Tip growth in a tobacco pollen tube (germinated in vitro)
Time-lapse images showing that pollen tubes grow only at the cell tip. Growth speed in vitro: about 1 - 4 micrometer per minute for Nicotiana tabacum. Cell diameter: 8 micrometer. Author: Aydn Haydar, under supervision of J. Derksen, J. Nieuwland and E. Pierson
