Effect of ultraviolet-B radiation on biochemical and antioxidant defence system in &lt;i&gt;Indigofera tinctoria&lt;/i&gt; L. seedlings

Ravindran, K. C.; Indrajith, A; Pratheesh, P.V; Sanjiviraja, K; Balakrishnan, V.

doi:10.4314/ijest.v2i5.60154

Cited by 33 publications

(19 citation statements)

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“…The UV-B-induced photomorphological changes in the leaves include leaf size reduction and foliar winding, chlorosis and tissue necrosis, increased leaf thickness, degradation of photosynthetic pigments and synthesis of phenolic compounds, which are considered UV-B filters, such as anthocyanins and flavonoids (Ravindran et al, 2010).…”

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confidence: 99%

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How does UV-B radiation affect the initial growth of common bean (Phaseolus vulgaris L.)? Physiological and structural aspects

Wanzeler

Zanetti

Fantinato

et al. 2019

BJD

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ABCTRACTIncreased UV-B radiation, a topic of concern due to climate change, can affect plant development through structural and physiological changes. Common bean (Phaseolus vulgaris L.) is a legume of great economic relevance, being one of the basic components of the human population's diet. Seeds of P. vulgaris var. Carioca were sown and grown in a growth chamber, and at 12 days of age were exposed for 15 min daily to UV-B radiation for a period of 14 days. Growth, leaf anatomy, gas exchange and pigments were evaluated. It was observed that UV-B radiation negatively affected the initial growth of bean plants, which had a reduction in height, number of leaves, fresh and dry leaf masses, leaf area, as well as reduction of stem and root dry masses. There was a reduction in the epidermis thickness, increase in the thickness of the palisade parenchyma and the leaf blade. It was verified yet reduction of the photosynthetic and photoprotectors pigments, reduction of the photosynthetic rate and alterations on the absorbent compounds of the UV-B radiation. The results obtained showed that the increase in UV-B radiation was harmful to the initial development of this crop.Palavras-chave: Agriculture, Anatomy, Beans, Pigments. RESUMOO aumento da radiação UV-B, tema preocupante em virtude das mudanças climáticas, pode afetar o desenvolvimento das plantas, por meio de mudanças estruturais e fisiológicas. O feijoeiro-comum (Phaseolus vulgaris L.) é uma leguminosa de grande relevância econômica, sendo um dos componentes básicos da alimentação humana. Sementes de P. vulgaris var. Carioca foram germinadas e cultivadas em uma câmara de crescimento, sendo aos 12 dias de idade expostas a 15 min diários de radiação UV-B, por um período de 14 dias. Foram avaliados crescimento, anatomia foliar, trocas gasosas e pigmentos. Observou-se que a radiação UV-B afetou negativamente o crescimento inicial do feijoeiro, o qual teve redução em altura, número de folhas, massa fresca, massa seca e área foliares, bem como, redução da massa seca de caule e raiz. Houve redução na espessura da epiderme e aumento nas espessuras do parênquima paliçádico e do limbo. Verificou-se, ainda, redução dos teores de pigmentos fotossintéticos e fotoprotetores, redução da taxa fotossintética e alterações nos compostos absorventes da radiação UV-B. Os resultados obtidos mostraram que o aumento da radiação UV-B foi prejudicial para o desenvolvimento inicial desta cultura.

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“…Flavonoid compounds, as secondary metabolites, play an important role in protecting plants that have been damaged by UV-B. Some plants are more tolerant to UV-B than others because they produce a variety of secondary metabolites that effectively absorb UV-B and prevent it from penetrating leaf mesophyll cells (Ravindran et al, 2010).…”

mentioning

confidence: 99%

How does UV-B radiation affect the initial growth of common bean (Phaseolus vulgaris L.)? Physiological and structural aspects

Wanzeler

Zanetti

Fantinato

et al. 2019

BJD

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“…Antioxidant enzymes play a crucial role in the dynamic balance between the production and scavenging of ROS. Earlier studies showed that SOD, CAT, POD and APX are all involved in the protection against oxidative stress (Ravindran et al 2010;Meiling et al 2012). Similarly in our study, a significant increase in the activities of antioxidant enzymes under UV-C irradiation in C. sativa may suggest the adaptive mechanism for coping UV-C stress.…”

