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Protein behind autumn color splendor identified

In September the chlorophyll starts to disappear from the leaves of plants. This reveals the yellow and red pigments that bring us the explosion of colors we now have in store. A research team at Ume's Plant Science Center (UPSC) has now identified a protein that helps bring out the color splendor of plants in the fall.

The research team's findings are being published in the scientific journal PNAS, Proceedings of the National Academy of Sciences.

The different pigments in a leaf are bound to different proteins. Most of the chlorophyll, which lends plants their green color, is bound to a protein called LHCII. Every individual protein is incredibly small (nearly a million times smaller than the human eye can perceive), but it is possible see them if there are many of them together. LHCII is probably the most commonly prevalent membrane protein on earth. There is so much of it, in fact, that it is visible from space--in satellite images of the earth the tropical and temperate forest areas are green.

In the tropics there is no autumn, but in our climate deciduous trees and other perennials lose their chlorophyll in the fall. The reason for this is that the proteins in the leaves contain amino acids that the plant needs to recycle. The leaves' proteins are therefore degraded and the amino acids are stored in the trunk, branches, and roots until next year, when they are used as building blocks for new leaves. Other proteins, so-called proteases, have the task of degrading these proteins, and there is extensive research under way in this field. For example, the 2004 Nobel Prize went to three scientists who work with proteases. Proteases are extremely important for all living organisms, but the proteases that break down chlorophyll-binding proteins are the only ones whose activities can be observed from space.

Working with the model plant mouse-ear cress (Arabidopsis thaliana), a research team at Umea Plant Science Center (UPS
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Source:Swedish Research Council


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