Limitations for finding a linear relationship between chlorophyll content and photosynthetic activity

1966 ◽  
Vol 8 (4) ◽  
pp. 336-346 ◽  
Author(s):  
Zdeněk Šesták
Keyword(s):  
Linear Relationship ◽  
Chlorophyll Content ◽  
Photosynthetic Activity

scholarly journals Improvement of the photosynthetic activity of Moldavian dragonhead (Dracocephalum moldavica L.) through foliar application of a nitrophenolate–based biostimulant

2018 ◽  
Vol 10 ◽  
pp. 01009
Author(s):  
Sławomir Kocira ◽  
Agnieszka Sujak ◽  
Tomasz Oniszczuk ◽  
Agnieszka Szparaga ◽  
Mariusz Szymanek ◽  
...  
Keyword(s):  
Chlorophyll Content ◽  
Photosynthetic Activity ◽  
Foliar Application ◽  
Positive Impact ◽  
Abiotic Stress Tolerance ◽  
Photosynthetic Apparatus ◽  
Nutrient Content ◽  
Physiological Processes ◽  
Naturally Occurring ◽  
Reported Study

Application of biostimulants instigates many physiological processes that enhance nutrition efficiency, abiotic stress tolerance, and quality traits of crops, regardless of their nutrient content. One of such preparations is Atonik which contains nitrophenol compounds naturally occurring in plant cells. Several studies have confirmed its beneficial effect on the growth, development, and improved metabolic activity of plants. Therefore, it seems advisable to investigate the effect of Atonik preparation on the photosynthetic activity of Moldavian dragonhead (Dracocephalum moldavica L.). The reported study was carried out in 2014 in Perespa, Poland. Over the growing season, Atonik was foliar-applied at a dose of 0.3 L/ha (0.1%) and 0.6 L/ha (0.2%) by single and double spraying of plants. Chlorophyll content and nitrogen status (N) were estimated by a Chlorophyll Meter SPAD-502 Plus. The foliar application of Atonik was found to improve the efficiency of the photosynthetic apparatus and chlorophyll content in the leaves of Dracocephalum moldavica plants, but the results were dependent on biostimulant concentration and number of its applications, and on the date of measurement. To conclude, Atonik is an environmental-friendly preparation which has a positive impact on the metabolic processes of plants.

scholarly journals Variations of Chlorophyll Content at Abies alba and Nepeta pannonica Species According to Phenophase and Harvesting Area

2019 ◽  
Vol 52 (1) ◽  
pp. 74-78
Author(s):  
S. Buhăianu ◽  
Doina Carmen Jităreanu
Keyword(s):  
Chlorophyll Content ◽  
Chlorophyll A ◽  
Photosynthetic Pigments ◽  
Photosynthetic Activity ◽  
Abies Alba ◽  
Chlorophyll B ◽  
Green Color ◽  
Yellow Coloration ◽  
Chlorophyll A And B ◽  
Chlorophyll A Content

Abstract Chlorophylls from plants are photosynthetic pigments. Their quantity offers valuable informations about photosynthetic activity, growing and developing of plants. Photosynthetic pigments decrease quantitatively during senescence process or in stress conditions. The present study has been realized in laboratory conditions with material harvested from spontaneous flora. The purpose of this research was the investigation of variations of chlorophyll content from samples of biological material collected from Nepeta pannonica L. and Abies alba Mill. plants, from Câmpulung Moldovenesc and Cacica areas, Suceava county, Romania. The targeted phenophases were growth and flowering. There were realized acetonic extracts from samples for spectrophotometric determinations. Obtained data were processed to estabilish chlorophyll a and b content. There were observed that at Abies alba species, from both locations, the chlorophyll a content grew during flowering phenophase, while the chlorophyll b content had little variations. At Nepeta pannonica species, the chlorophyll a and b content decreased visibly during the flowering, due to stress. Leaves of plants from this species presented a intense green color in the growing phenophase, while during flowering phenophase they had a purple or yellow coloration. Obtained results revealed a different dynamics of chlorophyll content at studied species.

