Gravi- and Chemotropisms of the Primary Maize Roots when Affected by Lead and Cadmium

Gravi- and Chemotropisms of the Primary Maize Roots when Affected by Lead and Cadmium Gravity-imposed growth orientation was studied in the roots of three-day-old maize seedlings treated for 3 h with 10–5to 10–2-M lead and cadmium nitrate solutions. Cubic agar blocks (1 mm3) containing lead and cadmium nitrate solutions were used to produce unilateral local chemostimulation of roots. Gravistimulation was induced when roots were in the horizontal position or slightly deviated from the initial vertical position at the beginning of chemotropic curvature response. Positive (towards the salt) and negative (away from the salt) chemotropic curvatures were observed most often when meristems of the initially vertical roots were chemostimulated. Negative curvatures were observed most often in response to medium salt concentrations, whereas high concentrations resulted in positive curvatures. Half of the roots with their meristems stimulated by salt solutions still continued growing vertically downward. Most roots exposed to simultaneous gravi- and chemostimulation and exposed to gravistimulation after salt treatment (except at the highest salt concentration) curved downward. It follows that the final growth orientation of these roots depended mostly on gravity. The author concludes that the primary roots of maize seedlings possess high gravitropic and low chemotropic sensitivity. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Gravi- and Chemotropisms of the Primary Maize Roots when Affected by Lead and Cadmium

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Publisher
Springer Journals
Copyright
Copyright © 2001 by MAIK “Nauka/Interperiodica”
Subject
Life Sciences; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1023/A:1009082011029
Publisher site
See Article on Publisher Site

Abstract

Gravity-imposed growth orientation was studied in the roots of three-day-old maize seedlings treated for 3 h with 10–5to 10–2-M lead and cadmium nitrate solutions. Cubic agar blocks (1 mm3) containing lead and cadmium nitrate solutions were used to produce unilateral local chemostimulation of roots. Gravistimulation was induced when roots were in the horizontal position or slightly deviated from the initial vertical position at the beginning of chemotropic curvature response. Positive (towards the salt) and negative (away from the salt) chemotropic curvatures were observed most often when meristems of the initially vertical roots were chemostimulated. Negative curvatures were observed most often in response to medium salt concentrations, whereas high concentrations resulted in positive curvatures. Half of the roots with their meristems stimulated by salt solutions still continued growing vertically downward. Most roots exposed to simultaneous gravi- and chemostimulation and exposed to gravistimulation after salt treatment (except at the highest salt concentration) curved downward. It follows that the final growth orientation of these roots depended mostly on gravity. The author concludes that the primary roots of maize seedlings possess high gravitropic and low chemotropic sensitivity.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Oct 10, 2004

References

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