Changes in the composition of photosynthetic pigments and cellular structure of the brown algae Fucus vesiculosus L. and F. serratus L. from the Barents Sea during a prolonged period of darkness

Changes in the composition of photosynthetic pigments and cellular structure of the brown algae... The effect of a prolonged absence of light on the photosynthetic pigment content and cell ultrastructure in Fucus vesiculosus L. and F. serratus L. from the Barents Sea was investigated during a 30-day experiment in summer and under natural conditions in winter (at the end of the polar night). With decreasing irradiance, the accumulation of photosynthetic pigments, mainly violaxanthin, occurred. In the absence of light, the contents and ratio of pigments remained unchanged. At the end of the experiment, the following changes occurred in the cellular ultrastructure: the disappearance of the stored substances and the change in the shape and compression of the physodes. Higher proportions of mitochondria in the cell and of cristae in the mitochondria are indicative of the enhancement of the respiration processes. No degradational changes were found in the tissues and cells of fucoids during prolonged periods of darkness. This suggests the possibility of their transition from photoautotrophy to endogenous nutrition. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Marine Biology Springer Journals

Changes in the composition of photosynthetic pigments and cellular structure of the brown algae Fucus vesiculosus L. and F. serratus L. from the Barents Sea during a prolonged period of darkness

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Publisher
Nauka/Interperiodica
Copyright
Copyright © 2006 by Pleiades Publishing, Inc.
Subject
Life Sciences; Freshwater & Marine Ecology
ISSN
1063-0740
eISSN
1608-3377
D.O.I.
10.1134/S1063074006010032
Publisher site
See Article on Publisher Site

Abstract

The effect of a prolonged absence of light on the photosynthetic pigment content and cell ultrastructure in Fucus vesiculosus L. and F. serratus L. from the Barents Sea was investigated during a 30-day experiment in summer and under natural conditions in winter (at the end of the polar night). With decreasing irradiance, the accumulation of photosynthetic pigments, mainly violaxanthin, occurred. In the absence of light, the contents and ratio of pigments remained unchanged. At the end of the experiment, the following changes occurred in the cellular ultrastructure: the disappearance of the stored substances and the change in the shape and compression of the physodes. Higher proportions of mitochondria in the cell and of cristae in the mitochondria are indicative of the enhancement of the respiration processes. No degradational changes were found in the tissues and cells of fucoids during prolonged periods of darkness. This suggests the possibility of their transition from photoautotrophy to endogenous nutrition.

Journal

Russian Journal of Marine BiologySpringer Journals

Published: Mar 29, 2006

References

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