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.
journal_name
Plantajournal_title
Plantaauthors
Govorunova EG,Voytsekh OO,Sineshchekov OAdoi
10.1007/s00425-006-0357-2subject
Has Abstractpub_date
2007-01-01 00:00:00pages
441-9issue
2eissn
0032-0935issn
1432-2048journal_volume
225pub_type
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