Changes in photoreceptor currents and their sensitivity to the chemoeffector tryptone during gamete mating in<Emphasis Type="Italic"> Chlamydomonas reinhardtii</Emphasis> |
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Authors: | Elena G Govorunova Olga O Voytsekh Oleg A Sineshchekov |
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Institution: | (1) Biology Department, Moscow State University, Vorobievy Gory, 119992 Moscow, Russia |
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Abstract: | Chlamydomonas reinhardtii Dangeard generates photoreceptor currents (PCs) upon light excitation. These currents play a key role in the signal transduction
chain for photomotility responses. We have previously found that inhibition of PCs by tryptone occurs only in gametes that
display chemotaxis toward this agent, and is not observed in chemotactically insensitive vegetative cells. Here we show that
the sensitivity to tryptone is characteristic of gametes of both mating types, and examine the influence of gamete mating
on PCs and their sensitivity to tryptone. The amplitude of PCs increases after cell fusion, but the sensitivity of these currents
to tryptone decreases upon flagellar adhesion and/or an increase in the intracellular cAMP concentration. Net chemotaxis toward
tryptone is reduced in young zygotes compared to gametes. We conclude that gamete mating leads to rapid inactivation of a
gamete-specific chemosensory system. |
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Keywords: | Chemotaxis Phototaxis Gametes Mating Flagellates |
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