Section: Resultsmentioning

confidence: 98%

Growth and physiochemical responses of Camelina sativa L. under UV-C stress

et al. 2016

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A study was conducted to estimate the effect of UV-C (200-280 nm) radiation stress on growth and physiochemical responses of Camelina sativa L. cv. Calina (EC643910; a potential bio-fuel crop) for its possible mass multiplication at high-altitude under high radiations. The germination percentage in terms of radicle protrusion and opening of cotyledonary leaves significantly decreased 13.98 and 27.8 %, respectively, as compared to control. However, no significant change was observed in growth parameters including root and shoot lengths and fresh biomass. The relative membrane leakage rate and lipid peroxidation as a malondialdehyde contents significantly increased with the value of *99 % and 0.17 mM g -1 FW, respectively, under UV-C stress. Also, the proline, glycine betaine and total soluble sugars contents increased by *330, *440, *144 %, respectively, as compared to control. Among non-enzymatic antioxidants, the ascorbic acid and total phenol contents significantly increased by *284 and *537 %, respectively, as compared to control. Likewise, the activity of antioxidant enzyme, ascorbate peroxidase, guaiacol peroxidase and catalase increased under UV-C stress with the value of 1.03, 0.05 and 0.06 lmol mg protein -1 min -1 , respectively. In addition, the chlorophyll a, b and total (a ? b) contents decreased by *180, *151 and *147 %, respectively, as compared to control. In contrast, the total carotenoids and anthocyanin contents increased by *160 and *184 %, respectively. Our findings suggest the adaptive growth and physiochemical responses of C. sativa under UV-C stress. Therefore, it may be recommended for large-scale cultivation at high-altitude under intense natural radiations for future bio-fuel production.

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“…Basra et al () showed that dry heat treatment of cotton seed at 80 °C for 8 h enhanced physiological and biochemical aspects of seedlings that had a photoprotective function. Another study has shown that peroxidase activity in Indigofera tinctoria increased slightly with supplemental UV‐B radiation for 2 h per day for 2 days and increased dramatically with exposure for 2 h per day for 8 days (Ravindran et al , ). Thus both the UV‐B and the high temperature achieved in the solar oven may have contributed to the biochemical changes observed in the present study.…”

Section: Discussionmentioning

confidence: 99%

Solar UV‐B radiation limits seedborne anthracnose infection and induces physiological and biochemical responses in Lupinus mutabilis

Falconí

Yánez–Mendizábal

2019

Plant Pathology

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The aim of this study was to test whether solar UV‐B radiation and temperature have an effect on infection of lupin seeds by Colletotrichum acutatum. Samples of infected seed were placed in a solar oven and exposed on sunny days for 15, 30, 45, 60, 75, 90 and 120 min. The degree of reduction in disease incidence and seed germination was dependent on the exposure time. Exposure times of 75 min (UV‐B 4.41 kJ m−2, ≈76 °C) and higher reduced incidence from 5% to undetectable levels, but also reduced seed germination by around 10% compared with untreated seed. Therefore, in a second experiment, infected seeds were exposed for 45 or 60 min in the solar oven (UV‐B 2.83 or 3.75 kJ m−2, respectively, ≈76 °C), for 60 min at ambient temperature (UV‐B 3.75 kJ m−2, ≈21 °C) or to dry heat for 60 min at 75 °C. Exposure for 60 min in the solar oven reduced seed infection by 99%, while UV‐B‐radiated seed at ambient temperature or dry‐heat reduced infection by 60% or 32%, respectively. To evaluate the effect of UV‐B plus high temperature on seedlings, lupin seed exposed for 45 or 60 min (UV‐B 2.83 or 3.75 kJ m−2, respectively, at ≈76 °C) were grown and physiological and biochemical responses of the seedlings were assessed. Seedlings from exposed seed had higher total concentrations of chlorophyll, protein and peroxidase activity than those grown from unexposed infected seed.

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Effect of ultraviolet-B radiation on biochemical and antioxidant defence system in <i>Indigofera tinctoria</i> L. seedlings

Cited by 33 publications

References 44 publications

How does UV-B radiation affect the initial growth of common bean (Phaseolus vulgaris L.)? Physiological and structural aspects

How does UV-B radiation affect the initial growth of common bean (Phaseolus vulgaris L.)? Physiological and structural aspects

Growth and physiochemical responses of Camelina sativa L. under UV-C stress

Solar UV‐B radiation limits seedborne anthracnose infection and induces physiological and biochemical responses in Lupinus mutabilis

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