scholarly journals Ontogeny of Photosynthetic Performance in Fragaria virginiana under Changing Light Regimes

1979 ◽  
Vol 63 (3) ◽  
pp. 542-547 ◽  
Author(s):  
Thomas W. Jurik ◽  
Jean F. Chabot ◽  
Brian F. Chabot
Keyword(s):  
Photosynthetic Performance ◽  
Light Regimes ◽  
Fragaria Virginiana ◽  
Changing Light

Photosynthetic potential of sun and shade Viola species

1984 ◽  
Vol 62 (6) ◽  
pp. 1273-1278 ◽  
Author(s):  
William F. Curtis
Keyword(s):  
Dark Respiration ◽  
Photosynthetic Performance ◽  
Light Conditions ◽  
Low Light ◽  
Light Regimes ◽  
Photosynthetic Plasticity ◽  
Photosynthetic Potential ◽  
Photosynthetic Responses ◽  
Sun And Shade ◽  
Meadow Species

The photosynthetic responses of a forest floor violet (Viola blanda) and a related meadow species (Viola flmbriatula) grown under controlled conditions were measured to test the prediction that these two species were photosynthetically shade and sun adapted, respectively. Based on their low photosynthetic and dark respiration rates, and low light saturation and compensation points, both violets can be classified as shade-tolerant. The forest species was photosynthetically and morphologically inflexible when grown under high light conditions, which led to chlorosis and greatly decreased photosynthetic performance. Conversely, the meadow species was both photosynthetically and morphologically flexible; its photosynthetic performance allowed it to grow well under both high and low light regimes. As a consequence, morphological flexibility may play a greater role than physiological (i.e., photosynthetic) plasticity in regulating the distribution of these two violets under field conditions.

scholarly journals Influence of Photoperiods on Microalgae Biofilm: Photosynthetic Performance, Biomass Yield, and Cellular Composition

Energies ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3724 ◽  
Author(s):  
Xinru Zhang ◽  
Hao Yuan ◽  
Libo Guan ◽  
Xinyu Wang ◽  
Yi Wang ◽  
...  
Keyword(s):  
Biomass Yield ◽  
Low Cost ◽  
Biomass Productivity ◽  
Chlorella Pyrenoidosa ◽  
Photosynthetic Performance ◽  
Light Regimes ◽  
Chlorella Sp ◽  
Relative Electron Transport Rate ◽  
Relative Electron ◽  
Immense Potential

Microalgae have immense potential as biological sources to produce biofuels and high-value biomolecules. Biofilm-based microalgae cultivation has attracted much interest recently because of its high biomass productivity, reduced water use, and low cost of harvesting. This study aimed to understand the effect of photoperiod on three microalgae biofilms, including Nannochloris oculata, Chlorella sp., and Chlorella pyrenoidosa. The examined photoperiods were 3:3 s, 5:5 s, 30:30 min, 12:12 h (light-period-to-dark-period ratio), and continuous lighting. By determining the maximum quantum yield and relative electron transport rate of photosystem II, we found that photoperiods on the seconds scale improved photosynthetic performance of microalgae biofilm. Biomass yield and lipid content of these three microalgae cultured under the photoperiod with the seconds scale increased by 11%–24% and 7%–22%, respectively, compared with those cultured under continuous lighting. In addition, the photoperiods of 3:3 s, 5:5 s, 30:30 min, and 12:12 h were beneficial for protein synthesis. These results have important implications in establishing suitable light regimes for microalgae biofilm-based cultivation systems.

Photosynthetic performance and light response of two olive cultivars under different water and light regimes

2009 ◽  
Vol 47 (4) ◽  
pp. 602-608 ◽  
Author(s):  
A. Sofo ◽  
B. Dichio ◽  
G. Montanaro ◽  
C. Xiloyannis
Keyword(s):  
Light Response ◽  
Photosynthetic Performance ◽  
Light Regimes ◽  
Olive Cultivars

The effect of rapidly changing light on the rate of photosynthesis in largetooth aspen (Populus grandidentata)

1970 ◽  
Vol 48 (4) ◽  
pp. 823-829 ◽  
Author(s):  
D. F. W. Pollard
Keyword(s):  
Bright Light ◽  
Net Photosynthesis ◽  
Ventilation Rate ◽  
Light Regimes ◽  
Fluctuating Irradiance ◽  
Rate Of Photosynthesis ◽  
Light Flecks ◽  
Four Levels ◽  
Forest Floors ◽  
Changing Light

