Sea slugs have a unique way of utilising sunlight
Chloroplasts are the distant descendants of photosynthetic bacteria that became symbiotic, a bit less than 2bn years ago, with an organism ancestral to today’s algae and plants. From their hosts’ point of view, their purpose is to use energy from sunlight to split water into hydrogen and oxygen, and then react the hydrogen with carbon dioxide to form molecular precursors of glucose. Further reactions turn these basic materials into other biochemicals, too.
Having thus treated their slugs, the team exposed half of them to light for 36 continuous hours and kept the other half in the dark. As they expected, they saw the unusual isotopes of carbon and nitrogen enter the chloroplasts of slugs exposed to light. By contrast, little of the heavy nitrogen and none of the heavy carbon entered the chloroplasts of slugs kept in the dark. What intrigued them, though, was the subsequent fate of those isotopes.
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