Germinating plane tree pollen. Coloured scanning electron micrograph (SEM) of a plane tree (Platanus sp.) pollen grain that has sprouted a pollen tube (brown). Pollen contains the male sex cells of a plant. Pollen tubes are produced when a pollen grain lands on the pistil (female part) of a flower. The tube burrows down into the pistil to reach the ovaries,where it fertilises the ovum (egg cell) | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Psaila, Philippe |
Taille de l’image : | 4000 px × 3221 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |