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 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library |
Bildgröße: | 3780 px × 4997 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |