The photosynthetic characteristics of red coralline algae, determined using pulse amplitude modulation (PAM) fluorometry

Burdett, H., Hennige, S.J., Francis, F.T.-Y. and Kamenos, N.A. (2012) The photosynthetic characteristics of red coralline algae, determined using pulse amplitude modulation (PAM) fluorometry. Botanica Marina, 55(5), pp. 499-509. (doi:10.1515/bot-2012-0135)

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Abstract

Interest in red coralline algae is increasing due to their projected sensitivity to ocean acidification and their utility as palaeoenvironmental proxies. Thus, it is crucial to obtain a thorough understanding of their basic photosynthetic characteristics and appropriate techniques for use in both laboratory and in situ studies. This study provides fluorescence methodology and data for the ecologically important red coralline alga Lithothamnion glaciale using pulse amplitude modulation (PAM) fluorometry. Lithothamnion glaciale was sufficiently dark-acclimated for in situ work following 10 s of quasi-darkness, attaining 95–98% of the maximum photochemical efficiency (Fv/Fm). Rapid light curves conducted in situ and in the laboratory determined a low light adaptation, with a saturation intensity of 4.45–54.6 μmol photons m-2 s-1. Intra-thallus heterogeneity was observed between branch tips and bases (i.e., within the thallus) using a custom-made 2 mm fibre optic probe (the heterogeneity could not be detected using the standard 5 mm probe). Branch bases were lower light acclimated than the tips, with higher maximum effective quantum yield (Fq′/Fm′max) and lower non-photochemical quenching. Samples measured in May were higher light acclimated than in March, which suggests a degree of seasonal acclimation. Light history and photon irradiance levels were thus found to significantly affect the photosynthetic characteristics of L. glaciale.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Kamenos, Dr Nicholas and Burdett, Miss Heidi
Authors: Burdett, H., Hennige, S.J., Francis, F.T.-Y., and Kamenos, N.A.
Subjects:Q Science > QK Botany
College/School:College of Science and Engineering > School of Geographical and Earth Sciences > Geography
Journal Name:Botanica Marina
ISSN:0006-8055
ISSN (Online):1437-4323

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