Effects of copper and cadmium on heavy metal polluted waterbody restoration by duckweed (Lemna minor)

Hou, Wenhua; Chen, Xiao; Song, Guanling; Wang, Qunhui; Chang, Chein Chi

doi:10.1016/j.plaphy.2006.12.005

Cited by 304 publications

(169 citation statements)

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“…The reduced photosynthetic activity is an effect commonly noticed in plants exposed to heavy metal (Frankart et al, 2002;Hanikenne, 2003;Hou et al, 2007;Hu et al, 2007;Küpper et al, 2007;Li et al, 2008). In our experiment, significant correlation was obtained between Fv/Fm and excess iron and copper (r 5 20.9742, r 5 20.9790, P \ 0.05), suggesting ROS caused by excess metal concentration damaged photosynthetic apparatuses severely.…”

Section: Discussionsupporting

confidence: 61%

“…High accumulation properties of duckweed for metal species have already been documented in previous studies (Bassi and Sharma, 1993;Li and Xiong, 2004a,b;Montvydiene and Marčiulioniene, 2004;Mukherjee et al, 2004;Drost et al, 2007;Horvat et al, 2007;Hou et al, 2007;Razinger et al, 2007Razinger et al, , 2008. Compared with Lemna minor Linn., S. polyrrhiza (L.) Schleid had much more capacity of metal accumulation in this study (Fig.…”

Section: Discussionsupporting

confidence: 52%

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Effect of excess iron and copper on physiology of aquatic plant Spirodela polyrrhiza (L.) Schleid

Xing

Huang

Liu

2009

Environmental Toxicology

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To elucidate effect of chemical reagents addition on growth of aquatic plants in restoration of aquatic ecosystem, Spirodela polyrrhiza (L.) Schleid was used to evaluate its physiological responses to excess iron (Fe 31 ) and copper (Cu 21 ) in the study. Results showed that accumulation of iron and copper both reached maximum at 100 mg L 21 iron or copper after 24 h short-term stress, but excess iron and copper caused plants necrosis or death and colonies disintegration as well as roots abscission at excess metal concentrations except for 1 mg L 21 iron. Significant differences in chlorophyll fluorescence (Fv/Fm) were observed at 1-100 mg L 21 iron or copper. The synthesis of chlorophyll and protein as well as carbohydrate and the uptake of phosphate and nitrogen were inhibited seriously by excess iron and copper. Proline content decreased with increasing iron or copper concentration, however, MDA content increased with increasing iron or copper concentration. # 2009 Wiley Periodicals, Inc. Environ Toxicol 25: 103-112, 2010.

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Section: Discussionsupporting

confidence: 61%

Section: Discussionsupporting

confidence: 52%

Effect of excess iron and copper on physiology of aquatic plant Spirodela polyrrhiza (L.) Schleid

Xing

Huang

Liu

2009

Environmental Toxicology

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“…This may have occurred because duckweed is able to accumulate enough of the compound with reducing action by absorbing some heavy metals such as mercury, copper, and lead. 41,42 These compounds would then remain in the fermentation medium after duckweed pretreatment, providing adequate reducing power to meet the needs for C. acetobutylicum growth. Clearly, reducing power is not a limiting factor for butanol fermentation in acid hydrolysate of duckweed.…”

Section: ■ Resultsmentioning

confidence: 99%

Use of Duckweed (Landoltia punctata) as a Fermentation Substrate for the Production of Higher Alcohols as Biofuels

