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Found Pollen 42 times.

Displaying results 1 to 10.

1. Allergen
Something which can cause an allergic reaction. For example, ragweed pollen is the allergen which causes hay fever.

2. Allergy
A harmful immune reaction, either immediate-type or delayed-type hypersensitivity caused by a foreign antigen (i.e. allergen ) in food, pollen, or chemicals. In most cases the cause of the allergy is otherwise harmless to the body.

3. Angiosperms
Flowering plants. first appearing at least 110 million years ago from an unknown gymnosperm ancestor, flowering plants have risen to dominance in most of the world's floras. The male gametophyte is 2-3 cells contained within a pollen grain; the female gametophyte is usually eight cells contained within an ovule which is retained on the sporophyte phase of the plant's life cycle.

4. Anther
The pollen -producing producing part of a flower.

5. Anther culture
A plant culturing technique in which immature pollen is made to divide and grow into tissue (either callus or embryonic tissue) in either a liquid medium or on solid media. pollen-containing anther s are removed from a flower and put in a culture medium; some microspheres survive and develop into tissue. If embryonic tissue develops, it's put in a medium favorable for shoot and root development; if it's callus tissue, it's put in a solution of hormones that will spur it to differentiate and develop shoot and root tissue.

6. Anther
The top of a stamen's filament; divided into pollen sacs in which the pollen grains form.

7. Autogamy
Self-fertilization, pollination of a flower by its own pollen.

8. Caudicle
A thread to which a pollen mass is attached.

9. Colporate
Of a pollen grain, having both an elongated and a rounded aperture. Compare porate .

10. Double fertilization
A characteristic of angiosperms in which a pollen tube carries two sperm cells to the female gametophyte in the ovule . One sperm cell fuses with the egg cell and gives rise to a diploid embryo The other sperm cell fuses with the two polar cells to form a triploid cell that develops into the endosperm .

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