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Summary: Oecologia (2004) 138: 193201
DOI 10.1007/s00442-003-1424-z
ECOPHYSIOLOGY
Gareth A. Pearson . Ester A. Serrão . Matthew Dring .
Rainer Schmid
Blue- and green-light signals for gamete release in the brown
alga, Silvetia compressa
Received: 25 February 2003 / Accepted: 2 October 2003 / Published online: 5 November 2003
# Springer-Verlag 2003
Abstract The intertidal brown alga Silvetia compressa
releases gametes from receptacles (the reproductive tissue)
rapidly upon a dark transfer (following a photosynthesis-
dependent period in the light, termed potentiation). In this
study, the wavelength-dependence of this process was
investigated. During the potentiation period in white light
(WL), gametes are not released. However, gametes were
released during potentiation in blue light (BL), or in low
red light/blue light (RL/BL) ratios, but not in RL alone,
high RL/BL ratios, or in broadband blue-green light (B-
GL) (presence of BL, but absence of RL). RL was as
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