Effects of supplemental ultraviolet-B and cadmium on growth, antioxidants and yield of Pisum sativum L.

Agrawal, Shashi Bhushan; Mishra, Shweta

doi:10.1016/j.ecoenv.2007.10.007

Cited by 85 publications

(58 citation statements)

References 39 publications

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“…higher (approximately 5-fold) activation of peroxidases than of total SOD (1.5-fold) and no change in catalase [40]. Different conditions, similar PAR but an approximately four-times higher UV-B (Table A.1) resulted in oxidative stress in pea and wheat leaves, with marked increase not only in H 2 O 2 but also in lipid peroxidation products [42]. UV-B enhanced SOD activity in this study but peroxidase enzymes were unaffected [40].…”

Section: Uv and Antioxidantsmentioning

confidence: 93%

“…For example, grapevine leaves exposed to extra UV-B had higher SOD activity than sunlight acclimated ones, but ascorbate peroxidase or peroxidase activities were basically unaffected [41]. Conversely, applying supplemental UV-B to pea (Pisum sativum L.) leaves grown out of doors in the tropics resulted in a larger increase in peroxidase activities than SOD, and a decrease in catalase activity [42]. In addition to examining different species, the two experiments were different in several other conditions and are only mentioned here to illustrate the diversity of outdoor responses.…”

Section: Uv and Antioxidantsmentioning

confidence: 99%

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UV-B effects on leaves—Oxidative stress and acclimation in controlled environments

2016

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As the steady decline in the Earth's stratospheric ozone layer and parallel increase in solar ultraviolet-B (UV-B: 280-315 nm) has come to an end, the focus of plant UV research has been shifted from regarding UV-B as threatening plant life to recognizing it as a regulatory factor. While UV-B photoreceptor mediated signaling is increasingly understood, the role of UV-B inducible reactive oxygen species is still to be explored. Earlier experiments with high UV-B irradiation doses and isolated thylakoid membranes demonstrated the potential of UV-B to trigger oxidative stress.However, under realistic UV conditions pro-oxidants cannot be reliably traced in more complex biological samples possessing an array of antioxidant defenses. In the absence of direct experimental evidence we must rely on indications and propose hypotheses on how and whether pro-oxidants, such as reactive oxygen species contribute to acclimative responses. Here we briefly review how a balance between pro-oxidants and antioxidants is affected by UV-B in whole plant experiments performed in controlled environments. A working hypothesis is proposed in which the extents of UVinduced peroxidase and superoxide dismutase activations affect the success of acclimation to UV-B.

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Section: Uv and Antioxidantsmentioning

confidence: 93%

Section: Uv and Antioxidantsmentioning

confidence: 99%

UV-B effects on leaves—Oxidative stress and acclimation in controlled environments

2016

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“…An unusual result was observed: exposure to the low radiation dose caused a significant increase in TBA reactive compounds affecting membrane structure and function, while no alterations were observed following exposure to the highest radiation dose (figure 1). For P. sativum plants exposed to UV-B radiation, Agrawal and Mishra [25] also reported a significant increase in the level of lipid peroxidation. Transcript levels are expressed relatively to the control for leaves and roots separately and data points represent the mean ± S.E.…”

Section: S404 Radioprotectionmentioning

confidence: 91%

Study of biological effects and oxidative stress related responses in gamma irradiatedArabidopsis thalianaplants

et al. 2011

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Abstract. This study aimed at investigating biological effects in Arabidopsis thaliana leaves and roots irradiated for 72 h with 3.5 Gy or 30 Gy of gamma radiation, and to unravel oxidative stress related responses to achieve a better understanding of the importance of the cellular redox balance as a modulator in gamma radiation stress. A. thaliana performs like a rather radioresistant plant species as no alterations on growth and only minor alterations in the nutrient profile were observed. Gamma irradiation did not seem to induce an NADPH mediated oxidative burst and lipid peroxidation appeared to be directly induced by ionizing radiation rather than mediated through LOX activity. As ionizing radiation can cause indirect damage via water radiolysis, H 2 O 2 is hypothesized to be an important reactive oxygen species under radiation stress. Although most H 2 O 2 -scavenging enzymes remained unchanged, important alterations were observed for CAT1, CAT2 and CAT3 expression.

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“…While the accumulation of flavonoids and hydroxycinnamic acids in epidermal cells is the main mechanism of plants to build up protection against UV [16,17], this may lead to pigment induction and DNA repair [18,19]. For example, flavonoids, apart from having antioxidant properties, protect plants from UV-B radiation by working as an internal filter [20]. Interestingly however, the effects of UV-B radiation on photosynthesis vary among species and can have negative effects on leaf photosynthesis in some plants [21,22] and little or no effect in others [23].…”

Section: Introductionmentioning

confidence: 99%

Effects of substrate acidity and UV-B radiation on photosynthesis of radishes

Januškaitienė

2011

Open Life Sciences

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The aim of this study was to assess the combined effect of substrate acidity (pH 4.8; pH 3.8) and 1 kJm−2d−1 UV-B radiation on photosynthesis and growth of radishes (Raphanus sativus L.). Radishes were sown in a neutral pH 6.5 peat substrate. When the second true leaf unfolded, the growth substrate was acidified using different concentration of H2SO4 and exposed to UV-B radiation for a period of ten days. Gas exchange parameters were measured with the LI-6400 portable photosynthesis system. Content of chlorophyll was evaluated spectrophotometrically. The results showed that the greatest inhibition of net photosynthesis was observed when radishes were grown in an acidified pH 3.8 substrate. The decrease of the photosynthesis of radish plants treated with both investigated factors (substrate acidity and UV-B) were lower compared to the effect of substrate acidity alone. UV-B radiation stimulated both enzymatic reactions of photosynthesis and water use efficiency of radish plants grown in acidified peat substrates. Also, investigated factors had higher impact on biomass of tuber than biomass of foliage.

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Effects of supplemental ultraviolet-B and cadmium on growth, antioxidants and yield of Pisum sativum L.

Cited by 85 publications

References 39 publications

UV-B effects on leaves—Oxidative stress and acclimation in controlled environments

UV-B effects on leaves—Oxidative stress and acclimation in controlled environments

Study of biological effects and oxidative stress related responses in gamma irradiatedArabidopsis thalianaplants

Effects of substrate acidity and UV-B radiation on photosynthesis of radishes

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