Plant Responses to Metal Stress

Gangwar, Savita; Singh, Vijay Pratap; Tripathi, Durgesh Kumar; Chauhan, Devendra Kumar; Prasad, Sheo Mohan; Maurya, Jagat Narayan

doi:10.1016/b978-0-12-800875-1.00010-7

Cited by 49 publications

(8 citation statements)

References 225 publications

(222 reference statements)

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“…The accumulation of high amounts of ROS in the photosynthetic machinery particularly breaks down the D1 protein subunit of the PSII reaction center, leading to the oxidation and bleaching of chlorophyll molecules [7,51]. Exogenous kinetin applications in several concentrations have been reported to stabilize cellular membranes in several crops exposed to a heavy metal stress [52,53], waterlogged conditions [53], UV-B stress [35] and salinity stress [34], which is associated with high amounts of photosynthetic pigments resulting from kinetin-mediated enhancement in the expression of genes that encode several proteins involved in pigment biosynthesis [54]. In the current study, besides increasing carotenoid content under optimum conditions, kinetin application elicited contrasting results to the prior mentioned studies.…”

Section: Discussionmentioning

confidence: 99%

“…Kinetin application tended to increase membrane damage, as well as the disintegration of chlorophyll molecules (Figures 1 and 2, respectively). This could be related to the kinetin mechanism of action after exogenous application, through which it increases nicotinamide adenine dinucleotide activity, leading to the generation of H 2 O 2 , which acts as a signaling molecule for antioxidant defense [54]. Although the short-term increase in the content of the ROS is associated with increased cellular damage, it might substantially contribute to the overall enhancement of the antioxidant defense system, with improved tolerance to abiotic stress conditions in the long run.…”

Section: Discussionmentioning

confidence: 99%

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Exogenous Kinetin Promotes the Nonenzymatic Antioxidant System and Photosynthetic Activity of Coffee (Coffea arabica L.) Plants Under Cold Stress Conditions

Acidri

Sawai²,

Sugimoto³

et al. 2020

Plants

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Coffee plants are seasonally exposed to low chilling temperatures in many coffee-producing regions. In this study, we investigated the ameliorative effects of kinetin—a cytokinin elicitor compound on the nonenzymatic antioxidants and the photosynthetic physiology of young coffee plants subjected to cold stress conditions. Although net CO2 assimilation rates were not significantly affected amongst the treatments, the subjection of coffee plants to cold stress conditions caused low gas exchanges and photosynthetic efficiency, which was accompanied by membrane disintegration and the breakdown of chlorophyll pigments. Kinetin treatment, on the other hand, maintained a higher intercellular-to-ambient CO2 concentration ratio with concomitant improvement in stomatal conductance and mesophyll efficiency. Moreover, the leaves of kinetin-treated plants maintained slightly higher photochemical quenching (qP) and open photosystem II centers (qL), which was accompanied by higher electron transfer rates (ETRs) compared to their non-treated counterparts under cold stress conditions. The exogenous foliar application of kinetin also stimulated the metabolism of caffeine, trigonelline, 5-caffeoylquinic acid, mangiferin, anthocyanins and total phenolic content. The contents of these nonenzymatic antioxidants were highest under cold stress conditions in kinetin-treated plants than during optimal conditions. Our results further indicated that the exogenous application of kinetin increased the total radical scavenging capacity of coffee plants. Therefore, the exogenous application of kinetin has the potential to reinforce antioxidant capacity, as well as modulate the decline in photosynthetic productivity resulting in improved tolerance under cold stress conditions.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Exogenous Kinetin Promotes the Nonenzymatic Antioxidant System and Photosynthetic Activity of Coffee (Coffea arabica L.) Plants Under Cold Stress Conditions

Acidri

Sawai²,

Sugimoto³

et al. 2020

Plants

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“…Disturbances in growth and morphogenesis are visible symptoms of plant exposure to stress factors. Also, the heavy metals toxicity can be clearly traced on growth inhibition, as shown for a wide range of plant species (Wilkins, 1978;Gangwar et al, 2014;Singh et al, 2016;Hussain et al, 2017). In this experiment, we demonstrated the growth parameters of wheat plants exposed to heavy metal ions.…”

mentioning

confidence: 72%

“…This can cause alterations in the membranes permeability, inhibition of membrane enzymes, and leads to the changes in cytoplasm ion balance (Anjum et al, 2015 b). It is known that plant hormones intensively interact with ROS, thus alleviate the stress reaction of plants (Gangwar et al, 2014;Xia et al, 2015). Pretreatment of wheat seeds with Ribav-Extra contributed to a decrease in the intensity of lipid peroxidation in plant leaves ( Table 3).…”

Section: The Influence Of Heavy Metal Ions and Ribav-extra On Superoxmentioning

confidence: 99%

The effect of a growth regulator Ribav-Extra on winter wheat seedlings exposed to heavy metals

Gruznova

Bashmakov

Miliauskienė

et al. 2018

Zemdirbyste-Agriculture

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We studied the influence of a natural plant growth regulator Ribav-Extra and ions of heavy metals (HM) Pb 2+ , Cu 2+ , Zn 2+ and Ni 2+ on the physiological and biochemical indices of the winter wheat (Triticum aestivum L. ) cultivar 'Mironovskaya 808'. The seeds of wheat were treated with Ribav-Extra (10 ppm) and grown for 7 days on heavy metal salt solutions (10 μM or 1 mM). After that we recorded heavy metals accumulation, growth, generation of superoxide anion ( • O 2 − ), lipid peroxidation (LPO), and catalase (CAT) and ascorbate peroxidase (APOX) activity. It was found that 1 mM of HM in growth media increased heavy metals accumulation in wheat plants and inhibited the growth of roots and shoots. Both low and high concentrations of heavy metals stimulated • O 2 − production and oxidative damage in wheat seedlings. In most treatments, the toxic effect of heavy metals enhanced at higher concentration of metals. Pre-sowing treatment of seeds with Ribav-Extra decreased the negative impact of heavy metals by reducing oxidative stress which led to suppressed • O 2 − generation, lipid peroxidation intensity and catalase activity. This suggests that the wheat plants, whose seeds had been treated with Ribav-Extra, were more heavy metal-resistant than the untreated ones.Please use the following format when citing the article: Gruznova K. A., Bashmakov D. I., Miliauskienė J., Vaštakaitė V., Duchovskis P., Lukatkin A. S. 2018. The effect of a growth regulator Ribav-Extra on winter wheat seedlings exposed to heavy metals. Zemdirbyste-Agriculture, 105 (3): 227-234

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“…S1D Fig . Ascorbate peroxidase (APX) enzyme is crucial for the protection from damage by H 2 O 2 and hydroxyl radicals (•OH) [ 56 ]. Antioxidant enzymes activities namely, CAT, POD, and SOD were not tested earlier in selected wild medicinal taxa while few records reported earlier in other wild taxa like Rumex obtusifolius a wild medicinal plant and found to have a good antioxidant capacity [ 57 ].…”

Section: Resultsmentioning

confidence: 99%

Biochemical profile and bioactive potential of thirteen wild folk medicinal plants from Balochistan, Pakistan

2020

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The recent focus is on the analysis of biological activities of extracts from thirteen folk medicinal plants from arid and semi-arid zones of Balochistan, Pakistan. Only a small proportion of them have been scientifically analyzed. Therefore the present investigation explores the biochemical and bioactive potential of different plant parts. Superoxide dismutase was detected maximum in Fagonia indica, (184.7±5.17 units/g), ascorbate peroxidase in Tribulus pentandrus (947.5±12.5 units/g), catalase and peroxidase were higher in Peganum harmala (555.0±5.0 and 2597.8±0.4 units/g, respectively). Maximum esterase and α-amylase activity was found in Zygophyllum fabago (14.3±0.44 and 140±18.8 mg/g, respectively). Flavonoid content was high in T. pentandrus (666.1±49 μg/ml). The highest total phenolic content and tannin was revealed in F. olivieri (72125±425 and 37050±1900 μM/g, respectively). The highest value of ascorbic acid was depicted in F. bruguieri (F.b.N) (448±1.5 μg/g). Total soluble proteins and reducing sugars were detected higher in P. harmala (372.3±54 and 5.9 ±0.1 mg/g, respectively). The maximum total antioxidant capacity was depicted in Tetraena simplex (16.9±0.01 μM/g). The highest value of lycopene and total carotenoids exhibited in T. terrestris (7.44±0.2 and 35.5±0.0 mg/g, respectively). Chlorophyll contents were found maximum in T. pentandrus var. pterophorus (549.1±9.9, 154.3±10, and 703.4±20.2 ug/g, respectively). All taxa exhibited anti-inflammatory activity and anti-diabetic potential. Z. eurypterum seeds exhibited the highest anti-inflammatory potential (96%), along with other taxa indicated (96-76%) activity when compared with the standard drug diclofenac sodium (79%). Seeds of T. pentandrus (85%) exhibited the highest anti-diabetic activity. The other taxa also exhibited inhibitory activity of α-amylase ranging from (85-69%) compared with Metformin (67%) standard drug. Phytochemical screening revealed that selected taxa proved to be the potential source of natural antioxidants and could further be explored for invivo studies and utilized in pharmaceutical industries as potent therapeutic agents validating their ethno-pharmacological uses.

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Plant Responses to Metal Stress

Cited by 49 publications

References 225 publications

Exogenous Kinetin Promotes the Nonenzymatic Antioxidant System and Photosynthetic Activity of Coffee (Coffea arabica L.) Plants Under Cold Stress Conditions

Exogenous Kinetin Promotes the Nonenzymatic Antioxidant System and Photosynthetic Activity of Coffee (Coffea arabica L.) Plants Under Cold Stress Conditions

The effect of a growth regulator Ribav-Extra on winter wheat seedlings exposed to heavy metals

Biochemical profile and bioactive potential of thirteen wild folk medicinal plants from Balochistan, Pakistan

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