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Hydrotropism in roots: sensing of a gradient in water potential by the root cap

โœ Scribed by Mamoru Takano; Hideyuki Takahashi; Tadashi Hirasawa; Hiroshi Suge

Publisher
Springer-Verlag
Year
1995
Tongue
English
Weight
782 KB
Volume
197
Category
Article
ISSN
0032-0935

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โœฆ Synopsis

Roots of the agravitropic pea (Pisum sativum L.) mutant, ageotropum, responded to a gradient in water potential as small as 0.5 MPa by growing toward the higher water potential. This positive response occurred when a sorbitol-containing agar block was unilaterally applied to the root cap but not when applied to the elongation region. Unilateral application of higher concentrations of sorbitol to the elongation region caused root curvature toward the sorbitol source, presumably because of growth reduction on the water-stressed side. The control blocks of plain agar applied to either the root cap or the elongation region did not cause significant curvature of the roots. These results demonstrate that hydrotropism in roots occurs following perception of a gradient in water potential by the root cap.

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โœ M. E. Westgate; J. S. Boyer ๐Ÿ“‚ Article ๐Ÿ“… 1985 ๐Ÿ› Springer-Verlag ๐ŸŒ English โš– 979 KB

The expansion growth of plant organs is inhibited at low water potentials (~w), but the inhibition has not been compared in different organs of the same plant. Therefore, we determined elongation rates of the roots, stems, leaves, and styles (silks) of maize (Zea mays L.) as soil water was depleted.