Alleviation of cadmium toxicity by cerium in rice seedlings is related to improved photosynthesis, elevated antioxidant enzymes and decreased oxidative stress

Wu, Min; Wang, Pingyang; Sun, Lingang; Zhang, Jingjing; Yu, Jing; Wang, Yuwen; Chen, Guoxiang

doi:10.1007/s10725-014-9916-x

Cited by 67 publications

(43 citation statements)

References 37 publications

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“…Generally, plants subjected to heavy metal stress typically have lower Fv/Fm values than non-stressed plants, which is associated with photoinhibition of PSII (Krause and Weis, 1991; Wu et al, 2014). In the present study, the Fv/Fm ratio was significantly reduced in the plants treated with 1400 mg kg -1 Pb 2+ ( Figure 4A ).…”

Section: Discussionmentioning

confidence: 99%

Magnesium Alleviates Adverse Effects of Lead on Growth, Photosynthesis, and Ultrastructural Alterations of Torreya grandis Seedlings

et al. 2016

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Magnesium (Mg2+) has been shown to reduce the physiological and biochemical stress in plants caused by heavy metals. To date our understanding of how Mg2+ ameliorates the adverse effects of heavy metals in plants is scarce. The potential effect of Mg2+ on lead (Pb2+) toxicity in plants has not yet been studied. This study was designed to clarify the mechanism of Mg2+-induced alleviation of lead (Pb2+) toxicity. Torreya grandis (T. grandis) seedlings were grown in substrate contaminated with 0, 700 and 1400 mg Pb2+ per kg-1 and with or without the addition of 1040 mg kg-1 Mg2+. Growth parameters, concentrations of Pb2+ and Mg2+ in the plants’ shoots and roots, photosynthetic pigment, gas exchange parameters, the maximum quantum efficiency (Fv/Fm), root oxidative activity, ultrastructure of chloroplasts and root growth were determined to analyze the effect of different Pb2+ concentrations on the seedlings as well as the potential ameliorating effect of Mg2+ on the Pb2+ induced toxicity. All measurements were tested by a one-way ANOVA for the effects of treatments. The growth of T. grandis seedlings cultivated in soils treated with 1400 mg kg-1 Pb2+ was significantly reduced compared with that of plants cultivated in soils treated with 0 or 700 mg kg-1 Pb2+. The addition of 1040 mg kg-1 Mg2+ improved the growth of the Pb2+-stressed seedlings, which was accompanied by increased chlorophyll content, the net photosynthetic rate and Fv/Fm, and enhanced chloroplasts development. In addition, the application of Mg2+ induced plants to accumulate five times higher concentrations of Pb2+ in the roots and to absorb and translocate four times higher concentrations of Mg2+ to the shoots than those without Mg2+ application. Furthermore, Mg2+ addition increased root growth and oxidative activity, and protected the root ultrastructure. To the best of our knowledge, our study is the first report on the mechanism of Mg2+-induced alleviation of Pb2+ toxicity. The generated results may have important implications for understanding the physiological interactions between heavy metals and plants, and for successful management of T. grandis plantations grown on soils contaminated with Pb2+.

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Section: Discussionmentioning

confidence: 99%

Magnesium Alleviates Adverse Effects of Lead on Growth, Photosynthesis, and Ultrastructural Alterations of Torreya grandis Seedlings

et al. 2016

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“…In this manner, REE can increase the electronic flow in the photochemical phase, decreasing energy dissipation to other processes besides the photosynthetic. REE can also increase the potential quantum yield of photosystem II, allowing that the larger electronic flow, caused by REE, be used for production of a greater amount of energy and reducing power, favoring the whole photosynthetic process, and consequently the biomass production in plants [105,[113][114][115].…”

Section: Photosynthesis (Photochemical Phase)mentioning

confidence: 99%

Rare Earth Elements in the Soil Environment

et al. 2016

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Rare earth elements (REE) are a homogenous group of 17 chemical elements in the periodic table that are key to many modern industries including chemicals, consumer electronics, clean energy, transportation, health care, aviation, and defense. Moreover, in recent years, they have been used in agriculture. One of the consequences of their worldwide use is the possible increase of their levels in various environmental compartments. This review addresses major topics concerning the study of REE in the soil environment, with special attention to the latest research findings. The main sources of REE to soils, the contents of REE in soils worldwide, and relevant information on the effects of REE to plants were explored. Ecological and human health risk issues related to the presence of REE in soils were also discussed. Although several findings reported positive effects of REE on plant growth, many questions about their biological role remain unanswered. Therefore, studies concerning the actual mechanism of action of these elements on cellular and physiological processes should be further refined. Even more urgent is to unveil their chemical behavior in soils and the ecological and human health risks that might be associated with the widespread use of REE in our modern society.

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“…It can be found in soil and water, and is readily uptaken by plants. Thus, with regards to agricultural plants growing in these affected areas, the sustentative consumption of high-Cd plant tissue constitutes a significant threat to human health (Wang et al 2013;Wu et al 2014). As a non-essential nutrient, Cd has been shown to influence the absorption, transportation, and usage of both water and essential nutrients while also causing various visible symptoms including chlorosis, wilting and root browning (Ding et al 2013;Gallego et al 2012;Garcia et al 2006;Gratao et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Effects of nitric oxide on alleviating cadmium stress in Typha angustifolia

et al. 2015

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Nitric oxide (NO) is a key signal molecule that is involved in plant response to various abiotic stresses. The present study was conducted to investigate the effects of NO on Typha angustifolia which has been subjected to cadmium stress. Our results showed that sodium nitroprusside (SNP, a NO donor) treatment could significantly mitigate both the Cd (CdCl 2 Á2.5H 2 O)-induced increase of malondialdehyde content in the root and relative electrolyte leakage in the root and leaf. NO demonstrated a reduced or counteractive effect on the Cd-induced increase in the activities of some typical antioxidant enzymes. The Cdinduced changes on the contents of non-protein thiol and phytochelatins in the root could also be reversed by NO. The protected effect of NO is likely achieved through trapping Cd in the root and decreasing Cd accumulation in the leaf and sheath. Furthermore, NO enhanced the allocation of Cd in the cell wall and reduced the distribution of Cd in the soluble fraction of the root and leaf. Differential biosynthesis of ascorbic acid content in some tissues might also be responsible for the protected effect of NO. This study concludes that NO counteracts Cd toxicity strongly in T. angustifolia via regulating antioxidant metabolism and enhancing Cd accumulation in the cell wall of the root.

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Alleviation of cadmium toxicity by cerium in rice seedlings is related to improved photosynthesis, elevated antioxidant enzymes and decreased oxidative stress

Cited by 67 publications

References 37 publications

Magnesium Alleviates Adverse Effects of Lead on Growth, Photosynthesis, and Ultrastructural Alterations of Torreya grandis Seedlings

Magnesium Alleviates Adverse Effects of Lead on Growth, Photosynthesis, and Ultrastructural Alterations of Torreya grandis Seedlings

Rare Earth Elements in the Soil Environment

Effects of nitric oxide on alleviating cadmium stress in Typha angustifolia

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