scholarly journals Leaf Morphology, Photosynthetic Performance, Chlorophyll Fluorescence, Stomatal Development of Lettuce (Lactuca sativa L.) Exposed to Different Ratios of Red Light to Blue Light

2016 ◽  
Vol 7 ◽  
Author(s):  
Jun Wang ◽  
Wei Lu ◽  
Yuxin Tong ◽  
Qichang Yang
Keyword(s):  
Chlorophyll Fluorescence ◽  
Blue Light ◽  
Lactuca Sativa ◽  
Leaf Morphology ◽  
Red Light ◽  
Photosynthetic Performance ◽  
Stomatal Development ◽  
Lactuca Sativa L

scholarly journals Effect of Acetaminophen (APAP) on Physiological Indicators in Lactuca sativa

Life ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 303
Author(s):  
Jiri Kudrna ◽  
Frantisek Hnilicka ◽  
Jan Kubes ◽  
Pavla Vachova ◽  
Helena Hnilickova ◽  
...  
Keyword(s):  
Regression Analysis ◽  
Chlorophyll Fluorescence ◽  
Lactuca Sativa ◽  
Physiological Characteristics ◽  
Chlorophyll Fluorescence Parameters ◽  
Physiological Indicators ◽  
Fluorescence Parameters ◽  
Lactuca Sativa L ◽  
Experimental Variant ◽  
Chronic Contamination

This study analyzes the effects of acetaminophen (APAP) as a contaminant on physiological characteristics of lettuce plants (Lactuca sativa L.). Experiments were provided in an experimental greenhouse with semi-controlled conditions. The effect of different amounts of contaminant was evaluated by using regression analysis. Plants were grown in five concentrations of APAP: 0 µM, 5 µM, 50 µM, 500 µM, and 5 mM for 14 days in two variants, acute and chronic. The obtained results show that the monitored parameters were demonstrably influenced by the experimental variant. Plants are more sensitive to chronic contamination compared to acute. Significant (p < 0.05) deviation in photosynthesis and fluorescence was observed compared to the control in different variants. The highest doses of APAP reduced the intensity of photosynthesis by a maximum of more than 31% compared to the control. A reduction of 18% was observed for the fluorescence parameters. Pronounced correlation was described between chlorophyll fluorescence parameters and yield mainly under APAP conditions. The amount of chlorophyll was influenced by exposure to APAP.

Title: Enhanced salt tolerance and photosynthetic performance: Implication of ɤ-amino butyric acid application in salt-exposed lettuce (Lactuca sativa L.) plants

2018 ◽  
Vol 130 ◽  
pp. 157-172 ◽  
Author(s):  
Maryam Seifi Kalhor ◽  
Sasan Aliniaeifard ◽  
Mehdi Seif ◽  
Elahe Javadi Asayesh ◽  
Françoise Bernard ◽  
...  
Keyword(s):  
Salt Tolerance ◽  
Butyric Acid ◽  
Lactuca Sativa ◽  
Photosynthetic Performance ◽  
Amino Butyric Acid ◽  
Lactuca Sativa L

Influence of red light on the expression of genes on stomatal formation in maize seedlings

2020 ◽  
Vol 100 (3) ◽  
pp. 296-303
Author(s):  
Tie Dong Liu ◽  
Xi Wen Zhang ◽  
Yong Xu
Keyword(s):  
Blue Light ◽  
Stomatal Density ◽  
Red Light ◽  
Net Photosynthesis ◽  
Stomatal Development ◽  
Intercellular Signaling ◽  
Stomatal Index ◽  
Maize Seedlings ◽  
Expression Levels ◽  
Expression Of Genes

Red light significantly affects the expression of plant photoreceptor genes and influences stomatal development through crosstalk of the constitutive photomorphogenic 1–cryptochrome–phytochrome signaling pathway. When blue light was replaced with red light, the expression levels of ZmCry1, ZmPhyB1, ZmEPF2, and ZmEPFL9 were enhanced, whereas that of ZmCOP1 was restricted. Moreover, the expression levels of ZmSPCH and ZmMUTE were also enhanced, but they were generally lower than those under white light. Consequently, stomatal formation, which was determined by net photosynthesis, stomatal conductance, intercellular CO2 concentration, and transpiration rate, was inhibited through decreased stomatal index and stomatal density. We conclude that red light positively regulates EPFL9 in the intercellular signaling but reduces the positive regulation of blue light on COP1 and epidermal patterning factor 2 in the intracellular and intercellular signaling; therefore, though red light promotes the gene’s function on stomatal development of seedling maize, blue light maybe dominant to red light in seedling stage.

