background and objectives: active coal is applied in tissue culture media as the absorbant of phenolic compounds and toxic materials; but no research has been done regarding its direct application like spray on plants. application of this material as the carbone source is based on researches done by sucrose; which had highly positive effect on plant growth and development. thus; a hypothesis wa...

This study was carried out in a plantation of a degraded area in Central Amazon, Brazil, in order to assess environmental light effects on leaf pigment concentrations and chlorophyll a fluorescence in mahogany (Swietenia macrophylla King) and tonka bean (Dipteryx odorata Aubl. Willd). Three-year old saplings were grown in an open site (sun) with maximum radiation of approximately 2000 μmol m s ...

Temporal changes in gas exchange and chlorophyll fluorescence of Paeonia suffruticosa seedlings acclimated to three levels of light environments were investigated. There was a significant photosynthetic depression in seedlings acclimated to a long time of shading and then suddenly exposed to full ambient radiation. The decreased transpiration (E ) resulted from ‘feed-forward effect’ mechanism [...

We provide here a general introduction on chlorophyll (Chl) fluorescence, then we present our measurements fast (< 1 s) induction curves (the so-called OJIP transients) dark-adapted intact leaves of Arabidopsis thaliana, under five different light intensities [in the range ~ 500 to 3,000 µmol(photons) m‒2 s‒1] using two instruments: Handy PEA (Hansatech Instruments, UK; e...

A mechanistic understanding of population dynamics requires close examination of species’ differences in how physiological traits interact with environmental variation and translate into demographic variation. We focused on two co-occurring winter annual species (Pectocarya recurvata and Plantago insularis) that differ in photosynthetic resource-use efficiency and demographic responses to envir...

Cyanobacteria are ecologically important photosynthetic prokaryotes that also serve as popular model organisms for studies of photosynthesis and gene regulation. Both molecular and ecological studies of cyanobacteria benefit from real-time information on photosynthesis and acclimation. Monitoring in vivo chlorophyll fluorescence can provide noninvasive measures of photosynthetic physiology in a...

To reveal and quantify the interactive effects of drought stresses and elevated CO2 concentration [CO2] on photochemistry efficiency of cucumber seedlings, the portable chlorophyll meter was used to measure the chlorophyll content, and the Imaging-PAM was used to image the chlorophyll fluorescence parameters and rapid light response curves (RLC) of leaves in two adjacent greenhouses. The result...

In order to promote photosynthetic reactions and biomass yield of microalgae in 15% CO2 from coal-fired flue gas, a self-adaptive microalgal growth system with gene mutation centered on the cellular light response was established through gradient domestication. The Nannochloropsis oceanica CCMP1779 gradually acclimated 0.04%, 3%, 6%, 10% 12% obtain strains predominant adaptation CO2. domesticat...

The key to developing highly active α-Fe2O3-based photocatalysts is improve the charge separation and efficiently utilize electrons with sufficient thermodynamic energy. Herein, α-Fe2O3 nanosheets (FO) were synthesized using a metal-ion-intervened hydrothermal method then coupled SnO2 (SO) obtain SO/FO nanocomposites. Subsequently, nanosized Ag was selectively loaded on SO photo-deposition resu...

A randomized complete block design experiment was designed to characterize the relationship between production of total flavonoids and phenolics, anthocyanin, photosynthesis, maximum efficiency of photosystem II (Fv/Fm), electron transfer rate (Fm/Fo), phenyl alanine lyase activity (PAL) and antioxidant (DPPH) in Labisia pumila var. alata, under four levels of irradiance (225, 500, 625 and 900 ...