SOME EFFECTS OF DECAPITATION ON ELECTRICAL AND ELONGATION PHENOMENA IN THE AVENA COLEOPTILE

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Abstract
Data are presented which show the relationship between the effective auxin concn., as indexed by elongation rate, and the concurrent longitudinal electrical polarity in the coleoptile of A. sativa. Elongation was altered by the process of decapitation. To minimize mechanical stimulation during decapitation, a special mechanism was devised. A description of the mechanical decapita-tor is included. Removal of the apex from the intact plants as well as isolated sheaths results in 2 decreased but different elongation rates, which are followed by an increased elongation rate. No significant changes in the magnitude and orientation of the longitudinal electrical polarity were noted during these elongation changes. In younger coleoptiles decapitation similarly altered the rate of elongation but had no apparent effect on the inherent variation of the longitudinal electrical polarity. The results indicate that the magnitude, orientation, and characteristic variability of the longitudinal electrical polarity in the Avena coleoptile are independent of the auxin-regulated elongation process.

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