scholarly journals Evaluation of instant light-response curves of chlorophyll fluorescence parameters obtained with a portable chlorophyll fluorometer on site in the field

2000 ◽  
Vol 23 (12) ◽  
pp. 1397-1405 ◽  
Author(s):  
U. Rascher ◽  
M. Liebig ◽  
U. Luttge
Keyword(s):  
Chlorophyll Fluorescence ◽  
Light Response ◽  
Response Curves ◽  
Chlorophyll Fluorescence Parameters ◽  
Fluorescence Parameters ◽  
Light Response Curves

scholarly journals Comparative research of photosynthetic processes in selected poikilohydric organisms from Mediterranean and Central-European alpine habitats

2018 ◽  
Vol 8 (2) ◽  
pp. 286-298
Author(s):  
Gabriella Nora Maria Giudici ◽  
Josef Hájek ◽  
Miloš Barták ◽  
Svatava Kubešová
Keyword(s):  
Czech Republic ◽  
Chlorophyll Fluorescence ◽  
Photochemical Quenching ◽  
Marchantia Polymorpha ◽  
Effective Quantum Yield ◽  
Response Curves ◽  
Chlorophyll Fluorescence Parameters ◽  
Fluorescence Parameters ◽  
Mediterranean Habitats ◽  
Non Photochemical Quenching

Dehydration-induced decrease in photosynthetic activity was investigated in five poikilohydric autotrophs using chlorophyll fluorescence parameters recorded during controlled desiccation. For the study, two representatives of mosses from alpine zone (Rhizomnium punctatum, Rhytidiadelphus squarrosus) of the Jeseníky Mts. (Czech Republic) were used. Other two experimental species were mediterranean habitats liverwort (Pellia endiviifolia) and moss (Palustriella commutata), collected from under Woodwardia radicans canopy in the Nature Reserve Valle delle Ferriere (Italy). The last species was a liverwort (Marchantia polymorpha) collected from lowland site (Brno, Moravia, Czech Republic). We investigated the relationship between relative water content (RWC) and several chlorophyll fluorescence parameters evaluating primary photochemical processes of photosynthesis, such as effective quantum yield of photosynthetic processes in photosystem II (ΦPSII), and non-photochemical quenching (qN). With desiccation from fully wet (RWC = 100%) to dry state (RWC = 0%), ΦPSII exhibited a rapid (R. punctatum) and slow decline of ΦPSII (R. squarrosus, P. endiviifolia, M. polymorpha, and P. commutata). Shapes of dehydration-response curves were species-specific. RWC0.5, i.e. the RWC at which the sample showed half of maximum ΦPSII, reflected the species-specificity. It reached 65% in desiccation sensitive (R. punctatum), 53% and 43% in semi-tolerant (P. commutata and R. squarrosus), 24% and 18% in desiccation-tolerant species (P. endiviifolia and M. polymorpha). In all experimental species, non-photochemical quenching (qN) of absorbed light energy showed high values at RWC = 100% and a slight increase with desiccation. Steady state chlorophyll fluorescence (FS) remained high during desiccation and was not correlated with ΦPSII.  

scholarly journals A Method for the Rapid Generation of Nonsequential Light-Response Curves of Chlorophyll Fluorescence

2013 ◽  
Vol 163 (3) ◽  
pp. 1089-1102 ◽  
Author(s):  
João Serôdio ◽  
João Ezequiel ◽  
Jörg Frommlet ◽  
Martin Laviale ◽  
Johann Lavaud
Keyword(s):  
Chlorophyll Fluorescence ◽  
Light Response ◽  
Response Curves ◽  
Light Response Curves ◽  
Rapid Generation

scholarly journals Effects of Microbial Fertilizer on the Growth, Physiology, and Chlorophyll Fluorescence Response of Spinach Seedlings

2020 ◽  
Author(s):  
beibei zhang ◽  
Qi Jing ◽  
Hui Zhang ◽  
Jiaxuan Wang ◽  
Yang Yang
Keyword(s):  
Chlorophyll Fluorescence ◽  
Light Response ◽  
Leaf Length ◽  
Physiological Characteristics ◽  
Utilization Rate ◽  
Bacillus Mucilaginosus ◽  
Chlorophyll Fluorescence Parameters ◽  
Growth Physiology ◽  
Fluorescence Parameters ◽  
Different Types

Abstract We investigated the effects of different types of bacillus on the growth, physiological characteristics, and chlorophyll fluorescence of spinach seedlings in the soil environment of a Qinxi demonstration garden in Taibai County. Five different fertilization treatments were conducted in the growing room: no fertilizer (CK), addition of Bacillus subtilis (Bs, T1), addition of Bs and Bacillus mucilaginosus (Bm) (T2), addition of Bs and Bacillus amyloliquefaciens (Ba) (T3), and addition of Bs and Ba (T4). There were significant differences in the plant height (PH), leaf length (LL), and leaf weight (LW) of the spinach seedlings (F=54.37, 13.30, and 46.03, respectively; P<0.01). The growth and physiological characteristics of the spinach seedlings attained a maximum under the Bs and Bm treatments. There were differences in the activities of the PSII reaction centers between the five treatments. Under the Bs and Bm treatments, the ABS/RC, TR0 /RC, and ET0 /RC increased significantly, while the DI0 /RC decreased. The OJIP curve increased under different types of fertilization, and the growth trends under the Bs and Bm treatments were the largest. The leaf light response curve (LC) increased significantly under the Bs and Bm treatments. The plant growth characteristics (LL, LW, PH) were positively correlated with the J-I-P test chlorophyll fluorescence parameters (PIABS, φP0, φE0, ψ0, TR0/RC, and ET0/RC), and negatively correlated with φD0 and DI0/RC. The leaf physiological characteristics (SP, SC, Chla, Chlb, Chla+b, Chla/b, and WP) were positively correlated with the J-I-P test chlorophyll fluorescence parameters (PIABS, φP0, φE0, ψ0, ABS/RC, TR0 /RC, and ET0 /RC), and negatively correlated with φD0 and DI0 /RC. The leaf MDA was significantly positively correlated with φD0 and DI0 /RC, and positively correlated with other J-I-P test chlorophyll fluorescence parameters. The Bs and Bm treatments promoted the growth of the spinach seedlings and improved the adaptability of the crops to soil by enhancing the effective phosphorus utilization rate.

