Nutation rhythm of growing pine hypocotyl (Pinus silvestris L.) interferred with a phototropic stimulus |
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Authors: | M Spurný |
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Institution: | 1. Department of Forest Biology, Institute of Botany, Czechoslovak Academy of Sciences, Brno, Po?í?i 3b, 603 00, Brno, Czechoslovakia
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Abstract: | The interaction of nutation oscillation and phototropic curvature mechanisms of growing pine hypocotyl(Pinus silvestris L.) was investigated. Nutation parameters of growing hypocotyl are not affected by continuous lateral illumination. Frequency
and nutation amplitudes undergo changes which are dependent on plant development and are nearly the same when plants are illuminated
from one side or from above. Lateral illumination, however, induces a phase shift. This deviation from a normal nutation rhythm
usually disappears after a period of time equal to three nutation revolutions,i.e. after 12 h.
The positive phototropio response of nutating hypocotyl is dependent on the phase in which the hypocotyl is exposed to the
lateral illumination:(a) nutation perihelium,(b) ahelium and(c) nutation interphase. These response-variants are compared with the expected gradients of plant hormones at the opposite sites
of the hypocotyle. Analysis of location of the individual movement reactions(i.e. oscillations as a component of the geocontrol system and phototropic curvature) together with the determination of the zone
of maximum elongation indicates the existence of different receptory centres of these two movement systems. In the case of
the phototropic response reaction it is possible to consider the presence of different photo- and biochemical mechanisms at
least for a part of this system. |
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