Starch grains or amyloplasts, SEM

Starch grains or amyloplasts, SEM

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Caption: Scanning electron micrograph of starch grains, or amyloplasts (large grey bodies 4-6 per cell), in cells 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). Beans also contain the highly poisonous lectin, concanavalin A, which if not neutralized by soaking & adequate boiling causes clotting of red blood cells. Air spaces are visible between cells. Mag: X280 (at 10x8 size).

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Keywords: amyloplast, botanical science, botany, canavalia ensiformis, cell, cells, cotyledon, jack bean, lectin poison, plant, plant structure, plastid, plastids, protein bodies, scanning electron micrograph, seed leaf, starch grain, type

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