Antioxidative response and photosynthetic regulatory mechanisms in common fig leaves after short‐term chilling stress

Mlinarić, Selma; Cesar, Vera; Lepeduš, Hrvoje

doi:10.1111/aab.12671

Cited by 7 publications

(6 citation statements)

References 75 publications

(115 reference statements)

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“…Moreover, Venkatesh et al (2012) and Kalaji et al (2016) reported that a negative K-band indicates an intactness of the oxygen-evolving complex (OEC) and thus, functional PSII antenna size. Also in our study OEC probably contributed more to the donation of electrons towards PSII than in control plants (Figure 3D) what is considered to be a competent mechanism to improve tolerance under short-term chilling (Mlinarićet al, 2021).…”

Section: A B Figuresupporting

confidence: 48%

Effects of chilling on the photosynthetic performance of the CAM orchid Phalaenopsis

et al. 2022

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IntroductionCrassulacean acid metabolism (CAM) is one of the three main metabolic adaptations for CO2 fixation found in plants. A striking feature for these plants is nocturnal carbon fixation and diurnal decarboxylation of malic acid to feed Rubisco with CO2 behind closed stomata, thereby saving considerable amounts of water. Compared to the effects of high temperatures, drought, and light, much less information is available about the effects of chilling temperatures on CAM plants. In addition a lot of CAM ornamentals are grown in heated greenhouses, urging for a deeper understanding about the physiological responses to chilling in order to increase sustainability in the horticultural sector.MethodsThe present study focuses on the impact of chilling temperatures (10°C) for 3 weeks on the photosynthetic performance of the obligate CAM orchid Phalaenopsis ‘Edessa’. Detailed assessments of the light reactions were performed by analyzing chlorophyll a fluorescence induction (OJIP) parameters and the carbon fixation reactions by measuring diel leaf gas exchange and diel metabolite patterns.Results and DiscussionResults showed that chilling already affected the light reactions after 24h. Whilst the potential efficiency of photosystem II (PSII) (Fv/Fm) was not yet influenced, a massive decrease in the performance index (PIabs) was noticed. This decrease did not depict an overall downregulation of PSII related energy fluxes since energy absorption and dissipation remained uninfluenced whilst the trapped energy and reduction flux were upregulated. This might point to the presence of short-term adaptation mechanisms to chilling stress. However, in the longer term the electron transport chain from PSII to PSI was affected, impacting both ATP and NADPH provision. To avoid over-excitation and photodamage plants showed a massive increase in thermal dissipation. These considerations are also in line with carbon fixation data showing initial signs of cold adaptation by achieving comparable Rubisco activity compared to unstressed plants but increasing daytime stomatal opening in order to capture a higher proportion of CO2 during daytime. However, in accordance with the light reactions data, Rubisco activity declined and stomatal conductance and CO2 uptake diminished to near zero levels after 3 weeks, indicating that plants were not successful in cold acclimation on the longer term.

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Section: A B Figuresupporting

confidence: 48%

Effects of chilling on the photosynthetic performance of the CAM orchid Phalaenopsis

et al. 2022

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“…The ΔV OP ( Figure 1 A,F) revealed additional differences in range from 0.02 to 30 ms, which corresponds to L-, K-, and H-bands with amplitudes more pronounced in the USO31 cultivar. Positive amplitudes are usually associated with the nutrient deficiency [ 28 , 29 ], heavy metal stress [ 30 ], salt stress [ 31 , 32 ], drought [ 33 ], and low temperature [ 34 ]. Growing plants at W24/0 caused the appearance of positive amplitudes in both cultivars, with the exception of a negative peak around 30–300 ms, which corresponds with the G-band.…”

Section: Resultsmentioning

confidence: 99%

Effect of Prolonged Photoperiod on Light-Dependent Photosynthetic Reactions in Cannabis