Zhao

Juan

et al. 2014

Energy Fuels

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Duckweed (Lemnaceae) is a family of aquatic plants with potential for use as the next generation of alternative energy feedstocks, yet little related information about producing higher alcohols from duckweed has been published. We investigated the process of producing higher alcohols from duckweed via fermentation. Results showed that these plants have a promising future as the basis for developing biofuels. This could be achieved through fermentation by yeasts, producing not only traditional forms of energy such as ethanol but also higher alcohols with high energy yields through bioconversion by Clostridium acetobutylicum, mutant yeast strains, and bioengineered strains of Escherichia coli. The concentrations of butanol and total solvent produced via fermentation by C. acetobutylicum CICC 8012 were 12.03 and 20.03 g/L using acid hydrolysate of duckweed versus 12.33 and 20.05 g/L using enzymatic hydrolysate. The yields obtained of 24.06 g/L ethanol and 680.36 mg/L of isopentanol from duckweed using acid hydrolysate are 15 times higher than what could be obtained through the fermentation of the mutation of yeast. In addition, we were able to obtain yields of 16.27 mg/L butanol, 24.68 mg/L isopentanol, and 195.85 mg/L pentanol from the acid hydrolysate of duckweed via fermentation by the bioengineered strains of E. coli. Our results illustrated that duckweed represent an ideal fermentation substrate: they require only simple pretreatment, without the need for supplementary nitrogen or strengthening with redox agents. This provides a foundation for further development of industrialized biofuel production using duckweed. ■ INTRODUCTIONGiven the widely recognized unsustainability of depending solely on petroleum for development and environmental problems, increasing efforts have been directed at synthesizing biofuels from renewable resources. 1−3 To date, several such renewable sources of energy have been developed, including ethanol from sugar cane, corn, and cassava and biodiesel from various plant oils such as coconut, palm, and rapeseed, which are also the sources of food for people and livestock. The increasing demand for ethanol and other biofuels could contribute to a global food shortage. Given this concern about the competing uses of resources for "food versus fuel", the rising scarcity and price of fossil fuels, and the need to protect global environmental resources and food security, there is an even greater need to find new, renewable, nonfood sources for biofuel production.The use of agricultural waste or byproducts and nonfood crop sources as cheap fermentation substrates to produce biofuels has high economic appeal. 4 Among nonfood crops, duckweed, a family of fast-growing, floating species that represent the world's smallest and simplest flowering plants, has been proposed as an inexpensive, sustainable source of plant biomass for producing biofuels. 5 There are many advantages to using duckweed in this regard, compared to other starch feedstocks such as corn and cassava. 6 First, duckweed h...

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“…In the case of 30 µg Cd mL -1 exposure, the Cd contents in the roots (13296.2±1962.6 µg g -1 wet weight) were higher than 13 those in the corresponding stems (3377.7±208.0 µg g -1 wet weight) and leaves (4491.4±300.3 µg g -1 wet weight). The accumulation of Cd in the various parts of aquatic macrophytes under laboratory conditions has been reported in several species of aquatic plants such as Limnocharis flava (Abhilash et al 2009), Ipomea auqatica , Potamogeton natans (Fritioff and Greger 2006), Lemna minor (Hou et al 2007), and Elodea canadensis (Fritioff and Greger 2007). Cd concentrations were reported to be higher in the roots in most of these studies.…”

Section: Accumulation In the Plantmentioning

confidence: 87%

Phytofiltration of Arsenic and Cadmium From the Water Environment UsingMicranthemum Umbrosum(J.F. Gmel) S.F. Blake As A Hyperaccumulator

Islam

Ueno

Sikder

2013

International Journal of Phytoremediation

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Effects of copper and cadmium on heavy metal polluted waterbody restoration by duckweed (Lemna minor)

Cited by 304 publications

References 42 publications

Effect of excess iron and copper on physiology of aquatic plant Spirodela polyrrhiza (L.) Schleid

Effect of excess iron and copper on physiology of aquatic plant Spirodela polyrrhiza (L.) Schleid

Use of Duckweed (Landoltia punctata) as a Fermentation Substrate for the Production of Higher Alcohols as Biofuels

Phytofiltration of Arsenic and Cadmium From the Water Environment UsingMicranthemum Umbrosum(J.F. Gmel) S.F. Blake As A Hyperaccumulator

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