Photosynthetic activity and growth analysis of the plant Costus spicatus cultivated under different light conditions

2008 ◽  
Vol 153 (1) ◽  
pp. 527-529 ◽  
Author(s):  
V. M. Campos ◽  
L. A.A.P. Pasin ◽  
P. R. Barja
Keyword(s):  
Growth Analysis ◽  
Photosynthetic Activity ◽  
Light Conditions

scholarly journals MORPHOLOGICAL AND PHYSIOLOGICAL PLASTICITY OF SAPLINGS OF Cabralea canjerana (Vell.) MART. IN DIFFERENT LIGHT CONDITIONS

2019 ◽  
Vol 43 (1) ◽  
Author(s):  
Anna Paula Lora Zimmermann ◽  
Frederico Dimas Fleig ◽  
Luciane Almeri Tabaldi ◽  
Suelen Carpenedo Aimi
Keyword(s):  
Leaf Area ◽  
Photosynthetic Activity ◽  
Dry Mass ◽  
Chlorophyll B ◽  
Light Conditions ◽  
Forest Fragment ◽  
Lower Content ◽  
Physiological Plasticity ◽  
Chlorophyll A And B ◽  
Number Of Leaves

ABSTRACT This work was carried out to verify the plasticity of saplings of Cabralea canjerana plants and their capacity to adapt to different light environments by means of morphological and physiological characteristics. For this, 12 plants of a secondary Deciduous Seasonal Forest fragment were selected, six growing under canopy and six in full sun. Trees were classified according to their sociological position as emergent and dominated. The leaves were classified as apical, intermediate and basal according to their position in the canopy. The variables measured were: total number of leaves, width, length, thickness, leaf area and dry mass of leaflets; content of chlorophyll a and b and carotenoids. Emergent leaflets of the upper position of the canopy in full sun, which are considered the most exposed to luminosity, presented xeromorphic characteristics such as leaflet size reduction, greater limbus thickness, smaller leaf area and lower content of chlorophyll b. The similarity in the dry mass and pigment content demonstrates that the photosynthetic activity of the C. canjerana plants analyzed is not being affected by the different conditions of the environment, which demonstrates the plasticity of the species and its capacity of development in several light conditions.

Growth responses of six bryophyte species to different light intensities

1993 ◽  
Vol 71 (5) ◽  
pp. 661-665 ◽  
Author(s):  
Emmanuel Rincón
Keyword(s):  
Growth Rate ◽  
Light Intensity ◽  
Growth Rates ◽  
Growth Analysis ◽  
Total Chlorophyll ◽  
Light Conditions ◽  
Growth Responses ◽  
Relative Growth ◽  
Relative Growth Rates ◽  
Plastic Responses

The growth responses of Brachythecium rutabulum, Eurhynchium praelongum, Lophocolea bidentata, Plagiomnium undulatum, Pseudoscleropodium purum, and Thuidiurn tamariscinum, growing under seven different light conditions, were determined in a 36-day laboratory experiment. Biomass production, relative growth rate, chlorophyll content, and morphological plastic responses (bending of the shoots) were determined following initial and final harvests. All species achieved greater biomass as irradiance increased. This trend was also observed in the relative growth rates, which were higher as irradiance increased, for all the bryophytes investigated. All species except L. bidentata showed an increased elevation of the shoot as irradiance decreased. Total chlorophyll was higher in all species at the lowest irradiance level, but no clear differences were observed in the ratios of chlorophyll a to b for all the species. Key words: grassland bryophytes, light intensity, growth analysis, plasticity.

Some physiological aspects of growth and yield in wheat crops: a comparison of a semidwarf and a standard height cultivar

1976 ◽  
Vol 16 (81) ◽  
pp. 578 ◽  
Author(s):  
JJ Walcott ◽  
DR Laing
Keyword(s):  
Field Experiment ◽  
Water Deficit ◽  
Grain Growth ◽  
Growth Analysis ◽  
Photosynthetic Activity ◽  
Growth And Yield ◽  
Grain Production ◽  
Lodging Resistance ◽  
Nitrogen Levels

A field experiment showed the semidwarf cultivar Penjamo 62 to outyield the taller Australian cultivar Gamenya at nitrogen levels up to 896 kg N ha-1. This was attributed primarily to a faster rate of grain growth particularly in the later stages. Lodging resistance of Penjamo 62 accounted for only 16-58 per cent of the differences observed at the lower nitrogen levels. Although these two cultivars showed only small differences in both photosynthesis and in the duration of photosynthetic activity of microplots in the greenhouse, large differences in the efficiency of utilization of post-anthesis photosynthesis for grain production were inferred from growth analysis. Moreover, grain growth of Penjamo 62 was far more sensitive to a post-anthesis drought than that of Gamenya, even though similar levels of water deficit and reductions in photosynthesis were recorded in microplots of both cultivars.

