[ noun ] the fine spores that contain male gametes and that are borne by an anther in a flowering plant <noun.plant>
Pollen \Pol"len\, n. [L. pollen fine flour, fine dust; cf. Gr. ?] 1. Fine bran or flour. [Obs.] --Bailey.
2. (Bot.) The fecundating dustlike cells of the anthers of flowers. See {Flower}, and Illust. of {Filament}.
{Pollen grain} (Bot.), a particle or call of pollen.
{Pollen mass}, a pollinium. --Gray.
{Pollen sac}, a compartment of an anther containing pollen, -- usually there are four in each anther.
{Pollen tube}, a slender tube which issues from the pollen grain on its contact with the stigma, which it penetrates, thus conveying, it is supposed, the fecundating matter of the grain to the ovule.
When it came time for the TA 29 gene to be "turned on" to help make pollen, the bacterial gene was turned on, the TA 29 gene destroyed, and the plant rendered male sterile because it couldn't produce pollen.
When it came time for the TA 29 gene to be "turned on" to help make pollen, the bacterial gene was turned on, the TA 29 gene destroyed, and the plant rendered male sterile because it couldn't produce pollen.
The plant appears to reproduce as others do: pollen from the stamen fertilizes the ovaries, which turn into fruit.
Crystal Labs produces up to 1,100 pounds a year of powder from pollen, mold, animal skin, insects and food.
With all this multi-thematic flying about, the characters seem less like angels in action, more like bees dementedly sipping at every pollen source in the geo-cultural garden.
The Chlor-Trimeton Allergy Season Index has been measuring pollen counts since 1984.
Bees are needed to pollinate hybrid strains of cotton by carrying pollen from male to female plants, which produce the hybrid seed.
This means that the following day when the body comes across additional pollen there are even more mast cells to create a reaction.
The new maize variety is not yet ready for use in the United States, It was created with the Third World in mind and its pollen is spread naturally by the wind.
Those plants were then fertilized with pollen and produced a new generation of seedlings which were shown to have the same genetic traits that had been engineered into their parents.