Anatomy of Normal and Acid-Injured Cotton Roots

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Abstract
Conspicuous proliferations, which developed on cotton roots as a result of cultivation in a highly acid soil, were found to arise from division of the ray cells in both xylem and phloem, and from a stimulation of the cambium and phellogen. The original phloem may be killed and become functionless. New phloem is produced which may contain the same elements, though in varying proportions. The proliferated cells are generally thin-walled parenchyma cells varying somewhat in size and form. Tyloses were present in both cases, but seem not to be related to acid injury.

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