants can live for several decades but are thought to flower only every few years. The scientists may get a chance to repeat their observations. T...

Changing global nitrogen cycle impacting human health, says Colorado University-led study

...rogen can inhibit crop growth, increase allergenic pollen production and potentially affect the dynamics of several vector-borne diseases, including West Nile virus, malaria and cholera," the researchers wrote. A paper on the subject appeared in the June 2 issue of Frontiers in Ecology. The project was f...

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