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Blue light effect on growth, light absorption characteristics and photosynthesis of five benthic diatom strains
Mercado, J.M.; del Pilar Sánchez-Saavedra, M.; Correa-Reyes, G.; Lubián, L.; Montero, O.; Figueroa, F.L. (2004). Blue light effect on growth, light absorption characteristics and photosynthesis of five benthic diatom strains. Aquat. Bot. 78(3): 265-277. dx.doi.org/10.1016/j.aquabot.2003.11.004
In: Aquatic Botany. Elsevier Science: Tokyo; Oxford; New York; London; Amsterdam. ISSN 0304-3770, more
Peer reviewed article  

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Keywords
    Benthos; Chlorophylls; Diatoms; Fluorescence; Growth; Light absorption; Optical properties; Photosynthesis; Navicula incerta Grunow, 1880 [WoRMS]; Nitzschia amabilis Suzuki, 2010 [WoRMS]; Nitzschia thermalis (Ehrenberg) Auerswald, 1861 [WoRMS]; ISE, Mexico, Baja California [Marine Regions]; Marine

Authors  Top 
  • Mercado, J.M.
  • del Pilar Sánchez-Saavedra, M.
  • Correa-Reyes, G.
  • Lubián, L.
  • Montero, O.
  • Figueroa, F.L.

Abstract
    Bio-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 (alpha) 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 alpha were also negatively correlated, probably indicating that a higher pigment packaging affects negatively to alpha. The acclimation of the five strains to monochromatic BL for 2 weeks produced a reduction of Pmax and although the effective quantum yield of photosystem II (deltaF/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.

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