Chlorophyll Mutations in Barley

Holm, Gerhard

doi:10.1080/00015125409439955

Cited by 339 publications

(167 citation statements)

References 23 publications

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“…Gallic acid was used as an external standard and the concentration of total phenols, flavonoids, and non-flavonoids was expressed as mg g -1 of the aqueous extract. The content of total chlorophylls (chlorophyll a and chlorophyll b) and total carotenoids were determined by Holm (1954) and Wettstein (1957). The sample was weighed into a test tube and 10 ml of acetone was added.The solution prepared in this way was homogenized with a laboratory homogenizer (IKA, UltraTurax T-18, Germany).…”

Section: Methodsmentioning

confidence: 99%

Ultrasound-assisted extraction of bioactive compounds from lemon balm and peppermint leaves

Žlabur¹,

Voća²,

Dobričević³

et al. 2016

International Agrophysics

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A b s t r a c t. The aim of this study was to investigate the influence of conventional and ultrasound-assisted extraction (frequency, time, temperature) on the content of bioactive compounds as well as on the antioxidant activity of aqueous extracts from fresh lemon balm and peppermint leaves. Total phenols, flavonoids, non-flavonoids, total chlorophylls, total carotenoids, and radical scavenging capacity were determined. Moreover, the relationship between bioactive compounds and antioxidant capacity was studied by linear regression. A significant increase in all studied bioactive compounds during ultrasonic extraction for 5 to 20 min was found. With the classical extraction method, the highest amounts of total phenols, flavonoids, and antioxidant activity were determined, and the maximum amounts of total chlorophylls and carotenoids were determined during 20 min ultrasonic extraction. The correlation analysis revealed a strong, positive relationship between antioxidant activity and total phenolic compounds.

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Section: Methodsmentioning

confidence: 99%

Ultrasound-assisted extraction of bioactive compounds from lemon balm and peppermint leaves

Žlabur¹,

Voća²,

Dobričević³

et al. 2016

International Agrophysics

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“…This relationship changed only slightly throughout the study (monthly mean mg Chl g dry weight-', n = 3-4, from June to December 1979: 1.0, 1.0, 0.8, 1.3, 1.3, 1.3, 1.6). Chl was determined according to the method of Holm (7).…”

Section: Methodsmentioning

confidence: 99%

Crassulacean Acid Metabolism in the Epiphyte Tillandsia usneoides L. (Spanish Moss)

Martin

Siedow²

1981

Plant Physiol.

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Patterns of CO2 exchange in Spanish moss under various experimental conditions were measured using an infrared gas analysis system. Plants were collected from a study site in North Carolina and placed in a gas exchange chamber for several days of continuous measurements. No substantial seasonal effects on CO2 exchange were observed. High rates of nocturnal CO2 uptake were observed under day/night temperature regimes of 25/10, 25/15, 25/20, 30/20, and day/night cycle) did not realistically approximate field conditions; and they used glasshouse-grown Spanish moss of unstated origin. It was the purpose of this study to examine CO2 exchange of field-collected Spanish moss in the laboratory, using controlled conditions which approximated those found in the field in North Carolina. Such controlled experiments should help explain the results of the field studies (14). MATERIALS AND METHODSNet CO2 exchange in strands of Spanish moss (Tillandsia usneoides L.) sealed in a chamber was monitored continuously during 4-to 6-day intervals with a Beckman IR215 Infrared Gas Analyzer (differential; open system) from June to December 1979. The CO2 concentration of the incoming air was approximately 360 ptl -. I and varied up to 50 ttl -I`on a diurnal basis; however, the changes in CO2 concentration were too gradual to be detected by the analyzer in the differential mode. Before analysis, the air was dried by condensation and passage through ZnCl2. Calibrations of the IR gas analyzer were made frequently.The air stream was humidified by passage through water and its dew point determined with an EG&G Model 880 dew point hygrometer. All tubing in the system was Tygon. Air flowed into the plant chamber at a rate of 500 ml-min-'. The chamber was a double-walled glass column approximately 45 cm long, with an inner diameter of 2.5 cm and a total inner volume of 250 ml. The double wall acted as a water jacket which allowed precise control of chamber air temperatures. Gaastra (5) has discussed a potential problem in the use of long, tubular chambers. Calculations based on maximal rates of CO2 exchange observed in Spanish moss found the problem of linearly changing CO2 concentration as the air flows over the plant due to CO2 exchange by the plant to be insignificant given the very low CO2 exchange rates of Spanish moss.Lighting was provided by a 400 w multi-vapor high intensity 335 www.plantphysiol.org on May 11, 2018 -Published by Downloaded from

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“…The results were expressed as mM Trolox equivalents (TE) per 1000 g of fresh weight (FW). The total carotenoids were determined by spectrometry at a wavelength of 440 nm, using a Jenway 6100 (GB) spectrophotometer and expressed as µg•g -1 of FW, according to Holm (1954). Data were compared using analysis of variance (ANOVA) at a significance level of p < 0.05.…”

Section: Evaluation Of Yield Nutrition's and Statistical Analysismentioning

confidence: 99%

Effect of Bacterial-algal Biostimulant on the Yield and Internal Quality of Lettuce (Lactuca sativa L.) Produced for Spring and Summer Crop

Kopta

Pavlíková

Sękara

et al. 2018

Not Bot Horti Agrobo

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Plant biostimulants can enhance crop nutrition status, stress tolerance, yield and quality in environment-friendly manner. The aim of this study was to determine the effect of an algae and bacteria preparations on the yield and nutritional parameters of leaf and romaine lettuce cultivated for spring and summer crop. The application of a combined biostimulant consisting of plant growth-promoting bacteria (Bacillus licheniformis, Bacillus megatherium, Azotobacter sp., Azospirillum sp., and Herbaspirillum sp.) and fresh water algae (Chlorella vulgaris) was done by watering the lettuce every 14 days, and a determination of the fresh weight, total antioxidant capacity, and total carotenoids content was performed. The result revealed that the application of bacterial-algal preparation significantly affected the plant weight of both romaine and leaf lettuce in spring and summer seasons. The highest increase in the weight of romaine lettuce reached 18.9% in the spring crop, while in the case of leaf lettuce, biostimulant treatment led to a 22.7% higher weight in the summer crop. Total antioxidant capacity and total carotenoids content showed increased values in the summer crop of romaine lettuce, while for the leaf lettuce there were no differences between treatments. Therefore, the positive effect of bacterial-algal treatment on lettuce yield, total antioxidant capacity and total carotenoids confirm that it could be applied for improving romaine lettuce yield quality and quantity, especially in stress, summer conditions.

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Chlorophyll Mutations in Barley

Cited by 339 publications

References 23 publications

Ultrasound-assisted extraction of bioactive compounds from lemon balm and peppermint leaves

Ultrasound-assisted extraction of bioactive compounds from lemon balm and peppermint leaves

Crassulacean Acid Metabolism in the Epiphyte Tillandsia usneoides L. (Spanish Moss)

Effect of Bacterial-algal Biostimulant on the Yield and Internal Quality of Lettuce (Lactuca sativa L.) Produced for Spring and Summer Crop

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