Automated Recording of Lettuce Root Elongation as Affected by Auxin and Acid pH in A New Rhizometer with Minimum Mechanical Contact to Roots

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概要

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• The elongation of many lettuce roots was separately recorded at the same time by a new rhizometer with minimum mechanical contact to root tips. The apparatus was operated by a microcomputer system interfaced with field-effect transistor circuits. Elongation responses of intact seedling roots (ISR), decotylized seedling roots (DSR) and excised apical roots (EXR) to different concentrations of H^+ and IAA were compared. A pH 4-induced acid growth was observed only in DER and EXR, whereas a pH 3-induced one was observed in all roots. Duration of pH 3-induced elongation was shorter in ISR than in DSR and EXR. Growth curves suggested that ISR is more susceptible to acid-in.jury than EXR. The maximum acid growth was obtained at pH 2.5 in EXR which is comparable to thick roots of maize [Edwards and Scott (1974) Planta 119: 27]. Indole-3-acetic acid showed growth inhibition at concentrations higher than 10^<-8> M which is comparable to other reports on thick roots. It is concluded that fine lettuce roots have the same magnitude of sensitivity to external concentration of H^+ and IAA as thick roots. It is also suggested that root excision or decotylization makes roots less susceptible to acid-injury, resulting in greater acid-growth of EXR. Further characteristics and application of the new rhizometer are discussed.

• 日本植物生理学会の論文

著者

• Tanimoto E

  Nagoya City Univ. Nagoya Jpn

• Tanimoto Eiichi

  Biological Laboratory College Of General Education Nagoya City University

• Watanabe Jun

  Physics Laboratory, College of General Education, Nagoya City University

• Watanabe Jun

  Physics Laboratory College Of General Education Nagoya City University

関連論文

• Effect of GA_3 on the Molecular Mass of Polyuronides in the Cell Walls of Alaska Pea Roots
• Correlation between β-galactosidase and auxin-induced elongation growth in etiolated pea stems
• Gibberellin Regulation of Root Growth with Change in Galactose Content of Cell Walls in Pisum sativum
• Automated Recording of Lettuce Root Elongation as Affected by Auxin and Acid pH in A New Rhizometer with Minimum Mechanical Contact to Roots

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