Back أنبوب اللقاح Arabic Polenova cijev BS Tub pol·línic Catalan Pylová láčka Czech Pollenschlauch German Tubo polínico Spanish لوله گرده Persian Siiteputki Finnish Tube pollinique French Tubo polínico Galician

Pollen tube

SEM image of pollen tubes growing from lily pollen grains.

A pollen tube is a tubular structure produced by the male gametophyte of seed plants when it germinates. Pollen tube elongation is an integral stage in the plant life cycle. The pollen tube acts as a conduit to transport the male gamete cells from the pollen grain—either from the stigma (in flowering plants) to the ovules at the base of the pistil or directly through ovule tissue in some gymnosperms. In maize, this single cell can grow longer than 12 inches (30 cm) to traverse the length of the pistil.

Pollen tubes were first discovered by Giovanni Battista Amici in the 19th century.

They are used as a model for understanding plant cell behavior. Research is ongoing to comprehend how the pollen tube responds to extracellular guidance signals to achieve fertilization.

Bee pollinating a sunflower. Pollen is transferred from anther of one plant to stigma of another as bee collects nectar

Pollen tubes are unique to seed plants and their structures have evolved over their history since the Carboniferous period. Pollen tube formation is complex and the mechanism is not fully understood.[1]

  1. ^ Cite error: The named reference Li_2018 was invoked but never defined (see the help page).

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