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Root nodule
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Root nodule
Root nodule. Coloured scanning electron micrograph (SEM) of a root nodule on a pea plant (Pisum sativum) caused by the nitrogen-fixing soil bacteria Rhizobium leguminosarum. The plant and the bacteria have a symbiotic relationship. The bacteria converts (fixes) atmospheric nitrogen in the soil to ammonia. The plant cannot carry out this process itself, but it is vital for the production of amino acids, the building blocks of proteins. In return the plant passes carbohydrates produced during photosynthesis to the bacteria for use as an energy source. The bacteria enters the plant through its root hairs, where an infection thread leads it to the nodule. Magnification: x120 when printed 10 centimetres wide
Science Photo Library features Science and Medical images including photos and illustrations
Media ID 6292747
© DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY
Agricultural Agriculture Ammonia Bacteria Bacterium Cortex False Colour Legume Leguminous Nodule Pisum Sativum Root Spongy Symbiont Symbiosis Symbiotic False Coloured Micro Biology Microbiological
EDITORS COMMENTS
This print showcases a root nodule on a vibrant pea plant, revealing the intricate symbiotic relationship between the plant and nitrogen-fixing soil bacteria. The image, captured using a scanning electron microscope, highlights the importance of this partnership in agricultural and biological contexts. The root nodule is caused by Rhizobium leguminosarum, a bacterium that converts atmospheric nitrogen into ammonia. This process is crucial for the production of amino acids, which serve as the fundamental building blocks of proteins. While plants are unable to carry out this conversion themselves, they rely on these bacteria to fulfill their nutritional needs. In return for its services, the pea plant provides carbohydrates produced during photosynthesis to fuel the energy requirements of Rhizobium leguminosarum. The bacteria enters through specialized structures called root hairs and follows an infection thread leading it directly into the nodule. At a magnification of x120 when printed at 10 centimeters wide, this false-colored micrograph reveals fascinating details within the cortex of both organisms involved in this mutualistic association. It offers valuable insights into microbiological processes occurring beneath our feet and underscores how nature has evolved intricate mechanisms for survival and growth. This mesmerizing print from Science Photo Library serves as a testament to the wonders of botany and biology while emphasizing humanity's reliance on symbiotic relationships within our ecosystem.
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