title: Elongation responses of the oat shoot to blue light, as measured by capacitance auxanometry.
abstract: An auxanometer based on capacitance micrometry is described. It does not require light or contact with the plant, and will detect changes in length of the Avena coleoptile of 1 micrometer in 3 to 5 seconds. The field employed, 1 kilohertz at a gradient of 5 volts per centimeter, does not affect the growth rate of the coleoptile. Vertical illumination with blue light at fluences of 1 to 50 ergs.cm(-2) cause an accelerated rate of coleoptile extension, beginning within 10 min after exposure. At higher exposures, the previously described growth inhibition becomes dominant.
authors: Division of Biological and Medical Research, Argonne National Laboratory, Argonne, Illinois 60439.
authors: S A
authors: SA
authors: Gordon
authors: W A
authors: WA
authors: Dobra