scholarly journals The effect of copper fungicides on the rate of photosynthesis and the transpiration of hop plants

2011 ◽  
pp. 117-123
Author(s):  
Jaroslav Pokorny ◽  
Josef Pulkrábek ◽  
Karel Krofta ◽  
Josef Ježek
Keyword(s):  
Photosynthetic Rate ◽  
Copper Content ◽  
Copper Fungicides ◽  
Before And After ◽  
Elemental Copper ◽  
Rate Of Photosynthesis ◽  
Accredited Laboratory ◽  
Effect Of Copper ◽  
Copper Fungicide ◽  
Infrared Analyzer

The paper evaluates the effect of copper fungicide spraying on the rate of photosynthesis and transpiration of hops, the influence of spraying on the elemental copper content in the leaves and cones hop variety Agnus. Photosynthetic rate was measured by LC pro+ (infrared analyzer) in the Hop Research Institute Saaz in the field in some periods of 2008, 2009 and 2010. Dry cones and leaf samples (taken before and after application of copper fungicides) were analyzed in an accredited laboratory for elemental copper.

Effect of changes in carbohydrate concentration on the rate of net photosynthesis in mature leaves of Abies balsamea

1973 ◽  
Vol 51 (4) ◽  
pp. 751-758 ◽  
Author(s):  
C. H. A. Little ◽  
K. Loach
Keyword(s):  
Photosynthetic Rate ◽  
Abies Balsamea ◽  
Net Photosynthesis ◽  
Total Sugar ◽  
Starch Accumulation ◽  
Carbohydrate Concentration ◽  
Normal Period ◽  
Before And After ◽  
Rate Of Photosynthesis ◽  
Foliar Concentration

The hypothesis that photosynthate accumulation within a leaf inhibits the ongoing rate of photosynthesis was investigated in 6-year-old balsam fir trees. Rates of net photosynthesis and transpiration, and concentrations of starch, total sugar, chlorophyll, and water were measured in 1-year-old or fully expanded, current needles, and leaf resistances to carbon dioxide transfer were calculated. The several-fold rise and fall in the content of carbohydrate (mostly starch) that occurs naturally in 1-year-old needles before and after budbreak was correlated positively rather than negatively with the photosynthetic rate. Shading during the normal period of starch accumulation decreased the concentrations of both starch and total sugar, but did not increase photosynthesis. Continuous cooling of the base of a branch to 2 °C to inhibit translocation of photosynthate did not affect the photosynthetic rate during a 2-week period, nor did it cause carbohydrate accumulation, as measured at the end of the experiment. Removing a ring of bark from a branch base resulted in a large increase in the foliar concentration of starch (but not total sugar) and a small decrease in photosynthesis. However, the concomitant decrease in moisture content, not the accumulation of starch, was more probably the cause of the reduced photosynthesis. We conclude that the rate of photosynthesis in fir needles, at least under normal growing conditions, is not influenced by photosynthate accumulation.

scholarly journals   The effect of application of copper fungicides on photosynthesis parameters and level of elementary copper in hops

2012 ◽  
Vol 58 (No. 2) ◽  
pp. 91-97
Author(s):  
K. Krofta ◽  
J. Pokorný ◽  
T. Kudrna ◽  
J. Ježek ◽  
J. Pulkrábek ◽  
...  
Keyword(s):  
Copper Content ◽  
Gradual Increase ◽  
Copper Fungicides ◽  
Ripening Period ◽  
Copper Compounds ◽  
Vigorous Growth ◽  
Copper Fungicide ◽  
Tight Correlation ◽  
Common Content

Photosynthesis and transpiration rates in the interval of 30 min before and 30 min after copper fungicide application show an increase from the level of 5.0 to 7.0 &micro;mol CO<sub>2</sub>/m<sup>2</sup>/s and 0.75 to 1.00 mmol H<sub>2</sub>0/m<sup>2</sup>/s. Long-term measurements show that the increase of photosynthesis rate after copper application is temporal and fades away after 10&minus;14 days. No stress response was induced after the application of copper fungicides. Contents of copper in hop cones are up to 500 mg/kg if total amount of applied copper does not exceed 15 kg/ha. Contents of copper on leaves are 2&ndash;5 times higher at the same application dose. Application of 5 kg copper per one hectare of vigorous growth of Agnus variety increases content of copper on hop leaves by 1000 mg/kg at least. The same amount of copper increases its content in hop cones by 300 mg/kg at the ripening period. Tight correlation between the amount of copper applied and its content in hops does not exist. Elementary copper from leaves is brought into harvested hops in the form of biological admixtures. Copper content in hop cones shows a decreasing trend, which is given by gradual increase of cones size at the ripening period. Similar trend on hop leaves shows that washing off and dissolving of copper compounds by atmospheric water can participate in this process as well. Common content of copper in untreated hop cones and leaves is up to 20&minus;25 mg/kg. &nbsp; &nbsp;

Effect of copper content on the biodegradation behavior of Fe-Mn-C alloy system

2021 ◽  
pp. 1-11
Author(s):  
Sheng Wei ◽  
Zheng Ma ◽  
Lili Tan ◽  
Junxiu Chen ◽  
R.D.K. Misra ◽  
...  
Keyword(s):  
Copper Content ◽  
Alloy System ◽  
Effect Of Copper

The influence of red and blue light on the rate of photosynthesis and the CO2 compensation point at various oxygen concentrations

