Comparison of Chlorophyll Fluorescence Parameters of Cucumis Sativus and Mentha Piperita Leaves Exposed to Short-Term UV-B Irradiation

Skórska, Elżbieta

doi:10.2478/v10182-011-0002-7

Cited by 10 publications

(9 citation statements)

References 19 publications

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“…The deleterious effects of UV radiation on growth, productivity and photosynthesis in higher plants have been studied extensively (Rybus-Zając and Kubiś, 2010;Skórska, 2011). UVB radiation impairs all major processes of photosynthesis, including photochemical reactions in thylakoid membranes (Skórska 2011), and causes oxidative damage and growth inhibition in higher plants (Rybus-Zając and Kubiś, 2010).…”

Section: Introductionmentioning

confidence: 99%

Comparison of Water Stress and uv Radiation Effects on Induction of Cam and Antioxidative Defense in the Succulent Rosularia Elymaitica (Crassulaceae)

Habibi¹,

Hajiboland²

2011

Acta Biologica Cracoviensia Series Botanica

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Growth and photosynthetic characteristics, inducibility of the CAM pathway and the functioning of the antioxidant defense system were investigated in Rosularia elymaitica (Crassulaceae) under drought and UV stresses. Drought did not substantially affect the growth of the plants, but it significantly reduced leaf thickness as well as osmotic potential, water potential and relative water content. In contrast, UV radiation treatment affected neither growth nor the water relations of leaves. Water limitation for 12 days caused a significant increase in nighttime PEPC and NAD-MDH activity and an increase in Δtitratable acidity relative to well-watered plants. The nighttime CO 2 net assimilation rate increased significantly in drought-stressed plants but was still negative, resembling a C 3 -like pattern of gas exchange. Twenty days of UV treatment, increased Δtitratable acidity slightly and increased only daytime PEPC activity, and did not affect other parameters of carbon metabolism. As judged by maintenance of membrane integrity and stable amounts of H 2 O 2 under UV stress, the antioxidant defense system effectively protected the plants against UV radiation. In contrast, oxidative stress occurred under severe drought stress (20 days of withholding water). Except for higher daytime APX activity in the UV-treated plants, enzyme activity in the control and in the drought-and UV-stressed plants did not show any diurnal fluctuation during 24 h. Temporal changes in Δtitratable acidity and ΔPEPC activity coincided closely with those of antioxidant enzymes; both started to increase after 12 days of drought stress. These results indicate that drought stress but not UV radiation induced the CAM-cycling pathway in R. elymaitica.

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Section: Introductionmentioning

confidence: 99%

Comparison of Water Stress and uv Radiation Effects on Induction of Cam and Antioxidative Defense in the Succulent Rosularia Elymaitica (Crassulaceae)

Habibi¹,

Hajiboland²

2011

Acta Biologica Cracoviensia Series Botanica

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“…The cause of the reduction might be associated with enhancement of excitation energy quenching in PSII antennae. The decline in Y is generally considered to indicate physiological regulation of electron transport (Skórska 2011). Day and Vogelmann (1995) also suggested the Y is lower in UV-B Table 2.…”

Section: Discussionmentioning

confidence: 99%

“…Shoot biomass [g m (Skórska 2011). RLCs can provide information on the saturation characteristics of electron transport, as well as the overall photosynthetic performance of a plant (Cruz and Serôdio 2008).…”

Section: Stagementioning

confidence: 99%

Chlorophyll content and photosystem II efficiency in soybean exposed to supplemental ultraviolet-B radiation

Chen

et al. 2013

Photosynt.

