Objective:To investigate the in vitro antioxidant and antimicrobial activities along with phytochemical screening of organic and aqueous extracts of leaf and stem of Suaeda maritima (Dumort).a mangrove associate from ...Objective:To investigate the in vitro antioxidant and antimicrobial activities along with phytochemical screening of organic and aqueous extracts of leaf and stem of Suaeda maritima (Dumort).a mangrove associate from Bhitarkanika of Odisha.India.Methods:Antioxidant activity of the crode extracts was evaluated in terms of total antioxidant capacity,total phenol content,ascorbic acid content,DPPH radical scavenging,metal chelating,nitric oxide scavenging,and reducing power etc.The antimicrobial activity of the plant was determined by agar well diffusion method along with MIC and BBC carried out by microdilulion techniques against 10 gram positive and gram negative human pathogenic bacteria.The qualitative and qualitative phytochemical screening were carried out by standard biochemical assays.Results: Out of the seven antioxidant bioassavs,both the leaf and stem extracts were found to posses strong antioxidant properties of 70%to 92%for phenol,total antioxidant capacity,DPPH free radical scavenging aclivitv and fairly good ascorbic acid content,metal chelating(1.33%-22.55%). reducing power(0.01-0.12) and nitric oxide scavenging(0.84%-66.99%) activities.Out of the four extracts evaluated for antimicrobial activity,two leaf extracts such as acetone and ethanol showed promising activity against four pathogenic bacteria and one stem methanol extracts against one pathogenic bacteria when compared with amoxcycillin as standard.The MIC and MBC values of the antimicrobial extracts ranged between 2.5 to 5.0 mg/mL.Screening of phytochemicals showed presence of carbohydrates,protein,tannins,alkaloids and flavonoids in comparatively higher amount than other phytochemicals tested.Conclusions:The present study reveals the presence of potential antioxidants and antimicrobial properties in the plant extract which could be exploited for pharmaceutical application.展开更多
Extremely saline soils are very harsh environments for the growth and survival of most plant species, however, halophytes can grow well. The underlying mechanism of halophyte to resist high saline is not well understo...Extremely saline soils are very harsh environments for the growth and survival of most plant species, however, halophytes can grow well. The underlying mechanism of halophyte to resist high saline is not well understood by us. This study was conducted at the potash mine near the Lop Nur, China, where the effects of the halophyte Suaeda salsa L. on the saline-alkaline soils and its growth and sustainability were investigated. Four plots（in which the salt encrustation layers were removed）, with different soil treatments were evaluated：（1） undisturbed soil, with no additional treatment（T1）;（2） the slag soil zone, in which a 40-cm layer of slag was placed on the undisturbed soil surface（T2）;（3） slag＋sandy soil, in which a 20-cm layer of slag was placed in the lower layer and 20 cm of sandy soil, taken from an area about 70 km away from Lop Nur potash mine, where Tamarix species were growing, was placed in the upper layer（T3）; and（4） a 40-cm sandy soil layer taken from the area where Tamarix species were growing was placed on undisturbed soil（T4）. Soil nutrient contents increased in the four treatments, but salt content only decreased in the T1 treatment. Salt content in the T4 treatment increased over the two-year period, which may be partly attributed to salt deposition from wind-blown dust within the mine and salt accumulation within the surface soil（0–20 cm） in response to high evaporative demands. The S. salsa plants exhibited greater improvements in growth under the T4 treatment than under the T1, T2, and T3 treatments, which demonstrated that low levels of salinity are beneficial for the growth of this species. The T1 treatment was sustainable because of its low cost and superior soil improvement characteristics. Therefore, S. salsa plants not only reduced soil salinity and increased soil nutrient levels, but also ameliorated the plant growth environment, which would be beneficial for both the ecological restoration of the Lop Nur area and similar areas throughout the world.展开更多
基金field staffs and forest oivision,Rajnagar for their kind cooperation and support