Gajdošik

Vicić

Gvozdić

et al. 2022

IJMS

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Industrial hemp is a fast-growing, short-day plant, characterized by high biomass yields and low demands for cultivation. To manipulate growth, hemp is usually cultivated under prolonged photoperiods or continuous light that could cause photooxidative damage and adjustments of photosynthetic reactions. To determine the extent of changes in photosynthetic response caused by prolonged light exposure, we employed chlorophyll a fluorescence measurements accompanied with level of lipid peroxidation (TBARS) and FT-IR spectroscopy on two Cannabis cultivars. Plants were grown under white (W) and purple (P) light at different photoperiods (16/8, 20/4, and 24/0). Our results showed diverse photosynthetic reactions induced by the different light type and by the duration of light exposure in two cultivars. The most beneficial condition was the 16/8 photoperiod, regardless of the light type since it brought the most efficient physiological response and the lowest TBARS contents suggesting the lowest level of thylakoid membrane damage. These findings indicate that different efficient adaptation strategies were employed based on the type of light and the duration of photoperiod. White light, at both photoperiods, caused higher dissipation of excess light causing reduced pressure on PSI. Efficient dissipation of excess energy and formation of cyclic electron transport around PSI suggests that P20/4 initiated an efficient repair system. The P24/0 maintained functional electron transport between two photosystems suggesting a positive effect on the photosynthetic reaction despite the damage to thylakoid membranes.

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“…Our results were consistent with previous reports by Hou et al (2016) , who also found lower chlorophyll content in watermelon seedlings grown at cold temperatures. This is because plants exposed to low temperatures experience chilling injury, which enhances ion imbalance, reduction in antioxidant activity, and low chlorophyll content ( Lu et al, 2020 ; Mlinarić et al, 2021 ). Chlorophyll content in drought-stressed seedlings was least affected among the three treatment types, although significant changes were observed between control and drought-stressed seedlings during the respective treatment schedule.…”

Section: Discussionmentioning

confidence: 99%

Monitoring of Salinity, Temperature, and Drought Stress in Grafted Watermelon Seedlings Using Chlorophyll Fluorescence

2021

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Chlorophyll fluorescence (CF) is used to measure the physiological status of plants affected by biotic and abiotic stresses. Therefore, we aimed to identify the changes in CF parameters in grafted watermelon seedlings exposed to salt, drought, and high and low temperatures. Grafted watermelon seedlings at the true three-leaf stage were subjected to salinity levels (0, 50, 100, 150, and 200 mM) and temperature [low (8°C), moderate (24°C), and high (40°C)] stresses for 12 days under controlled environmental conditions independently. Eight CF parameters were measured at 2-day intervals using the FluorCam machine quenching protocol of the FluorCam machine. The seedlings were also exposed to drought stress for 3 days independent of salinity and temperature stress; CF parameters were measured at 1-day intervals. In addition, growth parameters, proline, and chlorophyll content were evaluated in all three experiments. The CF parameters were differentially influenced depending on the type and extent of the stress conditions. The results showed a notable effect of salinity levels on CF parameters, predominantly in maximum quantum yield (Fv/Fm), non-photochemical quenching (NPQ), the ratio of the fluorescence decrease (Rfd), and quantum yield of non-regulated energy dissipation in PSII [Y(NO)]. High temperature had significant effects on Rfd and NPQ, whereas low temperature showed significant results in most CF parameters: Fv/Fm, Y(NO), NPQ, Rfd, the efficiency of excitation capture of open photosystem II (PSII) center (Fv′/Fm′), and effective quantum yield of photochemical energy conversion in PSII [Y(PSII)]. Only NPQ and Rfd were significantly influenced by severe drought stress. Approximately, all the growth parameters were significantly influenced by the stress level. Proline content increased with an increase in stress levels in all three experiments, whereas the chlorophyll (a and b) content either decreased or increased depending upon the stressor. The results provided here may be useful for understanding the effect of abiotic stresses on CF parameters and the selection of index CF parameters to detect abiotic stresses in grafted watermelon seedlings.

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Antioxidative response and photosynthetic regulatory mechanisms in common fig leaves after short‐term chilling stress

Cited by 7 publications

References 75 publications

Effects of chilling on the photosynthetic performance of the CAM orchid Phalaenopsis

Effects of chilling on the photosynthetic performance of the CAM orchid Phalaenopsis

Effect of Prolonged Photoperiod on Light-Dependent Photosynthetic Reactions in Cannabis

Monitoring of Salinity, Temperature, and Drought Stress in Grafted Watermelon Seedlings Using Chlorophyll Fluorescence

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