Keeping An Open Channel

Red Aphids on a Cup Plant

In plants, most sugar is transported in the phloem passing through units stacked the length of the plant called sieve tubes. Each sieve tube contains valves that can open or block flow of sugar. The valves are formed by proteins called “forisomes” that contract and block transport through the sieve tube in the presence of calcium and open when calcium concentration is low. These valves keep a plant from losing its liquid when it is cut. Cutting a plant stem…

Source: Living With Insects Blog

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