THE EFFECT OF LIGHT AND TEMPERATURE ON THE GROWTH AND RESPIRATION OF BOTRYTIS SQUAMOSA

1958 ◽  
Vol 36 (6) ◽  
pp. 927-934 ◽  
Author(s):  
R. H. Stinson ◽  
R. S. Gage ◽  
E. B. MacNaughton
Keyword(s):  
Carbon Dioxide ◽  
Maximum Growth ◽  
Temperature Sensitive ◽  
Gas Analyzer ◽  
Botrytis Squamosa ◽  
Light Levels ◽  
Considerable Portion ◽  
Mycelial Mass ◽  
Infrared Gas Analyzer ◽  
Effect Of Light

The fungus organism Botrytis squamosa Walker when maintained at constant temperature is unaffected by light levels as high as 100 ft-c for periods of several days and by levels of 250 ft-c for periods of a few hours. This is contrary to an earlier report which said that an illuminance of 70 ft-c would prevent growth of the organism. It is suspected that a combination of undetected temperature gradients and the variability of the organism lead to the earlier report of a light inhibition.The organism is temperature sensitive. No growth occurred at, or beyond, 30 °C. Maximum growth occurred at 23 °C, the lowest temperature used in the investigations.While all portions of the mycelial mass evolve some carbon dioxide, the most active evolution is generally around the circumference. Variations in age and circumference accounted for a considerable portion of the variability in the carbon dioxide evolution.Measuring techniques involved the use of thermocouples, a radiation thermopile and photronic cell, and an infrared gas analyzer.

Net carbon dioxide exchange of wheat, sorghum, and soybean

1975 ◽  
Vol 53 (4) ◽  
pp. 382-389 ◽  
Author(s):  
E. T. Kanemasu ◽  
C. K. Hiebsch
Keyword(s):  
Carbon Dioxide ◽  
Dry Matter ◽  
Growing Season ◽  
Dry Matter Production ◽  
Carbon Dioxide Exchange ◽  
Gas Analyzer ◽  
Light Saturation ◽  
Matter Production ◽  
Infrared Gas Analyzer ◽  
Effect Of Light

Canopy net carbon dioxide exchange (NCE) rates are needed to understand the effect of light on crop growth and development. NCE rates of sorghum, soybean, and wheat canopies were determined using field chambers and an infrared gas analyzer throughout a growing season. Whereas sorghum attained peak NCE rates early in season, soybean and wheat did not reach maximum rates until the late reproductive growth stage. Frequently during the season, NCE rates of sorghum were nearly four times those of soybeans and wheat. Solar radiation had a much greater affect on the NCE of sorghum than on that of soybeans. Apparent light saturation was observed in both soybeans and wheat. An expression for dry matter production of sorghum was derived using chamber data. The expression simulated the total dry matter production for sorghum in 1973, 1972, and 1970 within 20%.

Infrared Gas Analyzer for Low Concentrations of Carbon Dioxide

1952 ◽  
Vol 24 (3) ◽  
pp. 591-591 ◽  
Author(s):  
J. M. Watkins ◽  
C. L. Gemmill
Keyword(s):  
Carbon Dioxide ◽  
Gas Analyzer ◽  
Low Concentrations ◽  
Infrared Gas Analyzer

THE ESTABLISHMENT OF CARBON DIOXIDE CONCENTRATION GRADIENTS IN ONTARIO WOODLANDS

1966 ◽  
Vol 44 (3) ◽  
pp. 321-329 ◽  
Author(s):  
J. H. Sparling ◽  
M. Alt
Keyword(s):  
Carbon Dioxide ◽  
Carbon Dioxide Concentration ◽  
Gas Analyzer ◽  
Concentration Gradients ◽  
Carbon Dioxide Concentrations ◽  
High Concentrations ◽  
Infrared Gas Analyzer

Carbon dioxide concentrations were measured in a number of Ontario woodlands with an infrared gas analyzer. Little evidence of season variation in the concentration of carbon dioxide was obtained. Measurements over 24-hour periods revealed the existence of high concentrations, frequently exceeding 500 p.p.m. at night during midsummer. The high concentrations dropped rapidly at sunrise.The existence of extreme stratification of carbon dioxide which had been reported by earlier workers was not confirmed.