文摘Objective:To investigate the in vitro antioxidant and antimicrobial activities along with phytochemical screening of organic and aqueous extracts of leaf and stem of Suaeda maritima (Dumort).a mangrove associate from Bhitarkanika of Odisha.India.Methods:Antioxidant activity of the crode extracts was evaluated in terms of total antioxidant capacity,total phenol content,ascorbic acid content,DPPH radical scavenging,metal chelating,nitric oxide scavenging,and reducing power etc.The antimicrobial activity of the plant was determined by agar well diffusion method along with MIC and BBC carried out by microdilulion techniques against 10 gram positive and gram negative human pathogenic bacteria.The qualitative and qualitative phytochemical screening were carried out by standard biochemical assays.Results: Out of the seven antioxidant bioassavs,both the leaf and stem extracts were found to posses strong antioxidant properties of 70%to 92%for phenol,total antioxidant capacity,DPPH free radical scavenging aclivitv and fairly good ascorbic acid content,metal chelating(1.33%-22.55%). reducing power(0.01-0.12) and nitric oxide scavenging(0.84%-66.99%) activities.Out of the four extracts evaluated for antimicrobial activity,two leaf extracts such as acetone and ethanol showed promising activity against four pathogenic bacteria and one stem methanol extracts against one pathogenic bacteria when compared with amoxcycillin as standard.The MIC and MBC values of the antimicrobial extracts ranged between 2.5 to 5.0 mg/mL.Screening of phytochemicals showed presence of carbohydrates,protein,tannins,alkaloids and flavonoids in comparatively higher amount than other phytochemicals tested.Conclusions:The present study reveals the presence of potential antioxidants and antimicrobial properties in the plant extract which could be exploited for pharmaceutical application.
基金supported by the Youth Innovation Promotion Association of Chinese Academy of Sciences (2017476)the National High-level Personnel Special Support Program+3 种基金Xinjiang Youth Science and Technology Innovation Leader Project (QN2016BS0162)the National Key Research and Development Program (2017YFSF03024105)the National Natural Science Foundation of China (31700423,31300449)the Xinjiang Uygur Autonomous Region Science and Technology Support Project (201433101)
文摘Extremely saline soils are very harsh environments for the growth and survival of most plant species, however, halophytes can grow well. The underlying mechanism of halophyte to resist high saline is not well understood by us. This study was conducted at the potash mine near the Lop Nur, China, where the effects of the halophyte Suaeda salsa L. on the saline-alkaline soils and its growth and sustainability were investigated. Four plots（in which the salt encrustation layers were removed）, with different soil treatments were evaluated：（1） undisturbed soil, with no additional treatment（T1）;（2） the slag soil zone, in which a 40-cm layer of slag was placed on the undisturbed soil surface（T2）;（3） slag＋sandy soil, in which a 20-cm layer of slag was placed in the lower layer and 20 cm of sandy soil, taken from an area about 70 km away from Lop Nur potash mine, where Tamarix species were growing, was placed in the upper layer（T3）; and（4） a 40-cm sandy soil layer taken from the area where Tamarix species were growing was placed on undisturbed soil（T4）. Soil nutrient contents increased in the four treatments, but salt content only decreased in the T1 treatment. Salt content in the T4 treatment increased over the two-year period, which may be partly attributed to salt deposition from wind-blown dust within the mine and salt accumulation within the surface soil（0–20 cm） in response to high evaporative demands. The S. salsa plants exhibited greater improvements in growth under the T4 treatment than under the T1, T2, and T3 treatments, which demonstrated that low levels of salinity are beneficial for the growth of this species. The T1 treatment was sustainable because of its low cost and superior soil improvement characteristics. Therefore, S. salsa plants not only reduced soil salinity and increased soil nutrient levels, but also ameliorated the plant growth environment, which would be beneficial for both the ecological restoration of the Lop Nur area and similar areas throughout the world.