Photoinduced toxicity of fluoranthene on primary processes of photosynthesis in lichens

2006 ◽  
Vol 39 (1) ◽  
pp. 91-100 ◽  
Author(s):  
Marie KUMMEROVÁ ◽  
štěpán ZEZULKA ◽  
Jana KRULOVÁ ◽  
Jan TŘÍSKA
Keyword(s):  
Chlorophyll Fluorescence ◽  
Bioconcentration Factor ◽  
Lichen Species ◽  
Chlorophyll Fluorescence Parameters ◽  
Fluorescence Parameters ◽  
Photochemical Processes ◽  
Symbiotic Algae ◽  
Lasallia Pustulata ◽  
Photoinduced Toxicity ◽  
Umbilicaria Hirsuta

The effect of increasing concentrations (0·01, 0·1, 1 and 5 mg l−1) of intact (FLT) and photo-modified (phFLT) fluoranthene and the duration of exposure (1, 2, 3, 5 and 7 days) on the chlorophyll fluorescence parameters (F0, FV/FM, and ΦII) of symbiotic algae in the thalli of two foliose lichens Lasallia pustulata and Umbilicaria hirsuta was investigated. In addition the FLT concentration in thalli of both lichen species was determined and a bioconcentration factor (BCF) was calculated. The results obtained demonstrated that the concentrations of FLT and especially phFLT (1 and 5 mg l−1) applied affected primary photochemical processes of photosynthesis in the algae of both lichen species. The F0 value increased and the FV/FM and ΦII values decreased. The fluoranthene content in the thallus of both lichen species increased with increasing FLT concentration in the environment.

scholarly journals Photosynthetic response to nitrogen source and different ratios of nitrogen and phosphorus in toxic cyanobacteria, Microcystis aeruginosa FACHB-905

2016 ◽  
Author(s):  
Guotao Peng ◽  
Zhengqiu Fan ◽  
Xiangrong Wang ◽  
Chen Chen
Keyword(s):  
Chlorophyll Fluorescence ◽  
Algal Blooms ◽  
Freshwater Ecosystems ◽  
Cyanobacterial Blooms ◽  
Photosynthetic Response ◽  
Nitrogen And Phosphorus ◽  
Ammonium Toxicity ◽  
Chlorophyll Fluorescence Parameters ◽  
Fluorescence Parameters ◽  
N Assimilation

<p>The frequent outbreak of cyanobacterial blooms has become a worldwide phenomenon in freshwater ecosystems. Studies have elucidated the close relationship between harmful algal blooms and nutrient contents, including the loading of nitrogen and the ratios of nitrogen (N) and phosphorus (P). In this study, the effect of inorganic (nitrate and ammonium) and organic (urea) nitrogen at varied N/P ratios on the <em>Microcystis</em> <em>aeruginosa</em> FACHB-905 accumulation and photosynthesis was investigated.  The optimal NO<sub>3</sub>/P in this study were 30~50 indicated by the cell abundance (4.1×10<sup>6</sup>/mL), pigment concentration (chlorophyll a 3.1 mg/L,  phycocyanin 8.3mg/L), and chlorophyll fluorescence parameters (<em>rETR</em>, <em>E<sub>k</sub>, α, φPSII</em> and <em>F<sub>v</sub>/F<sub>m</sub> </em>values), while too high NO<sub>3</sub>-N (N/P=100:1) would cause an intracellular nitrate inhibition, leading to a decrease of photosynthetic activity. In addition, low concentration of NH<sub>4</sub>-N (N/P=4:1) would favor the <em>M. aeruginosa </em>growth and photosynthesis, and high NH<sub>4</sub>/P ratio (&gt;16) would rise the ammonium toxicity of algal cells and affect the N assimilation. In urea treatments, <em>M. aeruginosa </em>responded similarly to the NH<sub>4</sub>-N treatments both in growth curves and pigment contents, and the favorable N/P ratio was between 16~30, suggested by the chlorophyll fluorescence parameters. The results demonstrated that the various chemical forms of N and N/P ratios have a significant impact on <em>Microcystis</em> abundance and photosynthesis. More work is needed to figure out the mechanism of nitrogen utilization by <em>Microcystis</em> and  the photosynthetic response to nutrient stress at the molecular level.</p>

Photosynthetic light-response curves

Planta ◽  
1993 ◽  
Vol 189 (2) ◽  
Author(s):  
E. �gren ◽  
J.R. Evans
Keyword(s):  
Light Response ◽  
Response Curves ◽  
Light Response Curves
Sign in / Sign up

Export Citation Format

Share Document