Net photosynthesis by largetooth aspen was measured at each of four levels of irradiance, 3.4, 8.2, 22.6 and 73.1 W m−2 (0.4–0.7 μ), and during interchange of equal periods of these same levels. The periods between interchange ranged from about 0.2 to 300 s. All measurements were made between 17 and 19 °C; ventilation rate across leaves was equivalent to 1.5 m s−1. Photosynthesis was lower during interchange of long periods; depending on the irradiance levels selected, shorter periods led to increases in photosynthesis of up to 50%. Sometimes a recovery in photosynthesis occurred with the longest periods. The greatest changes were observed when one irradiance sequence was well below saturation level and the other was at or above saturation. Measurements of light regimes in three forest types showed that, during moderate winds at least, fluctuations with periods of between 0.1 and 100 s are commonplace. However, the effects of fluctuating irradiance on net photosynthesis may be important for growth and regeneration only where canopy height and spacings result in bright light flecks on other wise dark forest floors.

scholarly journals Phenotypic plasticity in Passiflora suberosa L.(Passifloraceae): induction and reversion of two morphs by variation in light intensity

2006 ◽  
Vol 66 (3) ◽  
pp. 853-862 ◽  
Author(s):  
E. A. Barp ◽  
G. L. G. Soares ◽  
G. Gosmann ◽  
A. M. Machado ◽  
C. Vecchi ◽  
...  
Keyword(s):  
Phenotypic Plasticity ◽  
Light Stress ◽  
Genotypic Diversity ◽  
First Year ◽  
Light Regimes ◽  
Cellular Hypertrophy ◽  
Cell Layers ◽  
Proximate Causes ◽  
Second Year ◽  
Changing Light

Leaf morphology may vary considerably even within a branch of Passiflora suberosa plants. Leaves are of a typical green type in shaded areas, but in open fields turn into violet, and apparently have greater thickness and trichome density. The proximate causes and the adaptive meaning, if any, for the existence of the violet morph are still unknown. By cultivating P. suberosa clones under two light regimes (total and partial exposure to sunlight), we consecutively induced (first year) and then reversed (second year) the appearance of the violet morph. We evaluated the corresponding changes in morpho-anatomic and chemical leaf characteristics. Plants that were grown under partial sunlight had a greater size and did not alter their green color, but those grown under total sunlight changed into violet, were smaller in size and their leaves were tougher, thicker, and had a greater number of trichomes. The violet morph had increased anthocyanins and phenolic derivatives. It also showed cellular hypertrophy, a greater number of cell layers in the mesophyll, and a lignified pericycle. Since these morphs are interchangeable by changing light conditions, we inferred that they are not determined by genotypic diversity, but are mainly a result of a physiological response to light stress, and thus part of P. suberosa phenotypic plasticity.

scholarly journals Transcriptional response of the photoheterotrophic marine bacterium Dinoroseobacter shibae to changing light regimes

2011 ◽  
Vol 5 (12) ◽  
pp. 1957-1968 ◽  
Author(s):  
Jürgen Tomasch ◽  
Regina Gohl ◽  
Boyke Bunk ◽  
Maria Suarez Diez ◽  
Irene Wagner-Döbler
Keyword(s):  
Marine Bacterium ◽  
Transcriptional Response ◽  
Light Regimes ◽  
Dinoroseobacter Shibae ◽  
Changing Light

Decreasing water pressure cues ‘bailout’ in seaweed-associated crustaceans

2020 ◽  
Vol 653 ◽  
pp. 121-129
Author(s):  
RB Taylor ◽  
S Patke
Keyword(s):  
Water Pressure ◽  
Rapid Change ◽  
Brown Seaweed ◽  
Model System ◽  
Rate Of Change ◽  
Suitable Habitat ◽  
Changing Light ◽  
Surface Increase ◽  
Reduced Water ◽  
Transparent Chamber

Small mobile crustaceans are abundant on seaweeds. Many of these crustaceans rapidly abandon their host if it is detached from the seafloor and floats towards the surface, but the trigger for this ‘bailout’ behaviour is unknown. We tested 2 potential cues, i.e. rapid change in light and rapid change in water pressure, using >1 mm epifauna on the brown seaweed Carpophyllum plumosum as a model system. Bailout occurred in response to reduced water pressure, but not to changing light, as (1) bailout occurred at similar rates in light and dark, (2) bailout occurred on the seafloor when water pressure was reduced within a transparent chamber by the equivalent of ~0.5 m depth or more, and (3) little bailout occurred when water pressure was held constant within the chamber while seaweeds were raised to the surface. Increase in pressure (simulating sinking) did not induce bailout. The rate of bailout increased with increasing magnitude of pressure reduction but was not influenced greatly by the rate of change of pressure within the range tested (up to an equivalent of 0.4 m depth s-1). The use of pressure rather than light as a cue for bailout is consistent with the need for seaweed-associated crustaceans to rapidly abandon a detached host and relocate to suitable habitat during both day and night.

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