Dynamics of the potential photosynthetic activity of marine phytoplankton during illumination change in the North Atlantic

2019 ◽  
pp. 35-45
Author(s):  
Sergey A. Mosharov ◽  
Irina V. Mosharova
Keyword(s):  
Surface Layer ◽  
North Atlantic ◽  
Photosynthetic Activity ◽  
Vertical Mixing ◽  
Experimental Studies ◽  
Marine Phytoplankton ◽  
Light Conditions ◽  
Illumination Change ◽  
The North ◽  
The North Atlantic

The results of experimental studies of the magnitude and rate of variability of the potential photosynthetic activity of marine phytoplankton under variations in light conditions simulating the vertical mixing of phytoplankton within the euphotic layer are considered. It has been shown that photoinhibition of phytoplankton in the surface layer occurs fairly quickly, but is reversible with mixing of water.

Photosynthetic efficiency of endosymbiotic algae of Paramecium bursaria originating from locations with cold and warm climates

2018 ◽  
Vol 47 (2) ◽  
pp. 202-210
Author(s):  
Katarzyna Możdżeń ◽  
Patrycja Z. Leśnicka ◽  
Tomasz Burnecki ◽  
Sylwia Śliwińska-Wilczewska ◽  
Andrzej Skoczowski ◽  
...  
Keyword(s):  
Photosynthetic Activity ◽  
Cold Climate ◽  
Paramecium Bursaria ◽  
Control Group ◽  
Constant Darkness ◽  
Light Conditions ◽  
Warm Climate ◽  
Symbiotic Algae ◽  
Different Temperatures ◽  
Endosymbiotic Algae

Abstract Paramecium bursaria (Ciliophora) is a cosmopolitan unicellular organism that plays a significant role in aquatic ecosystems. P. bursaria contains symbiotic algae and this association is a mutual symbiosis. The aim of the present study was to determine the activity of photosystem II (PSII) in Chlorella sp. inside P. bursaria cells. Ciliates were incubated for 7 days at different temperatures from 6 to 18°C, under the circadian cycle: 12 h light/12 h dark, at light intensity of 200 μmol m-2 s-1 and under constant darkness conditions. The control group was kept at a temperature of 18°C under constant light conditions. Changes in PSII were monitored using different fluorescence parameters. Differences in responses between endosymbiotic algae of two P. bursaria strains – Ard7 from a warm climate and KD64 from a cold climate – were determined. The highest photosynthetic activity of P. bursaria green endosymbionts was observed at a temperature of 18°C, regardless of the light conditions. Algae from warm climate were more sensitive to cold temperature stress than algae from P. bursaria collected in cold climate.

scholarly journals Growth Analysis of Potted Seedlings of Satsuma Mandarin (Citrus unshiu Marc.) under Different Light Conditions and Air Temperatures

2018 ◽  
Vol 87 (1) ◽  
pp. 34-42 ◽  
Author(s):  
Taku Yano ◽  
Akiyoshi Morisaki ◽  
Kimiaki Matsubara ◽  
Shun-ichiro Ito ◽  
Masaharu Kitano
Keyword(s):  
Growth Analysis ◽  
Citrus Unshiu ◽  
Light Conditions ◽  
Satsuma Mandarin ◽  
Air Temperatures

Light regulating metabolic responses of Cyanobium sp. (Cyanobacteria)

2020 ◽  
Vol 193 (4) ◽  
pp. 285-297 ◽  
Author(s):  
Fernando Pagels ◽  
José Bonomi Barufi ◽  
Julia Vega ◽  
Roberto Abdala-Díaz ◽  
Vitor Vasconcelos ◽  
...  
Keyword(s):  
Antioxidant Capacity ◽  
Photosynthetic Activity ◽  
Processing Parameters ◽  
Light Sources ◽  
Light Conditions ◽  
Light Irradiance ◽  
Important Group ◽  
Bg11 Medium ◽  
P Concentration ◽  
Sodium Lamp

Cyanobacteria are an important group of microorganisms of significant economic interest due to, for ex- ample, the antioxidant capacity of their metabolites. Cyanobium sp. LEGE 06113 is a marine cyanobacterium poorly studied, but with promising future applications. The aim of this study was to optimize the light conditions (both source and irradiance) and nutrient (N and P) concentration for Cyanobium sp. production as a source of high-valued com- pounds. The optimization of the processing parameters was performed using two different light sources (fluorescent and low-pressure sodium lamp), four irradiances (50, 100, 200 and 300 μmol photons m–2 s–1) and two variations of BG11 medium (BG11 and BG11+, with the second containing double amounts of phosphates and nitrates). The effects of the three factors were evaluated on the biomass production, photosynthetic activity, biochemical composition and antioxidant capacity. A synergistic effect between the light source, light intensity, and medium was observed for all measured parameters, with the greatest impact of light irradiance on the metabolism of Cyanobium sp. The combination of the SOX lamp, BG11+ medium, and a light irradiance of 200 μmol photons m–2 s–1 was optimal for the cultivation of Cyanobium sp. This work reports the tools for the production of Cyanobium sp. as a source of high-value products, thus increasing its biotechnological potentials.