EFFECTS OF SOYBEAN LEAFLET TYPE ON NET CARBON DIOXIDE EXCHANGE, WATER USE, AND WATER-USE EFFICIENCY

1976 ◽  
Vol 56 (3) ◽  
pp. 455-458 ◽  
Author(s):  
C. K. HIEBSCH ◽  
E. T. KANEMASU ◽  
C. D. NICKELL
Keyword(s):  
Carbon Dioxide ◽  
Water Use Efficiency ◽  
Water Use ◽  
Carbon Dioxide Exchange ◽  
Row Spacing ◽  
Gas Analyzer ◽  
Neutron Attenuation ◽  
Glycine Max L ◽  
Use Efficiency ◽  
Infrared Gas Analyzer

Two near-isogenic soybean (Glycine max (L.) Merrill) lines with normal and narrow leaflets were compared in the field for differences in net carbon dioxide exchange rates, water use, and water-use efficiency with various combinations of population and row spacing. Net carbon dioxide exchange was determined with an open field chamber system and infrared gas analyzer. Water use was estimated from neutron attenuation readings and precipitation. Leaflet type did not significantly affect net carbon dioxide exchange, water use, or yield. Water-use efficiency was only affected at 53 plants/m2 in 38-cm rows, with greater efficiency for the narrow-leaflet cultivar.

scholarly journals Carbon Dioxide Capture Using a Zeolite Molecular Sieve Sampling System for Isotopic Studies (13C and 14C) of Respiration

Radiocarbon ◽  
2005 ◽  
Vol 47 (3) ◽  
pp. 441-451 ◽  
Author(s):  
S M L Hardie ◽  
M H Garnett ◽  
A E Fallick ◽  
A P Rowland ◽  
N J Ostle
Keyword(s):  
Mass Spectrometry ◽  
Molecular Sieve ◽  
Ecosystem Respiration ◽  
Isotope Ratio Mass Spectrometry ◽  
Gas Analyzer ◽  
Sampling System ◽  
Air Stream ◽  
Isotopic Studies ◽  
Isotope Studies ◽  
Infrared Gas Analyzer

A method for collecting an isotopically representative sample of CO2 from an air stream using a zeolite molecular sieve is described. A robust sampling system was designed and developed for use in the field that includes reusable molecular sieve cartridges, a lightweight pump, and a portable infrared gas analyzer (IRGA). The system was tested using international isotopic standards (13C and 14C). Results showed that CO2 could be trapped and recovered for both δ13C and 14C analysis by isotope ratio mass spectrometry (IRMS) and accelerator mass spectrometry (AMS), respectively, without any contamination, fractionation, or memory effect. The system was primarily designed for use in carbon isotope studies of ecosystem respiration, with potential for use in other applications that require CO2 collection from air.

scholarly journals Combined Effect of Light and Temperature on the Production of Saxitoxins in Cylindrospermopsis raciborskii Strains

Toxins ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 38 ◽  
Author(s):  
Marcella Mesquita ◽  
Miquel Lürling ◽  
Fabiane Dorr ◽  
Ernani Pinto ◽  
Marcelo Marinho
Keyword(s):  
Maximum Growth ◽  
Combined Effect ◽  
Cylindrospermopsis Raciborskii ◽  
Tropical Regions ◽  
Batch Cultures ◽  
Light Intensities ◽  
Cell Quota ◽  
Wide Range ◽  
Lower Light ◽  
Effect Of Light

Cylindrospermopsis raciborskii is a potentially toxic freshwater cyanobacterium that can tolerate a wide range of light and temperature. Due to climatic changes, the interaction between light and temperature is studied in aquatic systems, but no study has addressed the effect of both variables on the saxitoxins production. This study evaluated the combined effect of light and temperature on saxitoxins production and cellular quota in C. raciborskii. Experiments were performed with three C. raciborskii strains in batch cultures under six light intensities (10, 40, 60, 100, 150, and 500 μmol of photons m−2 s−1) and four temperatures (15, 20, 25, and 30 °C). The growth of C. raciborskii strains was limited at lower temperatures and the maximum growth rates were obtained under higher light combined with temperatures equal or above 20 °C, depending on the strain. In general, growth was highest at 30 °C at the lower light intensities and equally high at 25 °C and 30 °C under higher light. Highest saxitoxins concentration and cell-quota occurred at 25 °C under high light intensities, but were much lower at 30 °C. Hence, increased temperatures combined with sufficient light will lead to higher C. raciborskii biomass, but blooms could become less toxic in tropical regions.

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