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REFERENCES Arif C, Setiawan B, Mizoguchi M, Doi R (2012): Estimation of soil moisture in paddy field using Artificial Neural Networks. International Journal of Advanced Research in Artificial Intelligence, 1, 17–21. doi:10.14569/IJARAI.2012.010104. Bannari A, Khurshid KS, Staenz K, Schwarz J (2008): Potential of Hyperion EO-1 hyperspectral data for wheat crop chlorophyll content estimation. Canadian Journal of Remote Sensing, 34, S139–S157. doi:10.5589/m08-001. Bei CUI, Qian-jun Z, Wen-jiang H, Xiao-yu S, Hui-chun YE, Xian-feng Z (2018): Leaf chlorophyll content

References 1. Akhter, M.M., Hosain, A., Timsina, J., Teixeira da Silva, A., & Islam, M.S. (2016). Chlorophyll meter – a decision-making toll for nitrogen application in wheat under light soils. International Journal of Plant Production 10 (3), 289–302. DOI: 10.22069/ijpp.2016.2898. 2. Bojovič, B. & Markivič, A. (2009). Correlation between nitrogen and chlorophyll content in wheat ( Triticum aestivum L.). Kragujevac Journal of Science , 31, 69–74. 3. Bojovič, B & Stojanovič, J. (2005). Chlorophyll and carotenoid content in wheat cultivars as a function of

REFERENCES Afeefa, Q. S. , Pandit, A.K. & Ganai, B.A. (2017). Seasonal variation in chlorophyll content of some selected plant species of Yousmarg grassland ecosystem. Asian J.Plant Sci.Res., 7(2): 33-36. Ashraf, M. & Harris, P.J.C. (2013). Photosynthesis under stressful environments : An overview. Photosynthetica , 51(2): 163-190. Jităreanu, D.C. & Toma, L.D. (2007). Fiziologie vegetală. Edit. Ion Ionescu de la Brad , Iaşi. Khaleghi, E., Arzani, K., Moallemi, N. & Barzegar, M. (2012). Evaluation of chlorophyll content and chlorophyll fluorescence

Abstract

Borage is a valuable medicinal plant with various constituents in leaves, flowers and seeds. Hence, it is important to improve the performance of this medicinal plant under different environmental conditions. Thus, two field experiments were arranged as split-plots based on a RCB design with three replications in 2012 and 2013, to evaluate the effects of seed priming and different irrigation intervals on selected physiological properties of borage leaves. Irrigation intervals (irrigation after 60, 90, 120, 150 mm evaporation from Class A pans, respectively) and priming treatments (control, water, KNO3 and KH2PO4) were allocated to the main and sub plots, respectively. The chlorophyll content index was enhanced under limited irrigation treatments, mainly due to a decrease in leaf area index and intercepting more radiation. However, the membrane stability index was stable under different irrigation intervals. Decreased relative water content and leaf area index and increased leaf temperature under lower water availability led to some reductions in the grain yield of borage. All of the priming techniques, particularly hydro-priming, enhanced the seedling emergence rate, leaf area index and consequently grain yield per unit area. Therefore, seed hydro-priming can be used to improve the field performance of borage, particularly when sufficient water is available.

composition and biological activity of leaf exudates from some Lamiaceae plants. Die Pharmazie, 50(1): 62-65. Senevirathne, M., Kim, S.-H., Siriwardhana N., Ha, J.-H., Lee, K.-W. & Jeon Y.-J. (2006). Antioxidant potential of Ecklonia cava on reactive oxygen species scavenging, metal chelating, reducing power and lipid peroxidation inhibition. Food Sci.Technol., 12: 27-38, DOI: 10.1177/1082013206062422 Sheikh, A.Q. , Pandit A.K. & Ganai, B.A. (2017). Seasonal variation in chlorophyll content of some selected plant species of Yousmarg grassland ecosystem. Asian J

