Base of a rooted tomato cutting

Base of a rooted tomato cutting

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Credit: DR JEREMY BURGESS/SCIENCE PHOTO LIBRARY

Caption: A rooted cutting from a side shoot of a tomato plant, Solanum lycopersicum (formerly Lycopersicon esculentum), seen from below with fragments of adhering compost (brown). The picture shows the severed end of the cutting as it develops roots (white), 7 days after removal from the parent plant. The cut surface (centre, yellow hue) has grown protective callus tissue. The new roots appear as outgrowths from the stem just beyond the cut. Root formation is stimulated by the plant hormone auxin, indoleacetic acid (IAA), which is produced by the shoot tip and migrates downwards through the stem. In an intact plant, IAA regulates extension growth, but if the stem is cut, it accumulates above the cut, and stimulates the formation of new roots. Cuttings are used in horticulture to propagate a wide variety of plants. For the amateur grower, cuttings are an inexpensive way of gaining new plants.

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Keywords: auxin, callus tissue, cutting, iaa, indoleacetic acid, lycopersicon esculentum, plant hormone, plant propagation, root, root formation, solanum lycopersicum, stem cutting, tomato

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