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Plant and Cell Physiology, 1986, Vol. 27, No. 8 1475-1487
© 1986

Article

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

Eiichi Tanimoto1 and Jun Watanabe2

1Biology Laboratory, College of General Education, Nagoya City University Mizuho-ku, Nagoya 467, Japan
2Physics Laboratory, College of General Education, Nagoya City University Mizuho-ku, Nagoya 467, Japan

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-injury 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.

(Received March 19, 1986; Accepted September 8, 1986)
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