In research published today scientists at the John Innes Centre (JIC), Norwich(1), report on what plants do during the hours of darkness. During daylight hours plants use the energy from sunlight to power the production of food (sugar) from carbon dioxide and water. This process (photosynthesis) is well understood, but what happens when the sun goes down? The JIC researchers have found a previously unknown sugar transport system within plants and this has, for the first time, shed light on what plants do in the darkness. Their research is published in two related papers in international science journals ‘Science’ and ‘The Plant Journal’(2).
That plants use energy from sunlight to power the production of sugar from carbon dioxide and water is familiar to many people. Photosynthesis is a hugely important process because it sustains most of the food chains on the planet as well as recycling carbon dioxide and producing oxygen. Worldwide, plants use solar energy to capture millions of tonnes of carbon dioxide every day. They convert it first to sugar and then to carbohydrate, fat and protein – some of which we harvest for food.
”Photosynthesis is well understood, but our discovery is really exciting because it gives us a new insight into how plants control the use of the sugar that they produce” said Professor Alison Smith (Head of the Metabolic Biology Department and leader of the research team at the JIC). “We already know that sugar is the starting point for all of the processes of plant growth and development, but our work shows how plants ensure that even in the darkness of long winter nights, they have sufficient sugar to meet their needs”.
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