Journal Article

Water Uptake and Hydraulic Properties of Elongating Cells in Hydrotropically Bending Roots of <i>Pisum sativum</i> L.

Naoko Miyamoto, Taiichiro Ookawa, Hideyuki Takahashi and Tadashi Hirasawa

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 43, issue 4, pages 393-401
Published in print April 2002 | ISSN: 0032-0781
Published online April 2002 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcf046
Water Uptake and Hydraulic Properties of Elongating Cells in Hydrotropically Bending Roots of Pisum sativum L.

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  • Biochemistry
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The water potential and hydraulic conductivity (Lp) of elongating cells in hydrotropically bending roots of the ageotropic mutant ageotropum of pea (Pisum sativum L.) were measured in situ. When agar blocks with water potentials of –0.03 and –0.8 MPa were unilaterally applied directly to a root tip, cells in the most rapidly elongating zone, 3–4 mm from the tip, showed marked differential growth. The rate of water uptake by a cell on the side treated with an agar block with a lower water potential was significantly larger in the outer first and second layers of cortex than on the other side. There were no differences in the values of turgor pressure, osmotic potential and calculated water potential between the two sides either in elongating or in mature cells, indicating the absence of any difference in the growth-induced water potential on the two sides of the root. Lp was significantly larger on the side with the agar block with lower water potential. The results suggest that the difference in the rate of water uptake during the differential cell growth that occurs during root hydrotropism might be induced mainly by a change in Lp.

Keywords: Key words: Cell elongation — Hydraulic conductivity — Hydrotropism — Pisum sativum L. — Water uptake.

Journal Article.  6523 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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