Abstract
WHITE1 has stated that secondary thickening does not occur in excised root cultures. Some of our cultures of tomato (‘Best of All') which had been kept without transfer for five to six months were recently submitted to anatomical investigation, and were found to have developed a considerable amount of secondary xylem, though the occurrence of properly differentiated secondary phloem has not yet been demonstrated. The nature and extent of the secondary xylem can be illustrated by reference to two examples.
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