AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
|
|||||||
The STUDIA UNIVERSITATIS BABEŞ-BOLYAI issue article summary The summary of the selected article appears at the bottom of the page. In order to get back to the contents of the issue this article belongs to you have to access the link from the title. In order to see all the articles of the archive which have as author/co-author one of the authors mentioned below, you have to access the link from the author's name. |
|||||||
STUDIA BIOLOGIA - Issue no. 2 / 2004 | |||||||
Article: |
SALT STRESS TOLERANCE OF A FRESHWATER GREEN ALGA UNDER DIFFERENT PHOTON FLUX DENSITIES. Authors: LASZLO FODORPATAKI, CSABA BARTHA. |
||||||
Abstract: Salinity stress and unfavorable light conditions are main limiting factors of plant productivity both in aquatic and terrestrial, natural and anthropically modified environments. This is the reason why the identification of physiological responses to the interactive effects of high salt concentration and different photon flux densities is an important requirement for the selection of tolerant and highly productive plant ecotypes under stressful environmental conditions. The aim of this study is to identify physiological parameters which enable the evaluation of the degree of salt stress tolerance and the energetic requirements of protective mechanisms based on the photochemical conversion of light energy. The axenic monoalgal cultures of Scenedesmus opoliensis were grown under controlled conditions in the presence of 0, 0.1 and 0.5 M NaCl at photon flux densities of 5, 50 and 100 μM m-2s-1. The dynamics of growth and biomass production, as well as the photosynthetic pigment content was determined for all the experimental variants, the significance of the results was evaluated with the one-way ANOVA and with the Tukey test. The investigated freshwater microalga can easily acclimate to high salt concentrations, under these conditions the rate of cell divisions increases, the cells develop very small light-harvesting antennae and they excrete high amounts of mucilage in which the individuals form extended aggregates. | |||||||