Antibiotic Activity of Bryophytes

Banerjee, Rahul; Sen, S. P.

doi:10.2307/3242073

Cited by 67 publications

(39 citation statements)

References 10 publications

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“…In hummock tundra the dominant plant species of hummocks are sedges and dwarf shrubs, whereas the interhummock areas are predominantly colonized by mosses (Table 2). Mosses are generally thought to slow down nutrient turnover and decomposition, because of their recalcitrant litter and abundant antimicrobial substances (Aerts et al, 1999;Banerjee and Sen, 1979;Basile et al, 1999;Turetsky, 2003;Malmer et al, 2003). However, we found significantly higher N-mineralization rates in interhummock areas under mosses.…”

Section: Effects Of Plant Functional Typescontrasting

confidence: 51%

Microtopography and Plant-Cover Controls on Nitrogen Dynamics in Hummock Tundra Ecosystems in Siberia

Biasi

Wanek

Rusalimova

et al. 2005

Arctic, Antarctic, and Alpine Research

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Section: Effects Of Plant Functional Typescontrasting

confidence: 51%

Microtopography and Plant-Cover Controls on Nitrogen Dynamics in Hummock Tundra Ecosystems in Siberia

Biasi

Wanek

Rusalimova

et al. 2005

Arctic, Antarctic, and Alpine Research

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“…In a comparison of three pairs of adjacent upland and peatland sites in eastern Canada, Moore and others (2005) were unable to detect major differences after 6 years in decomposition rates of ten foliar litters. The effect of litter chemistry, such as N concentration and lignin content, on decomposition rates has been postulated (for example, Limpens and Berendse 2003;Moore and others 2005) but may be of limited applicability in peatlands where moss chemistry may play an important role (Clymo 1965;Banerjee and Sen 1979;Painter 1991;Johnson and Damman 1993;Verhoven and Toth 1995;Verhoven and Liefveld 1997;Turetsky 2003).…”

Section: Introductionmentioning

confidence: 99%

Litter Decomposition in Temperate Peatland Ecosystems: The Effect of Substrate and Site

2007

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The large accumulation of organic matter in peatlands is primarily caused by slow rates of litter decomposition. We determined rates of decomposition of major peat-forming litters of vascular plants and mosses at five sites: a poor fen in New Hampshire and a bog hummock, a poor fen, a beaver pond margin and a beaver pond in Ontario. We used the litterbag technique, retrieving triplicate litterbags six or seven times over 3-5 years, and found that simple exponential decay and continuous-quality non-linear regression models could adequately characterize the decomposition in most cases. Within each site, the rate of decomposition at the surface was generally Typha latifolia leaves = Chamaedaphne calyculata leaves = Carex leaves > Chamaedaphne calyculata stems > hummock Sphagnum = lawn/hollow Sphagnum, with exponential decay constant (k) values generally ranging from 0.05 to 0.37 and continuous-quality model initial quality (q 0 ) values ranging from 1.0 (arbitrarily set for Typha leaves) to 0.7 (Sphagnum). In general, surface decay rates were slowest at the bog hummock site, which had the lowest water table, and in the beaver pond, which was inundated, and fastest at the fens. The continuous-quality model site decomposition parameter (u 0 ) ranged from 0.80 to 0.17. Analysis of original litter samples for carbon, nitrogen and proximate fractions revealed a relatively poor explanation of decomposition rates, as defined by k and q 0 , compared to most well-drained ecosystems. Three litters, roots of sedge and a shrub and Typha leaves, were placed at depths of 10, 30 and 60 cm at the sites. Decomposition rates decreased with depth at each site, with k means of 0.15, 0.08 and 0.05 y )1 at 10, 30and 60 cm, respectively, and u 0 of 0.25, 0.13 and 0.07. These differences are primarily related to the position of the water table at each site and to a lesser extent the cooler temperatures in the lower layers of the peat. The distinction between bog and fen was less important than the position of the water table.These results show that we can characterize decomposition rates of surface litter in northern peatlands, but given the large primary productivity below-ground in these ecosystems, and the differential rates of decomposition with depth, subsurface input and decomposition of organic matter is an important and relatively uncertain attribute.

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“…Bryophytes treat illness of cardiovascular system, tonsillitis, bronchitis, skin diseases and burns. They also possess anticancer and antimicrobial activity due to their unique chemical constituents (Banerjee &Sen, 1979 andAskawa, 1990). Plagiochila fasciculate (member of Bryophytes) shows inhibitory effect on virus (Herpes simplex type 1, Polio type 1) and bacteria (Bacillus subtilis, E.coli, Candida albicans and Cladosporium resinae) (Lorimeres & Perry, 1994).…”

Section: Introductionmentioning

confidence: 99%

An Evaluation of the Antibacterial and Antiviral Activities of Some Bryophytes

Abdel-Shafi

Hussein

Sabaa

et al. 2017

Egypt. J. Microbiol.

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THIS STUDY screen the antibacterial and antiviral activities of some bryophytes extracts. The pathogenic bacteria Listeria monocytogenes LMG 10470 (L. monocytogenes), Escherichia coli LMG 8223 (E. coli), Bacillus cereus ATCC 14579 (B. cereus) and Pseudomonas aeruginosa LMG 8029 (P. aeruginosa) were inhibited by the aqueous methanolic extracts (ME) of Imbibryum sp., Barbula convoluta and Trichostomum sp.. The mixture of Imbibryum sp.extract and tetracycline have synergistic effect against P. aeruginosa while the mixing of Trichostomum sp. extract with tetracycline has antagonistic effect against P. aeruginosa.Scanning Electron Microscopy (SEM) of P. aeruginosa, treated with ME of Barbula convolute, Imbibryum sp. and Trichostomum sp.indicated sheath surrounded the bacteria, signs of irregular wrinkled outer surface, adhesion and aggregation of damaged cells, malformations in bacterial shape compared to untreated bacterial control. The bryophyte species screened exhibiting considerable antiviral activity against zucchini yellow mosaic virus (ZYMV), so the bryophytes have been identified as a new source of antiviral activity. The highest degree of antiviral activity was shown ME of Barbula convoluta, Imbibryum sp. and Trichostomum sp.against ZYMV (94, 92 and 90%, respectively). The tested cucumber plants which mechanically infected by ZYMV and treated with different extracts of the most potent bryophytes (Imbibryum sp), contain high amount of phenolic compounds. The highest contents of total phenol are detected in infected cucumber plant, which treated with benzene extract of Imbibryum sp.,(3.48 mg/g fresh wt) followed by methanol extract (3.19 mg/g fresh wt). The bryophytes extracts have no toxic effect in Wistar Albino rats.

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Antibiotic Activity of Bryophytes

Cited by 67 publications

References 10 publications

Microtopography and Plant-Cover Controls on Nitrogen Dynamics in Hummock Tundra Ecosystems in Siberia

Microtopography and Plant-Cover Controls on Nitrogen Dynamics in Hummock Tundra Ecosystems in Siberia

Litter Decomposition in Temperate Peatland Ecosystems: The Effect of Substrate and Site

An Evaluation of the Antibacterial and Antiviral Activities of Some Bryophytes

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