Effect of Light Intensity on Photosynthesis

Wimalasekera, Rinukshi

doi:10.1002/9781119501800.ch4

Cited by 40 publications

(31 citation statements)

References 33 publications

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“…Besides the waterlogging stress, for efficient gas exchanges between cucumber leaves and the environment, the optimum PPFD for both cultivars, irrespective of the origin, was 1,500 µmol m −2 s −1 under the control conditions. However, above the optimum PPFD as depicted in Figure 8, revealed A photoinhibition, signifying that an increased PPFD may further hamper cucumber plants' growth and developmental processes under waterlogging conditions (Wimalasekera, 2019). Alterations in chlorophyll fluorescence parameters of waterlogged cucumber plants are an adaptive response to waterlogging stress, notwithstanding the photosynthetic apparatus damage.…”

Section: Discussionmentioning

confidence: 94%

Short waterlogging events differently affect morphology and photosynthesis of two cucumber (Cucumis sativus L.) cultivars

et al. 2022

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Waterlogging induces growth and developmental changes in sensitive crops such as cucumber (Cucumis sativus L.) during early plant development. However, information on the physiological mechanisms underpinning the response of cucumber plants to waterlogging conditions is limited. Here, we investigated the effects of 10-day waterlogging stress on the morphology, photosynthesis, and chlorophyll fluorescence parameters in two cultivars of cucumber seedlings. Waterlogging stress hampered cultivars’ growth, biomass accumulation, and photosynthetic capacity. Both cultivars also developed adventitious roots (ARs) after 10 days of waterlogging (DOW). We observed differential responses in the light- and carbon-dependent reactions of photosynthesis, with an increase in light-dependent reactions. At the same time, carbon assimilation was considerably inhibited by waterlogging. Specifically, the CO2 assimilation rate (A) in leaves was significantly reduced and was caused by a corresponding decrease in stomatal conductance (gs). The downregulation of the maximum rate of Rubisco efficiency (Vcmax) and the maximum rate of photosynthetic electron transport (Jmax) were non-stomatal limiting factors contributing to A reduction. Exposure of cucumber to 10 DOW affected the PSII photochemistry by downregulating the PSII quantum yield (ΦPSII). The redox state of the primary quinone acceptor in the lake model (1-qL), a measure of the regulatory balance of the light reactions, became more oxidized after 10 DOW, indicating enhanced electron sink capacity despite a reduced A. Overall, the results suggest that waterlogging induces alterations in the photochemical apparatus efficiency of cucumber. Thus, developing cultivars that resist inhibition of PSII photochemistry while maintaining carbon metabolism is a potential approach for increasing crops’ tolerance to waterlogged environments.

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Section: Discussionmentioning

confidence: 94%

Short waterlogging events differently affect morphology and photosynthesis of two cucumber (Cucumis sativus L.) cultivars

et al. 2022

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“…At lower light intensity while staying beyond the light compensation point (LCP), the photosynthetic rate increases at a rate that is proportional to the light intensity and eventually plateaus off . Beyond that, higher light intensity has no benefits and instead may impact the physiology of the plant negatively.…”

Section: Lightmentioning

confidence: 99%

Shaping and Tuning Lighting Conditions in Controlled Environment Agriculture: A Review

Neo

Ong

Lee

et al. 2022

ACS Agric. Sci. Technol.

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Light is one of the most important ingredients for healthy plant growth. It is also responsible for triggering a number of plant physiological responses. For centuries, humans have relied on sunlight and good climate for ideal crop growth. As such, extensive research has been carried out to study how to mimic sunlight or even better. Armed with modern technology, farmers can now gain greater control over light management in controlled environment agriculture (CEA). Growing plants in CEA requires delivering the required photons to the plant via artificial means: by redirecting sunlight indoors, by employing artificial lights, or by using a hybrid lighting system. Using artificial lights, the required energy for photosynthesis can be provided regardless of sunlight availability. This Review describes and assesses various artificial grow light technologies, solar spectral shaping and redirection, and hybrid lighting technologies to generate high and consistent crop yield in CEA. In addition, this Review also captures the recent advances in the use of color conversion films in manipulating light spectrum to cater to the growth of plants.

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“…This decrease might be caused by excessive exposure to light or nutritional depletion during the growth process (Bonnanfant et al, 2019). A higher Fv/Fm ratio implies the efficiency of water splitting and carbon fixation at PSII, allowing for higher photosynthetic electron transport (Wimalasekera, 2019).…”

Section: Photosynthetic Transientsmentioning

confidence: 99%

“…Y(NO) (inversely proportional to YPSII) decreased from 0.563 (day 0) to 0.445 (day 8) (Figure 3C). As the cell growth increases, Y(NO) remains steady and defective in inducing thermal dissipation (Wimalasekera, 2019). The change in Fm and Fm' indicates photochemical quenching (NPQ).…”

Section: Photosynthetic Transientsmentioning

confidence: 99%

Comparative appraisal of nutrient recovery, bio-crude, and bio-hydrogen production using Coelestrella sp. in a closed-loop biorefinery

Kopperi

Mohan

2022

Front. Bioeng. Biotechnol.

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A closed loop algal-biorefinery was designed based on a three-stage integration of dairy wastewater (DWW) treatment, hydrothermal liquefaction (HTL) of defatted algal biomass, and acidogenic process in a semi-synthetic framework. Initially, Coelestrella sp SVMIICT5 was grown in a 5 L photo-bioreactor and scaled up to a 50 L flat-panel photo-bioreactor using DWW. The microalgal growth showed higher photosynthetic efficiency, resulting in a biomass growth of 3.2 g/L of DCW with 87% treatment efficiency. The biomolecular composition showed 26% lipids with a good fatty acid profile (C12-C21) as well as carbohydrate (24.9%) and protein (31.8%) content. In the second stage, the de-oiled algal biomass was valorized via HTL at various temperatures (150°C, 200°, and 250°C) and reaction atmospheres (N2 and H2). Among these, the 250°C (H2) condition showed a 52% bio-crude fraction and an HHV of ∼29.47 MJ/kg (bio-oil) with a saturated hydrocarbon content of 64.3% that could be further upgraded to jet fuels. The energy recovery (73.01%) and elemental enrichment (carbon; 65.67%) were relatively greater in H2 compared to N2 conditions. Finally, dark fermentation of the complex-structured HTL-AF stream resulted in a total bio-H2 production of 231 ml/g of TOC with a 63% treatment efficiency. Life cycle analysis (LCA) was also performed for the mid-point and damage categories to assess the sustainability of the integrated process. Thus, the results of this study demonstrated comprehensive wastewater treatment and valorization of de-oiled algal biomass for chemical/fuel intermediates in the biorefinery context by low-carbon processes.

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Effect of Light Intensity on Photosynthesis

Cited by 40 publications

References 33 publications

Short waterlogging events differently affect morphology and photosynthesis of two cucumber (Cucumis sativus L.) cultivars

Short waterlogging events differently affect morphology and photosynthesis of two cucumber (Cucumis sativus L.) cultivars

Shaping and Tuning Lighting Conditions in Controlled Environment Agriculture: A Review

Comparative appraisal of nutrient recovery, bio-crude, and bio-hydrogen production using Coelestrella sp. in a closed-loop biorefinery

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