Morning Glory pollen. Coloured scanning electron micrograph of a pollen grain of the Morning Glory plant,Ipomoea learii. The grain has a highly sculpted outer wall (exine) with crater-like germinal pores surrounded by spine-covered ridges. The spines enable the pollen to adhere to the body hairs of insects & so be transferred to other flowers. When the pollen grain,containing male gametes,lands on the stigma of a flower,it germinates. A pollen tube grows out of one of the pores,down through the stigma,to the ovary. The male nuclei pass down the tube,fertilize the ovules and a seed is formed. Magnification: x310 at 6x7cm size. x1030 at 10x8ins | |
Licence : | Droits gérés |
Crédit: | Science Photo Library |
Taille de l’image : | 3780 px × 4997 px |
Model Release : | Non requis |
Property Release : | Non requis |
Restrictions : | - |