Chlamydomonas reinhardtii cy6Nac2.49 is a genetically modified algal strain that activates photosynthesis in a cyclical manner, so that photosynthesis is not active constitutively in the presence of oxygen, but is turned on only in response to a metabolic trigger (anaerobiosis). Here, we further investigated hydrogen production by this strain comparing it with the parental wild-type strain unde...

Salinity is a leading threat to crop growth throughout the world. Salt stress induces altered physiological processes and several inhibitory effects on of cereals, including wheat (Triticum aestivum L.). In this study, we determined salinity five spring winter genotypes seedlings. We evaluated salt root shoot attributes, i.e., length (RL), (SL), relative rate (RGR-RL), (RGR-SL). The ionic conte...

This study explores costs of mouth brooding and the response of parent and offspring to brooding under hypoxia in the maternal African mouth brooder Pseudocrenilabrus multicolor. Fish of swamp origin were acclimated to hypoxia (1.42 mg oxygen L(-1)) or normoxia (8.00 mg oxygen L(-1)) for a minimum of 6 months prior to measures of metabolic rate and embryo traits. Regardless of brooding stage, s...

The C3 plants are frequently suffering from exposure to high temperature stress which limits the growth and yield of these plants. This study seeks to clarify the physiological mechanisms of heat tolerance in relation to oxidative stress in C3 species. Fifteen C3 species were exposed to prolonged moderately high temperature stress 36/30°C for 40 days in a growth chamber. Chlorophyll fluorescenc...

The hypothesis that fluorescence in scorpions functions in the detection of ultraviolet light was tested. We reduced the fluorescence of scorpions by prolonged exposure to ultraviolet light on a 16:8 h light:dark cycle and compared their activity levels and light environment choices to unmodified scorpions in simple arenas that were half in shadow and half exposed to light. Three different ligh...

Leaf chlorophyll fluorescence parameters as well as chlorophyll content were compared in three dominant mangrove species grown in two zones with different salinity in the Bhitarakanika National Park. The accumulation of dry matter and chlorophyll content in leaves decreased under high saline conditions. Quantification and de-convolution of chlorophyll fluo-rescence transient into several phenom...

Two high mountain plants Soldanella alpina (L.) and Ranunculus glacialis (L.) were transferred from their natural environment to two different growth conditions (22 degrees C and 6 degrees C) at low elevation in order to investigate the possibility of de-acclimation to light and cold and the importance of antioxidants and metabolite levels. The results were compared with the lowland crop plant ...

Lichens can survive and cope with unsufficient water supply resulting in low intrathalline relative content. Under such conditions, photosynthesis is negatively affected by different degree of dehydration. In our study, fully hydrated samples Xanthoria elegans, Umbilicaria decussata Usnea aurantiaco-atra were light-acclimated during following desiccation from a to dry state, steady-state chloro...

Measurements of in vivo chlorophyll a fluorescence made non-invasively on microphytobenthos samples represent the depth integration of the fluorescence emitted at different depths within the sediment. The effects of depth integration on fluorescence parameters and implications for the calculation and interpretation of indices used in quenching analysis were studied using a simulation model base...