pollen grain


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Related to pollen grain: pollen tube

pollen grain

a small structure of higher plants that contains haploid male gamete NUCLEI and is surrounded by a double wall, the EXINE and INTINE. As the pollen grain ripens in the pollen sac of the ANTHER, the nucleus divides by MITOSIS into two nuclei which have different functions, the ‘generative’ nucleus and the ‘tube’ nucleus (see POLLEN TUBE). Pollen grains are transported from the male stamen to the female stigma in a process called POLLINATION.
References in periodicals archive ?
After entrainment, the movement of pollen within large airflow patterns is generally considered in terms of the terminal settling velocity of pollen grains (which depends on the density and the size of pollen grains) and on ambient meteorological conditions.
A small amount of pollen grains was placed on slide and 1-2 drop of 1% acetocarmine solution was added.
The present study was aimed to describe the most unique pollen found in the honey collected in protected landscapes of Lithuania and to show digital images of pollen grains found in honey.
Sometimes, pollen grains that contact the pistil are triggered to grow rapidly, not into the style but on the medium (Figure 3D, E, black arrows).
But she's a good sport about discussing whether her research suggests that tree pollen grains have their own versions of nose-punching brawls over female favor.
Cereal pollen grains in pre-elm decline deposits: implications for the earliest agriculture in Britain and Ireland.
Experiment #_____ Purpose: (For example: To test the effect of sucrose concentration on pollen grain germination) Materials and Methods: A.
Source of pollen grains and classification of Date palm variety:
Pollen grains large to very large, 49-180 [micro]m in diameter, spheroidal, and inaperturate (Table 2, Fig.
Species can be identified from pollen grains, fragments of seeds or roots, wood, faecal samples, stomach contents or environmental samples collected from the air, soil or water.
Pollen counts represent pollen grains in the air per cubic meter during the previous 24 hours.