DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY. DR JEREMY BURGESS / SCIENCE PHOTO LIBRARY.
Scanning electron micrograph of starch grains, or amyloplasts (6 large grey bodies), in a cell of a cotyledon (seed leaf), of a mature Jack bean, Canavalia ensiformis. Bean cotyledons are storage organs in the seed containing reserves of starch, from which the germinating seed draws nourishment. Beans (legumes) are a source of protein in the human diet. The protein is stored in small vacuoles called protein bodies (tiny grey ovals, plus 3 larger ones). Beans also contain the highly poisonous lectin, concanavalin A, which if not neutralized by soaking & adequate boiling causes clotting of red blood cells. Mag: X1200 (at 10x8 size).
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