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A Model for Signal Transduction during Gamete Release in the Fucoid Alga Pelvetia compressa1
 

Summary: A Model for Signal Transduction during Gamete Release in
the Fucoid Alga Pelvetia compressa1
Gareth Anthony Pearson2
* and Susan Howard Brawley3
Department of Plant Biology and Pathology, University of Maine, Orono, Maine 044695722
Fucoid algae release gametes into seawater following an induc-
tive light period (potentiation), and gamete expulsion from poten-
tiated receptacles of Pelvetia compressa began about 2 min after a
light-to-dark transition. Agitation of the medium reversed potenti-
ation, with an exponential time course completed in about 3 h. Light
regulated two signaling pathways during potentiation and gamete
expulsion: a photosynthetic pathway and a photosynthesis-
independent pathway in which red light was active but blue light
was not. Uptake of K appears to have an important role in poten-
tiation, because a 50% inhibition of potentiation occurred in the
presence of the tetraethylammonium ion, a K -channel blocker. A
central role of anion channels in the maintenance of potentiation is
suggested by the premature release of gametes in the light when
receptacles were incubated with inhibitors of slow-type anion chan-
nels. An inhibitor of tyrosine kinases, tyrphostin A63, also inhibited

  

Source: Alberto, Filipe - Centro de Ciencias do Mar, Universidade do Algarve

 

Collections: Environmental Sciences and Ecology; Biology and Medicine