1970 ◽  
Vol 48 (6) ◽  
pp. 1251-1257 ◽  
Author(s):  
N. P. Voskresenskaya ◽  
G. S. Grishina ◽  
S. N. Chmora ◽  
N. M. Poyarkova
Keyword(s):  
Nicotiana Tabacum ◽  
Blue Light ◽  
Photosynthetic Rate ◽  
Prolonged Exposure ◽  
Red Light ◽  
Compensation Point ◽  
Gas Analyzer ◽  
Co2 Compensation Point ◽  
Rate Of Photosynthesis ◽  
Light Inhibition

Apparent photosynthesis of attached leaves of Phaseolus vulgaris, Vicia faba, Pisum sativum, and Nicotiana tabacum at various intensities of blue and red light was measured by infrared CO2 gas analyzer in a closed system. Simultaneously the CO2 compensation point was measured.It was found that light-limited photosynthetic rate in blue light was equal to or more than that in red light. Inhibition of photosynthesis, which sometimes occurred at light-saturated intensities of blue light, could be avoided by addition of red light, prolonged exposure of the plants to blue light, or by lowering the O2 concentration. Accordingly, the increase of photosynthetic rate due to change of O2 concentration from 21 to 3% O2 is higher in blue light only when photosynthesis is inhibited by blue light at 21% O2. The data on the action of blue and red light on the CO2 compensation point seems to exclude the activation of photorespiration by blue light.The possible effects of blue light on apparent photosynthesis are discussed on the basis of the results presented.

Effect of copper content on optostructural, morphological and photoelectrochemical properties of MoBi2−x Cu x Se4 thin films

2013 ◽  
Vol 48 (20) ◽  
pp. 7300-7311 ◽  
Author(s):  
Suvarta D. Kharade ◽  
Nita B. Pawar ◽  
Sawanta S. Mali ◽  
Chang K. Hong ◽  
Pramod S. Patil ◽  
...  
Keyword(s):  
Thin Films ◽  
Copper Content ◽  
Photoelectrochemical Properties ◽  
Effect Of Copper

scholarly journals Effect of copper content on the tensile elongation of Al–Cu–Mn–Zr alloys: Experiments and finite element simulations

2020 ◽  
Vol 772 ◽  
pp. 138801 ◽  
Author(s):  
Sumit Bahl ◽  
Xiaohua Hu ◽  
Eric Hoar ◽  
Jiahao Cheng ◽  
J. Allen Haynes ◽  
...  
Keyword(s):  
Finite Element ◽  
Copper Content ◽  
Tensile Elongation ◽  
Finite Element Simulations ◽  
Effect Of Copper ◽  
Zr Alloys

Effect of Copper Content on the Microstructures and Properties of TiB2 Based Cermets by SHS

2005 ◽  
Vol 475-479 ◽  
pp. 1619-1622 ◽  
Author(s):  
Qiang Xu ◽  
Xing Hong Zhang ◽  
Jie Cai Han ◽  
Wei Pan
Keyword(s):  
Copper Content ◽  
Hot Isostatic Pressing ◽  
Metallic Phase ◽  
Bend Strength ◽  
Temperature Synthesis ◽  
Boron Powder ◽  
High Temperature Synthesis ◽  
Effect Of Copper ◽  
Tib2 Particles ◽  
Toughness Improvement

TiB2 based cermets with different copper content were produced from titanium powder, boron powder and copper powder by Self-propagating High-temperature Synthesis under conditions of Pseudo Hot Isostatic Pressing (SHS/PHIP). In order to obtain the optimal copper content, the effect of copper content on the microstructures and properties of TiB2 based cermets was investigated. The size of the TiB2 particles in the products decreased with increasing amounts of copper. The hardness (HRA) and bend strength increased firstly, then decreased with copper increasing. Their maximum values appeared at 20 wt.% and 40 wt.% copper, respectively. The porosity of TiB2 based cermets decreased with the copper content increasing due to good fluidity of copper. With the addition of copper, the fracture toughness of TiB2 based cermets increased gradually. Crack-tip plastic blunting by a ductile metallic phase and crack deflection are the principal mechanisms of toughness improvement of TiB2 based cermets. The range of optimal copper content in the TiB2 based cermets is between 40 wt.% and 50 wt.%.

THE RELATIONSHIP BETWEEN CHLOROPHYLL CONTENT AND RATE OF PHOTOSYNTHESIS IN SOYBEANS

1977 ◽  
Vol 57 (1) ◽  
pp. 1-5 ◽  
Author(s):  
B. R. BUTTERY ◽  
R. I. BUZZELL
Keyword(s):  
Linear Regression ◽  
Chlorophyll Content ◽  
Photosynthetic Rate ◽  
Regression Line ◽  
Quadratic Equation ◽  
Chlorophyll Contents ◽  
Rate Of Photosynthesis ◽  
Highly Correlated ◽  
The Relationship ◽  
Selection Of

Photosynthetic rate of soybeans (on a leaf area basis, PA) estimated from the incorporation of 14CO2 under field conditions was highly correlated with chlorophyll content of the side leaflets of the same leaves. Among a collection of 48 cultivars, the linear regression of PA on chlorophyll content accounted for 44% of the variation, whereas with a selection of genotypes with various mutant chlorophyll genes, the regression accounted for 81%. When the data for the two tests were re-calculated relative to the check cv. Altona, a quadratic equation between PA and chlorophyll accounted for nearly 90% of the variation. When photosynthetic rate was expressed on a unit chlorophyll basis (Pc), no significant differences among lines were established in the cultivar test. In the mutants test, significant differences in Pc were established with higher values of Pc associated with lower chlorophyll contents; a linear regression accounted for 45% of the variation. Transformation of the data from both experiments relative to Altona allowed the fitting of a common regression line (quadratic) which accounted for 63% of the variation. We suggest that initial screening of progenies in a breeding program for high photosynthetic rate could be done by measuring chlorophyll content.

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