Quantum irradiance may also affect secondary metabolism in corals. To our knowledge, there is only one study
that assessed the effect of light intensity on metabolite production. Maximum concentrations of flexibilide, a metabolite with diverse pharmaceutical applications produced by
the soft coral Sinularia flexibilis(Khalesiet al.2008), were
observed at irradiances of 400lmol quanta m
2
s
1
(Khalesi et al. 2009). These results are likely associated with a
chemical response of the coral to light stress-induced adaptive bleaching, as S. flexibilisalso shows higher flexibilide
concentrations 1 month after bleaching (Michalek-Wagner
& Bowden 2000). However, the same study reported contrasting results for other secondary metabolites produced
byS. flexibilis(sinulariolide) and by Lobophytum compactum(isolbophytolide). Although bleaching is the loss of the
intracellular endosymbionts and is usually associated with
light and/or thermal stress, the synthesis of terpenoid secondary metabolites in both latter species is associated with
the host and not with the symbionts (Michalek-Wagner
et al.2001). Hence, the mechanism by which light intensity
influences the production of these metabolites remains
unknown
Quantum irradiance may also affect secondary metabolism in corals. To our knowledge, there is only one studythat assessed the effect of light intensity on metabolite production. Maximum concentrations of flexibilide, a metabolite with diverse pharmaceutical applications produced bythe soft coral Sinularia flexibilis(Khalesiet al.2008), wereobserved at irradiances of 400lmol quanta m2s1(Khalesi et al. 2009). These results are likely associated with achemical response of the coral to light stress-induced adaptive bleaching, as S. flexibilisalso shows higher flexibilideconcentrations 1 month after bleaching (Michalek-Wagner& Bowden 2000). However, the same study reported contrasting results for other secondary metabolites producedbyS. flexibilis(sinulariolide) and by Lobophytum compactum(isolbophytolide). Although bleaching is the loss of theintracellular endosymbionts and is usually associated withlight and/or thermal stress, the synthesis of terpenoid secondary metabolites in both latter species is associated withthe host and not with the symbionts (Michalek-Wagneret al.2001). Hence, the mechanism by which light intensityinfluences the production of these metabolites remainsunknown
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