INTRODUCTION Chlorophyll (C 55 H 72 O 5 N 4 Mg), the pigment that gives green colour to the plants, has a vital role in photosynthesis and plant growth. It is found in the plants’ chloroplasts and is responsible to convert carbon dioxide and water into carbohydrates (food) and oxygen by using sunlight. In other words, it is the basic unit of plant energy systems. During photosynthesis, sunlight is captured by chlorophyll which allows plants to do photosynthesis and grow. Chlorophyll content of plants is highly influenced by light quality, mineral nutrition and

Abstract

An effective way to reduce nitric oxide emissions may be to reduce the level of nitrogen fertilization. Specialized formulations such as biostimulators are a good alternative to conventional mineral fertilization. The aim of the study was to determine the effect of the application of biostimulation agents (Asahi SL, Kelpak SL, Tytanit) applied against the limited dose of nitrogen (75 kgN·ha−1) on winter wheat ‘Muszelka’, their effect was measured on the parameters: grain yield, protein content, amount of chlorophyll and root mass. No statistically significant changes in yields were observed, but after application of the Asahi SL and Kelpak SL, considerably higher values were found as compared to the controls. It should be emphasised that the applied formulations significantly affected the root mass and chlorophyll content of the leaves. Especially in the case of roots of the plants where the biostimulator Asahi was used in the phase BBCH 37, Kelpak in BBCH 23 and fertilizer Tytanit in BBCH 37. And in the case of chlorophyll objects, where Tytanit was applied in BBCH 37 and 69. In the study, significant correlation was found only between the chlorophyll content and the root mass (r = 0.54).

sem-edax characterisation of deposited particles, Physics, Chemistry and Technology, 8, 1 (2010) 1-13. 18. Vangronsveld J, Clijsters H.: Toxic effects of metals, in: Plant and the Chemical Elements: Biochemistry, Uptake, Tolerance and Toxicity, ed. M.E. Farago, VCH Verlagsgesellschaft, Weinheim, 1994, 150-177. 19. Vassilev A., Berova M., Zlatev Z.:. Influence of Cd2+ on growth, chlorophyll content and water relations in young barley plants. Biologia Plantarum 41, 4 (1998) 601-606. 20. VDI, Biological Measuring Techniques for the Determination and Evaluation of

Abstract

Three plant species were assessed in this study - ozone-sensitive and -resistant tobacco, ozone-sensitive petunia and bean. Plants were exposed to ambient air conditions for several weeks in two sites differing in tropospheric ozone concentrations in the growing season of 2009. Every week chlorophyll contents were analysed. Cumulative ozone effects on the chlorophyll content in relation to other meteorological parameters were evaluated using principal component analysis, while the relation between certain days of measurements of the plants were analysed using multivariate analysis of variance. Results revealed variability between plant species response. However, some similarities were noted. Positive relations of all chlorophyll forms to cumulative ozone concentration (AOT 40) were found for all the plant species that were examined. The chlorophyll b/a ratio revealed an opposite position to ozone concentration only in the ozone-resistant tobacco cultivar. In all the plant species the highest average chlorophyll content was noted after the 7th day of the experiment. Afterwards, the plants usually revealed various responses. Ozone-sensitive tobacco revealed decrease of chlorophyll content, and after few weeks of decline again an increase was observed. Probably, due to the accommodation for the stress factor. While during first three weeks relatively high levels of chlorophyll contents were noted in ozone-resistant tobacco. Petunia revealed a slow decrease of chlorophyll content and the lowest values at the end of the experiment. A comparison between the plant species revealed the highest level of chlorophyll contents in ozone-resistant tobacco.

Rolniczej w Szczecinie 181: 119–123. [in Polish with English abstract] Gregorczyk A., Raczyńska A., Pacewicz K. 1998. Analysis of standardization curves of chlorophyll content for the basic grain species. Biuletyn Magnezologiczny 3(1): 19–21. [in Polish with English abstract] Henschke M. 2014. Ornamental grasses – a new group of plants for urban greenery. In: Kosmala M. (Ed.), Kierunki zmian terenów zieleni w miastach, Toruń, Poland, pp. 377–398. [in Polish with English abstract] Howard K.W.F., Maier H. 2007. Road deicing salt as a potential constraint on urban growth in