Variation in Chlorophyll a and b in the Seagrass Halodule in Central Visayas, Philippines

2014 ◽  
Vol 8 (1) ◽  
Author(s):  
BILLY THEODORUS WAGEY
Keyword(s):  
Chlorophyll Content ◽  
Chlorophyll A ◽  
Photosynthetic Activity ◽  
Light Availability ◽  
Experimental Manipulation ◽  
Marine Ecology ◽  
Chlorophyll A And B ◽  
Photosynthetic Performances ◽  
Plastic Responses ◽  
One Way Anova

Chlorophyll content of seagrass leaves varies among species and habitats byat least a factor of five, and shows plastic responses to seasonal variations in light availability as well as direct experimental manipulation. This study generally attempted to observe the relative amount of chlorophyll a, b content of Haloduleuninervis and Halodule pinifolia in Central Visayas, Philippines in relation tothese environmental factors which are: exposure, density, temperature, and lightintensity. Chlorophyll was determined using the equation of Jeffrey and Humprey(1975) whereas data gathered went through one way ANOVA followed byTukey’s Test. Significant variations were found in most photosynthetic parametersmeasured in this study. Overall, H. uninervis and H. pinifolia seems to obtainoptimal photosynthetic performances over a broad range of irradiances. Mainly,genus Halodule can be seen as a highlight species, which has also the ability to acclimate to low irradiances. in general, the result indicated that seagrasses tend to decrease the ratio of chlorophyll a:b by increasing the amount of chlorophyllb to compensate for the decline in light intensity in subtidal areas. Therefore, H.uninervis and H. pinifolia seem to have the ability of adjusting their chlorophyllcontent in performing optimal photosynthetic activity over a broad range of irradiance regimes.Keywords: Marine Ecology, chlorophyll content, seagrass, Halodule, experimental design,Philippines

scholarly journals Influence of Mycorrhiza and Phosphorus on Physiological Parameters of Leaves of Litchi (Litchi chinensis Sonn.) Layers

2020 ◽  
pp. 92-101
Author(s):  
Priyanka Kumari ◽  
R. R. Singh ◽  
Ruby Rani ◽  
Mahendra Singh ◽  
Uday Kumar
Keyword(s):  
Chlorophyll Content ◽  
Photosynthetic Activity ◽  
Arbuscular Mycorrhizal ◽  
Am Fungi ◽  
High Rate ◽  
Carotenoid Content ◽  
Litchi Chinensis ◽  
Initial Stage ◽  
Relative Water ◽  
Phosphorus Application

Litchi (Litchi chinensis Sonn.), is delicious juicy fruit of India having excellent nutritional quality. It has a great potential to earn foreign exchange in the national and international market through export. Slow plant growth and high rate of mortality in initial stage of plant establishment are the major problem of litchi. Increasing photosynthetic activity through exploiting photosynthetic, components are major target. The carotenoid and chlorophyll content are one of the major components that affect the photosynthetic activity of plant. Arbuscular mycorrhizal (AM) fungi are beneficial symbiotic soil microorganisms and AM technology can find its potential application in the nursery of horticultural industry. When AM fungi have been successfully applied to many wood fruit tree species, little information is available in litchi. Therefore, the pot experiment was undertaken to study the influence of phosphorus (50 mg and 75 mg), mycorrhiza (G. mosseae and G. coronatum) alone and in combination. The treatment significantly influenced the changes in chlorophyll and carotenoid content in leaves of litchi samplings in nursery stage. After 120 days of inoculation both the species of mycorrhiza alone and in combination with phosphorus application were very effective with the highest level of total chlorophyll content of (2.474 mg/g fr. wt) in case T5 G. mosseae 10 g + Phosphorus 50 mg. Significantly lowest value of chlorophyll was noted in T0 Control (2.090 mg/g fr.wt). Carotenoid content was also measured maximum in T5 G. mosseae 10 g + Phosphorus 50 mg (0.154 mg/g fr. wt.) as compare to T0 Control with (0.065 mg/g fr. wt.). Relative water content (RWC) after 60, 90 and 120 DAI significantly differentiate. Maximum RWC in case T5 G. mosseae 10 g + Phosphorus 50 mg (31.43%) which was statistically equal with G. coronatum 10 g + P 50 mg (31.14%). Significantly influencing specific leaf weight at different date of observations. The performance was maximum found in T5 G. mosseae 10 g + Phosphorus 50 mg (7.28%) as compare to T0 control (4.44%). Significant effect of treatments on leaf parameters of litchi layers pertaining number of leaves per flush and length of flush is maximum with T5 G. mosseae 10 g + Phosphorus 50 mg (5 - 8) and (10.2 cm).

