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

Content Provider	Semantic Scholar
Author	Mercado, Jesús M. Sánchez-Saavedra, M. Del Pilar Correa-Reyes, Gabriel Lubián, Luis María Montero, Olimpio Figueroa, Félix L.
Copyright Year	2004
Abstract	Bio-optical characteristics and photosynthetic performance of five strains of benthic diatoms belonging to three different species (Nitzschia thermalisKutzing var. minor Hilse sensu Podzorski, Nitzschia laevisHust and Navicula incertaGrunow) 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 () ranged from 0.22 to 3.58mol O2 per mg Chl a min −1 and from 0.012 to 0.169mol O2 per mg Chl a (mol photons m −2 s −1 ) −1 respectively. Onset of light saturation parameter ( Ek) ranged from 43 to 12mol 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 (� F/Fm� ) was not affected. In addition to these changes, chlorophyll a increased and a ∗ decreased in the five strains. Therefore, it was concluded
Starting Page	265
Ending Page	277
Page Count	13
File Format	PDF HTM / HTML
DOI	10.1016/j.aquabot.2003.11.004
Volume Number	78
Alternate Webpage(s)	http://atarazanas.sci.uma.es/docs/articulos/16512625.pdf
Alternate Webpage(s)	https://doi.org/10.1016/j.aquabot.2003.11.004
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article