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Title

Blue light effect on growth, light absorption characteristics and photosynthesis of five benthic diatom strains

AuthorsMercado, Jesús M.; Sánchez-Saavedra, María Pilar; Correa-Reyes, Gabriel; Lubián, Luis M. ; Montero, Olimpio; Figueroa, Félix L.
KeywordsBio-optic
Benthic diatoms
Chlorophyll fluorescence
Light quality
Photosynthesis
Issue Date25-Feb-2004
PublisherElsevier
CitationAquatic Botany 78(3): 265-277 (2004)
AbstractBio-optical characteristics and photosynthetic performance of five strains of benthic diatoms belonging to three different species (Nitzschia thermalis Kützing var. minor Hilse sensu Podzorski, Nitzschia laevis Hust and Navicula incerta Grunow) were examined. The effects of treatments with monochromatic blue light (BL) were also determined. The values of photosynthesis rate at saturating photon fluence rate (PFR) (Pmax) and ascending initial slope of the P-PFR curves (α) ranged from 0.22 to 3.58 μmol O2 per mg Chl a min−1 and from 0.012 to 0.169 μmol O2 per mg Chl a (μmol photons m−2 s−1)−1 respectively. Onset of light saturation parameter (Ek) ranged from 43 to 12 μmol photons m−2 s−1. These values were comparable to those reported from measurements performed with sub-tidal benthic communities. In vivo effective optical cross-section of Chl a (a∗ values) was correlated to average cell surface area. Interestingly, a∗ and α were also negatively correlated, probably indicating that a higher pigment packaging affects negatively to α. The acclimation of the five strains to monochromatic BL for 2 weeks produced a reduction of Pmax and α although the effective quantum yield of photosystem II (ΔF/Fm′) was not affected. In addition to these changes, chlorophyll a increased and a∗ decreased in the five strains. Therefore, it was concluded that the reduction of a∗ could contribute to the changes in the photosynthetic performance in BL.
Description13 páginas, 3 figuras, 3 tablas.
Publisher version (URL)http://dx.doi.org/10.1016/j.aquabot.2003.11.004
URIhttp://hdl.handle.net/10261/43031
DOI10.1016/j.aquabot.2003.11.004
ISSN0304-3770
Appears in Collections:(ICMAN) Artículos
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