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Zeitschrift für Naturforschung C

A Journal of Biosciences

Editor-in-Chief: Seibel, Jürgen

Editorial Board: Aigner , Achim / Boland, Wilhelm / Bornscheuer, Uwe / Hoffmann, Klaus


IMPACT FACTOR 2017: 0.882
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CiteScore 2017: 0.92

SCImago Journal Rank (SJR) 2017: 0.288
Source Normalized Impact per Paper (SNIP) 2017: 0.448

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1865-7125
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Volume 58, Issue 1-2

Issues

Light-Dependent Changes in the Leaflet Movement Rhythm of the Plant Desmodium gyrans

Vijay Kumar Sharma
  • Chronobiology Laboratory, Evolutionary and Organismal Biology Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore- 560 064, Karnataka, India
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/ Tom Kristian Bardal
  • Department of Physics, Norwegian University of Science and Technology, N-7491 Trondheim, Norway.
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/ Anders Johnsson
  • Corresponding author
  • Department of Physics, Norwegian University of Science and Technology, N-7491 Trondheim, Norway.
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Published Online: 2014-06-02 | DOI: https://doi.org/10.1515/znc-2003-1-215

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 μmol · 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 μmol · 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

Keywords: Ultradian Rhythms; Leaflets; Desmodium

About the article

Received: 2002-09-20

Published Online: 2014-06-02

Published in Print: 2003-02-01


Citation Information: Zeitschrift für Naturforschung C, Volume 58, Issue 1-2, Pages 81–86, ISSN (Online) 1865-7125, ISSN (Print) 0939-5075, DOI: https://doi.org/10.1515/znc-2003-1-215.

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© 1946 – 2014: Verlag der Zeitschrift für Naturforschung. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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