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Chlorophyll (Chl) a fluorescence parameters and rapid light curves of soybean [Glycine max (L.) Merrill] were measured by pulse amplitude modulation fluorometry. Measurements were taken during different stages of soybean growth under field conditions with 20% enhancement in ultraviolet-B (UV-B) radiation. Results showed that supplemental UV-B radiation decreased Chl contents by 5.5% (P=0.048), 8.7% (P=0.046), and 10.5% (P=0.005) in seedling, in branching-flowering, and in pod-setting stages, respectively. In the branching-flowering and pod-setting stages, maximum quantum yield of photosystem (PS) II photochemistry (F v /F m ) decreased by 6.1% (P=0.001) and 3.0% (P=0.009), respectively. Supplemental UV-B radiation significantly decreased the effective quantum yield (Y). The photosynthetic capacity at light saturation (P m ) also decreased in both the seedling and branching-flowering stages by 28.9% (P=0.007) and 15.5% (P=0.041), respectively. However, Y and P m showed no significant difference in the trefoil and pod-setting stages with and without the UV treatment. The light saturation parameter (E k ) decreased by 21.1% (P=0.000) and 23.2% (P=0.029) in the trefoil and seedling stages, respectively. Moreover, the initial slope (α) decreased by 21.1% (P=0.001) in the branching-flowering stage. Nonphotochemical quenching (NPQ) in the seedling stage and photochemical quenching coefficient (q p ) in the branching-flowering stage decreased significantly under UV-B treatments. The results of the present study suggest that supplemental UV-B radiation adversely affected Chl content and electron transport activity in PSII and consequently decreased the photosynthetic efficiency of soybean plants.

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“…The net photosynthesis intensity (p N , μmol CO 2 m -2 s -1 ) and transpiration rate (E, mmol H 2 O m -2 s -1 ) were measured using an open circuit portable TPS-2 gas-exchange system with a portable PLC camera (PP Systems, UK). Chlorophyll fluorescence parameters (F v /F o , ETR, Rfd) of maize leaves were measured with a PAM 210 fluorometer (Walz, Effeltrich, Germany), as described earlier (Skórska and Murkowski, 2018). To determine UV-absorbing compounds (mainly flavonoids) the ethanol extract from leaves was prepared according to Caldwell et al (1994).…”

Section: Methodsmentioning

confidence: 99%

Acta Biologica Cracoviensia s. Botanica

Skórska¹,

Grzeszczuk²,

Barańska³

et al. 2018

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The experiment on Zea mays L. cv. Landmark (F1) plants was performed in a greenhouse with UV-B (305-315 nm). The pots with plants were divided into four groups: the first and the second groups were grown, respectively, at low (1.0 kJ m -2 d -1 ) and high (3.0 kJ m -2 d -1 ) biological effective dose of UV-B radiation. Half of the pots of each group were sprayed with 0.1% solution of Asahi SL (the third and fourth groups). The intensity of photosynthesis and transpiration, chlorophyll fluorescence, the content of UV-absorbing compounds and radical scavenging activity were measured using DPPH after four and six weeks of UV-B radiation. After six weeks of irradiation with a higher UV-B dose both flavonoid content and antioxidant activity increased by 112% and by 44%, respectively, compared to the plants grown at the lower dose. The plants treated with Asahi SL and exposed to the high dose of UV-B had the content of flavonoids 80% higher than the control ones. Asahi SL decreased scavenging activity in both groups of plants by 17% and 32%, respectively, in comparison with the untreated plants. The intensity of net photosynthesis, the transpiration rate and chlorophyll fluorescence parameters (Fv/Fo, ETR, Rfd) did not differ in most of variants.

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Comparison of Chlorophyll Fluorescence Parameters of Cucumis Sativus and Mentha Piperita Leaves Exposed to Short-Term UV-B Irradiation

Cited by 10 publications

References 19 publications

Comparison of Water Stress and uv Radiation Effects on Induction of Cam and Antioxidative Defense in the Succulent Rosularia Elymaitica (Crassulaceae)

Comparison of Water Stress and uv Radiation Effects on Induction of Cam and Antioxidative Defense in the Succulent Rosularia Elymaitica (Crassulaceae)

Chlorophyll content and photosystem II efficiency in soybean exposed to supplemental ultraviolet-B radiation

Acta Biologica Cracoviensia s. Botanica

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