False-colour scanning electron micrograph (SEM) of pollen germinating on the stigma of the turnip flower,Brassica campestris. Of the many pollen grains which have lodged amongst the finger-like projections of the stigma,two have germinated & produced pollen tubes (centre right & bottom left). The pollen tube grows down inside the stigma,through the style (the column on which the stigma is supported) & enters the ovary at the base of the style; it protects & conveys two male gametes (sperm cells) to the female egg for fertilisation. Magnification: x400 at 6x4.5 cm ,x250 at 35mm size. Red,pink & green | |
Licence : | Droits gérés |
Crédit: | Science Photo Library / Burgess, Dr. Jeremy |
Taille de l’image : | 4670 px × 3780 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |