Effects of Mechanical Impedance on Root Growth in Barley,Hordeum vulgareL.

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Abstract
Anatomical changes induced in the roots of barley plants (Hordeum vulgare cv. Proctor) by an applied pressure of 2 × 104 Pa (0.2 bar) have been examined; previous studies had shown that the length of roots grown under these conditions was about 50% of that of unimpeded roots. Cryomicrotomy/light microscopy and scanning electron microscopy were used. Mechanical impedance increased the diameter of roots, this being due largely to an increased thickness of the cortex; the number of cells in transverse section was increased and the diameter of the outer cells was greater though that of the inner ones was reduced.

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