scholarly journals Optical Properties of Corals Distort Variable Chlorophyll Fluorescence Measurements

2019 ◽  
Vol 179 (4) ◽  
pp. 1608-1619 ◽  
Author(s):  
Daniel Wangpraseurt ◽  
Mads Lichtenberg ◽  
Steven L. Jacques ◽  
Anthony W. D. Larkum ◽  
Michael Kühl
Keyword(s):  
Optical Properties ◽  
Chlorophyll Fluorescence ◽  
Fluorescence Measurements ◽  
Variable Chlorophyll Fluorescence

scholarly journals The effect of storage temperature of cucumber fruit on chlorophyll fluorescence

2013 ◽  
Vol 53 (1) ◽  
pp. 57-64
Author(s):  
Ryszard Kosson
Keyword(s):  
Chlorophyll Fluorescence ◽  
Storage Temperature ◽  
Optimum Level ◽  
Variable Fluorescence ◽  
Fluorescence Measurements ◽  
Cucumber Fruit ◽  
Variable Chlorophyll Fluorescence ◽  
Relative Variable ◽  
Temperature Levels ◽  
Relative Variable Fluorescence

The effect of three storage temperature levels: 12,5°C, 20°C, and 1,5°C on basic indexes of chlorophyll fluorescence of cucumber fruits was studied. The greenhouse grown cucumber fruits cv. Wiktor F1 were stored in perforated polyethylene bags or without packages. The minimum chlorophyll fluorescence (Fo), maximum chlorophyll fluorescence (Fm), variable chlorophyll fluorescence (Fv) and relative variable fluorescence (Fv/Fm) of the cucumber peel were measured. Relative variable fluorescence was decTeasing when cucumbers were stored at temperature lower or higher than optimum level. The chlorophyll fluorescence measurements can be helpful for determination of appropriate temperature parameters of cucumber storage.

scholarly journals COMPARATIVE HEAT TOLERANCE AMONG FIVE SPECIES OF BIRCH

HortScience ◽  
1992 ◽  
Vol 27 (6) ◽  
pp. 627d-627
Author(s):  
Thomas G. Ranney
Keyword(s):  
Chlorophyll Fluorescence ◽  
Stomatal Conductance ◽  
Heat Tolerance ◽  
Dark Respiration ◽  
Leaf Gas Exchange ◽  
Betula Papyrifera ◽  
Respiration Rates ◽  
Fluorescence Measurements ◽  
Variable Chlorophyll Fluorescence ◽  
Paper Birch

Leaf gas exchange and chlorophyll fluorescence measurements were used as indices for evaluating heat tolerance among five species of birch: paper (Betula papyrifera), European (B. pendula), Japanese (B. platyphylla var. japonica `Whitespire'), Himalayan (B. jacquemontii), and river (B. nigra). Measurements were conducted on individual leaves at temperatures ranging from 25C to 40C. Carbon exchange rates (CER) were depressed for all species at 40C. However, there was considerable variation in both absolute and relative (percent of maximum) CER among species at 40C; river birch maintained the highest absolute and relative CER while CER of paper birch was reduced the most. Although stomatal conductance of paper birch decreased at higher temperatures, internal leaf CO2 increased indicating that reduced stomatal conductance was not responsible for decreased CER. Stomatal conductance of river birch increased at higher temperatures which provided for enhanced uptake of CO2 and greater evaporative cooling. Variable chlorophyll fluorescence decreased similarly for both species with increasing temperatures. Measurements of dark respiration rates over the range of 25C to 40C suggested that the primary factor influencing variation in CER at higher temperatures was due to variation in respiration rates at higher temperatures.

Decreased photosynthetic efficiency in plant species exposed to multiple airborne pollutants along the Russian-Norwegian border

2000 ◽  
Vol 78 (8) ◽  
pp. 1021-1033 ◽  
Author(s):  
Ann Marie Odasz-Albrigtsen ◽  
Hans Tømmervik ◽  
Patrick Murphy
Keyword(s):  
Chlorophyll Fluorescence ◽  
Plant Species ◽  
Photosynthetic Efficiency ◽  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Plant Cover ◽  
Mixed Forest ◽  
Airborne Pollutants ◽  
Fluorescence Measurements ◽  
Study Sites

Photosynthetic efficiency was estimated by chlorophyll fluorescence measurements (Fv/Fm) in 11 plant species growing along a steep gradient of airborne pollution along the Russian-Norwegian border (70°N, 30°E). Photosynthetic efficiency was positively correlated with environmental variables including annual temperature and a maritime gradient and was negatively correlated with the airborne concentrations of Cu, Ni, and SO2 from the Cu-Ni smelters. Photosynthetic efficiency in six plant species from the mixed forest, but not pine (Pinus sylvestris L.), and three species from the birch forest was inversely correlated with SO2 and the concentrations of Ni and Cu in lichens. Measurement of fluorescence in these species was a sensitive indicator of pollutant impact. Plant cover at the 16 study sites and the photosynthetic efficiency of five target species correlated with normalized difference vegetation index (NDVI) values. This study demonstrated that it is possible to detect relations among field-measured ecophysiological responses in plants, levels of airborne pollutants, and satellite remote-sensed data.Key words: chlorophyll fluorescence, smelters, sulfur dioxide, nickel, copper, normalized difference vegetation index (NDVI).

Chlorophyll fluorescence evaluation of agrochemical interactions with propanil on propanil-resistant barnyardgrass (Echinochloa crus-galli)

Weed Science ◽  
1999 ◽  
Vol 47 (1) ◽  
pp. 13-19 ◽  
Author(s):  
Jason K. Norsworthy ◽  
Ronald E. Talbert ◽  
Robert E. Hoagland
Keyword(s):  
Chlorophyll Fluorescence ◽  
Electron Transport ◽  
Synergistic Effects ◽  
Laboratory Studies ◽  
Photosynthetic Inhibition ◽  
Fluorescence Measurements ◽  
Transport Inhibition ◽  
Leaf Segments

Resistance to propanil by a barnyardgrass (BYG) biotype has been reported, and its occurrence is becoming widespread in U.S. rice-producing regions. Interactions between propanil and the herbicides anilofos, molinate, pendimethalin, piperophos, quinclorac, and thiobencarb and the insecticide carbaryl were evaluated in laboratory studies for improved control of propanil-resistant barnyardgrass (R-BYG). Chlorophyll fluorescence measurements of BYG leaf segments were used to ascertain electron transport inhibition and to assess the synergy/antagonism of propanil (100 μM) with the various additives (50 μM). Synergistic effects on photosynthetic inhibition were found with anilofos, carbaryl, pendimethalin, and piperophos in combination with propanil. Such synergistic actions of chemicals with propanil may lead to chemical combinations useful for R-BYG control.

Sign in / Sign up

Export Citation Format

Share Document