Journalartikel

Jahr der Veröffentlichung: 1987

Seiten: 131-138

Zeitschrift: Planta

Bandnummer: 172

Heftnummer: 1

ISSN: 0032-0935

DOI Link: https://doi.org/10.1007/BF00403039

Verlag: Springer

Abstract: 

The effects of far-red light given against a background of white light
on the stem-extension kinetics of three-week-old, light-grown Chenopodium album
seedlings were investigated. Under white light alone, the stems
(cotyledon-to-apex) extended almost exactly logarithmically with time.
Under these conditions the increase in log [stem length in mm] per hour
was approx. 3.7·10^-3, equivalent to about 1% per h during
both skoto-and photoperiods. Supplementary far-red given throughout each
photoperiod massively stimulated extension. The calculated logarithmic
extension rate, however, slowly returned to that of the controls,
following an initial large increase. This is predicted by a model in
which far-red light linearly increases the extension rate of individual
internodes which arise at an exponentially increasing rate. The
behaviour of the model is also consistent with critical experiments in
which far-red was given as a pre-treatment or transiently, as well as
with other published data. Far-red stimulation of logarithmic extension
rate in successive photoperiods was closely and linearly correlated with
calculated phytochrome photoequilibrium. Daily short periods of
supplementary far-red were especially potent in accelerating extension;
the plants seemed least responsive at the end of the photoperiod.

Harvard-Zitierstil: Hughes, J. and Wagner, E. (1987) Photomorphogenesis in Chenopodium album. Effects of supplementary far-red light on the kinetics of stem extension, Planta, 172(1), pp. 131-138. https://doi.org/10.1007/BF00403039

APA-Zitierstil: Hughes, J., & Wagner, E. (1987). Photomorphogenesis in Chenopodium album. Effects of supplementary far-red light on the kinetics of stem extension. Planta. 172(1), 131-138. https://doi.org/10.1007/BF00403039