Please use this identifier to cite or link to this item: http://lib.jncasr.ac.in:8080/jspui/handle/10572/231
Title: Light-Dependent Changes in the Leaflet Movement Rhythm of the Plant Desmodium gyrans
Authors: Sharma, Vijay Kumar
Bardal, Tom Kristian
Johnsson, Anders
Keywords: ultradian rhythms
leaflets
Desmodium
Current Pulses
Motor Cells
K+
Pulvinus
Issue Date: Feb-2003
Publisher: Verlag Z Naturforsch
Citation: Zeitschrift Fur Naturforschung C-A Journal Of Biosciences 58(1-2), 81-86 (2003)
Abstract: The movements of the lateral leaflets of the Indian telegraph plant Desmodium gyrans (L. F.) DC, have earlier been studied in detail with regards to the effects of chemicals, DC currents, and static magnetic fields. In the present paper we have discussed the oscillation of the lateral leaflets under the influence of white light of various light levels (0-75 mumol . m(-2).s(-1)), produced by an array of LEDs (light emitting diodes). LEDs were used in contrast to fluorescense tubes as in earlier studies in order to minimize changes of wavelength when light intensity was decreased or increased. Furthermore, care was taken to ensure that the temperature in the experimental chamber was constant. When the oscillations were first monitored in bright light, the oscillations were found to be very rapid and with decreasing light intensity the oscillations slowed down. For light levels lower than about 20 mumol . m(-2) . s(-1) the period of the oscillation of the lateral leaflets was almost constant (or even decreased slightly towards complete darkness). We also show that the oscillations could completely stop under prolonged darkness (for longer than about 6 h) and that such halted oscillations could be restarted in most of the leaflets when he light was turned back on. Such stopping of the oscillation of the lateral leaflets in prolonged darkness suggests that these short period oscillations of the lateral leaflets could have a daily component and in natural environment these oscillations could serve the purpose of optimising the amount of light falling on the leaflets or/and facilitating transpiration of water through stomata: Such a finding could have an implication for the answer to the long standing question of adaptive significance of short period oscillation of the Indian telegraph plant Desmodium gyrans (L. F.) DC.
Description: Restricted Access
URI: http://hdl.handle.net/10572/231
Other Identifiers: 0939-5075
Appears in Collections:Research Articles (V. K. Sharma)

Files in This Item:
File Description SizeFormat 
2003 Z Naturforsch 58c 81-86.pdf
  Restricted Access
230.8 kBAdobe PDFView/Open Request a copy


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.