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A Comparative Study of Developing Epidermal Cells in White Mustard and Tomato Roots

R. G. H. Cormack
American Journal of Botany
Vol. 34, No. 6 (Jun., 1947), pp. 310-314
Stable URL: http://www.jstor.org/stable/2437142
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
A Comparative Study of Developing Epidermal Cells in White Mustard and Tomato Roots
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Abstract

A comparative study of serial transverse sections of white mustard and tomato roots has revealed marked differences in internal structure. These differences involve: differentiation of the epidermis; arrangement of cortical cells; time of origin, size, shape and extent of intercellular spaces; and duration of root cap tissue. In white mustard roots the differentiation of the epidermis into short and long cells is discussed from the standpoint of differences in cell position as related to radiating rows of intercellular spaces, through which and across the narrow intervening walls of which food materials may move to the outside. The same argument is used to explain differences between the epidermis of white mustard roots and that of tomato roots and to explain the greater persistence of root cap tissue in the former. The conclusions reached in the present investigation, although based on observations made of two rather extreme types of roots, appear to be valid for corn roots and may also prove to be valid for the roots of other plants.

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