scholarly journals Green Light Improves Photosystem Stoichiometry in Cucumber Seedlings (Cucumis sativus) Compared to Monochromatic Red Light

Plants ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 824
Author(s):  
Nicholas B. Claypool ◽  
J. Heinrich Lieth
Keyword(s):  
Leaf Area ◽  
Cucumis Sativus ◽  
Blue Light ◽  
Quantum Efficiency ◽  
Photosynthetic Capacity ◽  
Red Light ◽  
Green Light ◽  
Photosynthetic Performance ◽  
Cucumber Seedlings ◽  
Light Enhancement

It has been shown that monochromatic red and blue light influence photosynthesis and morphology in cucumber. It is less clear how green light impacts photosynthetic performance or morphology, either alone or in concert with other wavelengths. In this study, cucumber (Cucumis sativus) was grown under monochromatic blue, green, and red light, dichromatic blue–green, red–blue, and red–green light, as well as light containing red, green, and blue wavelengths, with or without supplemental far-red light. Photosynthetic data collected under treatment spectra at light-limiting conditions showed that both red and green light enhance photosynthesis. However, photosynthetic data collected with a 90% red, 10% blue, 1000 µmol photons m−2 s−1, saturating light show significantly lower photosynthesis in the green, red, and red–green treatments, indicating a blue light enhancement due to photosystem stoichiometric differences. The red–green and green light treatments show improved photosynthetic capacity relative to red light, indicating partial remediation by green light. Despite a lower quantum efficiency and the lowest ambient photosynthesis levels, the monochromatic blue treatment produced among the tallest, most massive plants with the greatest leaf area and thickest stems.

scholarly journals The Impact of Light Spectrum and Intensity on the Growth, Physiology, and Antioxidant Activity of Lettuce (Lactuca sativa L.)

Plants ◽  
2021 ◽  
Vol 10 (10) ◽  
pp. 2162
Author(s):  
Shiren J. Mohamed ◽  
Hail Z. Rihan ◽  
Naofel Aljafer ◽  
Michael P. Fuller
Keyword(s):  
Antioxidant Activity ◽  
Lactuca Sativa ◽  
Red Light ◽  
High Irradiance ◽  
Light Spectrum ◽  
Led Light ◽  
Growth Physiology ◽  
Lactuca Sativa L ◽  
Light Intensities ◽  
The Impact

This study focused on the physiology, growth and antioxidant activity response of hydroponically grown lettuce (Lactuca sativa L.) under sole-source LED lighting of differing spectra. Lighting spectra were provided by differing combinations of LEDs of three different peak wavelengths, (Blue 435, Blue 450, and Red 663 nm) with ratios of B450/R663: 1.25 ± 0.1, B450/R663: 1.25 ± 0.1, and B450/R663 1:1 at two light intensities of photosynthetically active radiation (PAR) (270 μmol m−2 s−1 and 60 μmol m−2 s−1). A further experiment was conducted, in which Blue and Red LEDs were supplemented with Green (Blue 450, Red 663, and Green 520 nm) with ratios of B435/R663: 1.25 ± 0.1, B450/R663/G520: 1/0.73/0.26, and B450/R663: 1.25 ± 0.1. LED light intensities under the different spectra were adjusted to deliver the same level of PAR (270 ± 20 μmol m−2 s−1). Results from the first experiment showed that increased fraction of blue 435 nm in combination with red light at 663 nm at high irradiance enhanced the physiology of lettuce (i.e., significantly increased assimilation rate, stomatal conductance and transpiration rate) and increased the yield while having no significant effect on antioxidant activity. At the lower irradiance, the B435/R663 significantly increased antioxidant activity compared to other spectra. Results from the second experiment showed no significant effect of the spectra of LEDs on the physiology and yield of lettuce, but antioxidant activity was very significantly induced by B450/R663 at the ratio of 1.25 ± 0.1. However, the amount was still less than that obtained by B435/R663 1.25 ± 0.1 from the first experiment. This study indicates that LED light with a spectrum of B435/R663 at a ratio of 1.25 ± 0.1 significantly improves lettuce yield and antioxidant activity.

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