scholarly journals CP12 Is Involved in Protection against High Light Intensity by Suppressing the ROS Generation in Synechococcus elongatus PCC7942

Plants ◽  
2021 ◽  
Vol 10 (7) ◽  
pp. 1275
Author(s):  
Masahiro Tamoi ◽  
Shigeru Shigeoka
Keyword(s):  
Oxidative Stress ◽  
Photosynthetic Activity ◽  
Regulatory System ◽  
High Light Intensity ◽  
High Light ◽  
Ros Generation ◽  
Light Conditions ◽  
Low Light ◽  
Oxidative Stresses ◽  
Synechococcus Elongatus Pcc7942

We previously reported that CP12 formed a complex with GAPDH and PRK and regulated the activities of these enzymes and the Calvin–Benson cycle under dark conditions as the principal regulatory system in cyanobacteria. More interestingly, we found that the cyanobacterial CP12 gene-disrupted strain was more sensitive to photo-oxidative stresses such as under high light conditions and paraquat treatment. When a mutant strain that grew normally under low light was subjected to high light conditions, decreases in chlorophyll and photosynthetic activity were observed. Furthermore, a large amount of ROS was accumulated in the cells of the CP12 gene-disrupted strain. These data suggest that CP12 also functions under light conditions and may be involved in protection against oxidative stress by controlling the flow of electrons from Photosystem I to NADPH.

scholarly journals Preliminary investigation on the interaction between some physiological processes in donors and acceptors of assimilates

2015 ◽  
Vol 42 (1) ◽  
pp. 143-162 ◽  
Author(s):  
Z. Starck
Keyword(s):  
Photosynthetic Activity ◽  
Dark Respiration ◽  
Sugar Content ◽  
Preliminary Investigation ◽  
Extended Period ◽  
Natural Light ◽  
Light Conditions ◽  
Physiological Processes ◽  
Bean Plants ◽  
P Absorption

The interaction between physiological processes in donors and acceptors of <sup>14</sup>C-assimilates was studied in sunflower and bean plants with temporarily limited supply of assimilates (shading a few days and then replacing in natural light conditions (NL)). An extended period of shading (4-7 days) affected growth of plants and reduced photosynthetic activity, especially in sunflower. The proportion of <sup>14</sup>C-transported to roots decreased and that to the stern increased as an effect of preshading and did not significantly change in plants replaced in natural light conditions a few days before <sup>14</sup>CO<sub>2</sub>-exposure. In preshaded blades and roots the rate of dark respiration decreased, but soon improved after a few days of NL conditions following the shading period. Absorption of <sup>32</sup>P coincided with root respiration and sugar content in bean plant, in contrast to sunflower where <sup>32</sup>P-absorption, calculated per l g of root dry matter in preshaded plants exceeded that in control ones.

scholarly journals Photosynthetic Responses of Anthurium × ‘Red’ under Different Light Conditions

Plants ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 857
Author(s):  
Lingyan Chen ◽  
Muhammad Waqqas Khan Tarin ◽  
Heqiang Huo ◽  
Yushan Zheng ◽  
Jianjun Chen
Keyword(s):  
Photosynthetic Activity ◽  
Chlorophyll Concentration ◽  
Photon Flux ◽  
Total Chlorophyll ◽  
Light Conditions ◽  
Photosynthetic Photon Flux ◽  
Low Light ◽  
Plant Photosynthesis ◽  
Photosynthetic Responses ◽  
Indoor Conditions

Light is an essential energy source for plant photosynthesis, although it can also be a stress-causing element. Therefore, the current research was aimed to compare photosynthetic responses of Anthurium × ‘Red’ leaves at different positions (bottom old leaf, 1; center mature leaf, 2; top expanded leaf, 3) established under three photosynthetic photon flux densities (PPFDs): 550 μmol·m−2·s−1 as high (H), 350 μmol·m−2·s−1 as medium (M), and 255 μmol·m−2·s−1 as low (L). After six months, all the replicates were relocated to interior rooms with a PPFD of 30 μmol·m−2·s−1. There were no significant differences in chlorophyll concentration of the old leaf among treatments, before (Day 0) and after shifting the plants to interior rooms (Day 30). The total chlorophyll concentrations of the mature and top leaves increased significantly. In greenhouse conditions, H and M treatments did not show any significant change for net photosynthetic rate (Pn) at various leaf positions. However, M2 exhibited an improved Pn in the interior conditions. Plants grown under M treatment were greener and had bigger leaves compared to other treatments. Our study reveals that Anthurium × ‘Red’ photosynthesis responses to different light conditions varied distinctly. However, M treatment can keep the plants looking green by accumulating enough energy for indoor conditions, and middle and lower leaves may be triggered to restore photosynthetic activity under low light or indoor conditions.

Sign in / Sign up

Export Citation Format

Share Document