Germinated seed,SEM

Bildnummer 11539745
Germinated seed,SEM
Germinated seed. Image 4 of 4. Coloured scanning electron micrograph (SEM) of the final stage in the germination of a plant seed. The seed coat (testa) has been lost. The embryonic plant that emerged has two main parts. The radicle (white),the embryonic root,is growing downwards in a response to gravity that is called geotropism. The root 'hairs' increase the ability of the root to obtain water and nutrients from its surroundings. The embryonic shoot (plumule) will grow upwards against gravity to the light,and its seed leaves (cotyledons,green) will photosynthesise. This is a swede (Brassica napus) seedling. For images of seed germination,see B787/394-397 and B787/398
Lizenzart: Lizenzpflichtig
Credit: Science Photo Library / Power And Syred
Bildgröße: 2625 px × 3500 px
Modell-Rechte: nicht erforderlich
Eigentums-Rechte: nicht erforderlich
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