pollen grain

American  

noun

1. a single granule of pollen.

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Etymology

Origin of pollen grain

First recorded in 1825–35

Example Sentences

In the process of plant reproduction, when a pollen grain that transports male gametes lands on the stigma of another flower, it initiates the formation of a pollen tube.

From Science Daily • May 21, 2024

Normally, a pollen grain that sticks to the stigma of a flower during pollination germinates into a long tube that grows straight and unbranched through the ovary to the ovules, where fertilisation takes place.

From Science Daily • Apr. 16, 2024

Micrograph shows a pollen grain, which looks like puffed wheat.

From Textbooks • Jan. 1, 2015

Male gametes reach female gametophyte and the egg cell gamete though a pollen tube: an extension of a cell within the pollen grain.

From Textbooks • Jan. 1, 2015

Pollen was assumed to have germinated if the length of the pollen tube exceeded the diameter of the pollen grain.

From Northern Nut Growers Association Thirty-Fourth Annual Report 1943 by Northern Nut Growers Association