Cadmium-induced functional and ultrastructural alterations in roots of two transgenic cotton cultivars

Daud, M. K.

doi:10.1016/j.jhazmat.2008.03.128

Cited by 129 publications

(83 citation statements)

References 52 publications

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“…1 and Table 3). Vacuolar/vesicular compartmentalization of HMs has been frequently observed in plant tissues and is considered to be another "first line" mechanism of detoxification since it restricts the phytotoxicity of metals by isolating them from the cytoplasm/chloroplast (Hall, 2002;Liu and Kottke, 2004a,b;Jin et al, 2008;Daud et al, 2009;Jabeen et al, 2009).…”

Section: Discussionmentioning

confidence: 99%

Different strategies to achieve Pb-tolerance by the two Trebouxia algae coexisting in the lichen Ramalina farinacea

Álvarez

Hoyo

García‐Breijo

et al. 2012

Journal of Plant Physiology

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Elsevier Álvarez, R.; del Hoyo, A.; García Breijo, FJ.; Reig Armiñana, J.; Del Campo, E.; Guera, A.; Casano, L. (2012). Different strategies to achieve Pb-tolerance by the two Trebouxia algae coexisting in the lichen Ramalina farinacea. Lichen thalli are permeable to airborne substances, including heavy metals, which are harmful to cell metabolism. Ramalina farinacea shows a moderate tolerance to Pb. This lichen comprises two Trebouxia phycobionts, provisionally referred to as TR1 and TR9, with distinct physiological responses to acute oxidative stress. Thus, there is a more severe decay in photosynthesis and photosynthetic pigments in TR1 than in TR9. Similarly, under oxidative stress, antioxidant enzymes and HSP70 protein decrease in TR1 but increase in TR9. Since Pb toxicity is associated with increased ROS formation, we hypothesized greater Pb tolerance in this phycobiont. Accordingly, the aim of the present study was to characterize the physiological differences in the responses of TR1 and TR9 to Pb exposure. Liquid cultures of isolated phycobionts were incubated for 7 days in the presence of Pb(NO 3 ) 2 . Thereafter, extracellular and intracellular Pb accumulation, photosynthetic pigments, and photosynthesis (as modulated chlorophyll fluorescence) were analyzed along with the antioxidant enzymes glutathione reductase (GR), superoxide dismutase (SOD), ascorbate peroxidase (APx), and catalase (CAT), and the stress-related protein HSP70. Pb uptake increased with the amount of supplied Pb in both algae. However, while significantly more metal was immobilized extracellularly by TR9, the amount of intracellular Pb accumulation was three times higher in TR1. In neither of the phycobionts were significant effects on photosynthetic pigments or photosynthetic electron transport observed. While under control conditions GR, SOD, and APx levels were significantly higher in TR1 than in TR9, only in the latter were these enzymes induced by Pb. This resulted in quantitatively similar antioxidant activities in the two algae when exposed to Pb. In conclusion, the phycobionts of R. farinacea make use of two different strategies against stress, in which the integration of distinct anatomical and physiological features affords similar levels of Pb tolerance.

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Section: Discussionmentioning

confidence: 99%

Different strategies to achieve Pb-tolerance by the two Trebouxia algae coexisting in the lichen Ramalina farinacea

Álvarez

Hoyo

García‐Breijo

et al. 2012

Journal of Plant Physiology

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“…Of heavy metals, cadmium (Cd) is an important environmental contaminant (Clemens 2006). Plants are directly affected by Cd because it has been accumulated in soils for many decades (Daud et al 2009). Consequently, it can enter into a plant very rapidly accumulating in roots and translocated to the upper parts of the plant (Sanita di Toppi & Gabbrielli 1999).…”

Section: Introductionmentioning

confidence: 99%

“…Cadmium has no known biological function and is extremely toxic, even at low concentration. The phytotoxic effects of Cd could probably be a consequence of its interference with a number of metabolic processes (Lin et al 2007;Daud et al 2009). Cd stress generally reduces plants growth (Ci et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Ecophysiological responses of almond (Prunus dulcis) seedlings to cadmium stress

Elloumi¹,

Zouari

Chaâri

et al. 2014

Biologia

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Almond (Prunus dulcis L.) seedlings were exposed to 0, 25, 50, 100 and 150 µM of CdCl2 in a solution culture under controlled conditions. The effects of cadmium (Cd) exposure on almond seedlings growth, stomatal architecture, gas exchange and physiological parameters were investigated. Under cadmium stress conditions, significant decrease in fresh and dry weight, length of shoot and chlorophyll content were observed. Stomatal conductance, transpiration and net photosynthetic rates were generally depressed by Cd stress, despite stomatal frequency values and stomatal pore size remained unchanged. Exposure to Cd severely restricted the starch content and increased soluble sugars.

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“…Both Lolium species had higher values of the root morphological parameters (including root length, surface area, volume, and tip numbers) at elevated levels of CO 2 when compared to the ambient CO 2 control, showing that elevated levels of CO 2 increased root elongation and root branching. Corresponding to the response of plant growth to elevated levels of CO 2 , Cd treatments affected root tip number, root length, surface area, volume, and number of fine roots as reported in Daud et al (2009) and Li et al (2009). Generally, root length, surface area, and volume are more sensitive to Cd than root tip number (Ci et al, 2009).…”

Section: Combined Effect Of CD Concentrations and Elevated Co 2 Levelmentioning

confidence: 94%

Effects of elevated CO2 levels on root morphological traits and Cd uptakes of two Lolium species under Cd stress

Jia

Tang²,

Ju³

et al. 2011

J. Zhejiang Univ. Sci. B

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This study was conducted to investigate the combined effects of elevated CO 2 levels and cadmium (Cd) on the root morphological traits and Cd accumulation in Lolium multiflorum Lam. and Lolium perenne L. exposed to two CO 2 levels (360 and 1 000 μl/L) and three Cd levels (0, 4, and 16 mg/L) under hydroponic conditions. The results show that elevated levels of CO 2 increased shoot biomass more, compared to root biomass, but decreased Cd concentrations in all plant tissues. Cd exposure caused toxicity to both Lolium species, as shown by the restrictions of the root morphological parameters including root length, surface area, volume, and tip numbers. These parameters were significantly higher under elevated levels of CO 2 than under ambient CO 2 , especially for the number of fine roots. The increases in magnitudes of those parameters triggered by elevated levels of CO 2 under Cd stress were more than those under non-Cd stress, suggesting an ameliorated Cd stress under elevated levels of CO 2 . The total Cd uptake per pot, calculated on the basis of biomass, was significantly greater under elevated levels of CO 2 than under ambient CO 2 . Ameliorated Cd toxicity, decreased Cd concentration, and altered root morphological traits in both Lolium species under elevated levels of CO 2 may have implications in food safety and phytoremediation.

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Cadmium-induced functional and ultrastructural alterations in roots of two transgenic cotton cultivars

Cited by 129 publications

References 52 publications

Different strategies to achieve Pb-tolerance by the two Trebouxia algae coexisting in the lichen Ramalina farinacea

Different strategies to achieve Pb-tolerance by the two Trebouxia algae coexisting in the lichen Ramalina farinacea

Ecophysiological responses of almond (Prunus dulcis) seedlings to cadmium stress

Effects of elevated CO2 levels on root morphological traits and Cd uptakes of two Lolium species under Cd stress

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