scholarly journals Study of some physiologic properties of different genotype sweet corn hybrids

2012 ◽  
pp. 105-110
Author(s):  
Ádám Lente
Keyword(s):  
Leaf Area ◽  
Chlorophyll Content ◽  
Photosynthetic Activity ◽  
Plant Density ◽  
Sweet Corn ◽  
Nutrient Supply ◽  
Plant Production ◽  
Sowing Time ◽  
Area Index ◽  
Leaf Area Duration

The effect of nutrient-supply (control, N120+PK) and two different genotypes on the physiologic properties of sweet corn has been investigated in the crop-year of 2011 on chernozem soil in the Hajdúság region. The experiments were carried out at the Experimental Station of the University of Debrecen in Debrecen-Látókép. The experiment was sewn in two different sowing times: the 21st April can be considered as an early, while the 19th May as a late sowing time. The two involved hybrids were Jumbo and Enterprise. The applied plant density was 65 000 plants per hectare.Our aim with this experiment was to study the plant production, just as the main affecting factors of its development and dynamics, like nutrient-supply and genotypes. We aimed to study and analyse the relationships between these factors and plant production. In this study following parameters were measured and calculated: photosynthetic activity, chlorophyll-content (SPAD-value), leaf area index (LAI) and leaf area duration (LAD). Regarding the analysis of photosynthetic activity values no obvious relationship between the measured values and the applied hybrids, just as nutrient-supply has been revealed. Analysing the SPAD-values it can be stated that the chlorophyll-content of the measured leaves showed an increasing tendency due to the nutrient-supply. The highest values have been measured in the intensive cob development phase of the early sowing time plots.Regarding the LAI-values we have found significant differences between the fertilizer treatments in both sowing time treatments. In case of the leaf area duration values – that is derived from the LAI values – nutrient-supply has positively affected the duration of the assimilation area.

scholarly journals Field-portable Analysis of Anthocyanin Concentration in Sepals of Hydrangea macrophylla

HortScience ◽  
2007 ◽  
Vol 42 (6) ◽  
pp. 1323-1325 ◽  
Author(s):  
Henry D. Schreiber ◽  
Nicholas A. Wade
Keyword(s):  
Linear Relationship ◽  
Chlorophyll Content ◽  
Anthocyanin Content ◽  
Data Set ◽  
Hydrangea Macrophylla ◽  
Content Index ◽  
Anthocyanin Concentration

A field-portable method, adapting commercially available chlorophyll content meters, has been developed to measure the anthocyanin concentration in red and blue sepals of Hydrangea macrophylla. The meters were calibrated to total extractable anthocyanin concentration. The strength of the linear relationship (anthocyanin content index vs. extractable anthocyanin concentration) was better for red than blue sepals, due perhaps to the inclusion of purplish sepals in the blue data set or perhaps to more than one mechanism for the bluing of sepals. The meters were demonstrated to be an effective tool for the measurement of relative anthocyanin concentration in hydrangea sepals as a function of bloom stage.

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