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Germinated seed, SEM
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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
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Media ID 9194625
© POWER AND SYRED/SCIENCE PHOTO LIBRARY
Brassica Napus Cotyledon Cotyledons Dicot Embryo Embryonic Geotropism Germinating Germination Growing Hair Hairs Late Radicle Reproduction Reproductive Root Seed Seedling Sequence Shoot Stage Swede
EDITORS COMMENTS
This print showcases the final stage of germination in a plant seed, providing a fascinating glimpse into the intricate world of botanical growth. In this coloured scanning electron micrograph (SEM), we witness the emergence of an embryonic plant after shedding its protective seed coat. The two main components that have come to life are visually striking - the radicle, or embryonic root, is depicted as a vibrant white structure growing downwards in response to gravity's pull, known as geotropism. Meanwhile, the embryonic shoot, called plumule, defies gravity by reaching upwards towards the light. Its green seed leaves, known as cotyledons, not only add a touch of color but also play a vital role in photosynthesis. This particular image features a swede (Brassica napus) seedling and highlights various aspects of its development and reproductive process. The root hairs visible on the radicle enhance its ability to extract water and nutrients from its surroundings for sustenance. As we delve deeper into this microscopic view provided by SEM technology - short for scanning electron microscope - we gain insight into how life begins and thrives within even the tiniest seeds. Science Photo Library presents this stunning visual representation of nature's wonders with meticulous attention to detail and scientific accuracy. It serves as a reminder that every living organism has its own unique journey towards growth and survival – an awe-inspiring testament to the beauty found within our natural world.
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