Enhanced Phytoremediation of Salt-impacted Soils Using Plant Growth-promoting Rhizobacteria (pgpr) PDF Download
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Author: Shan Shan Wu
Publisher:
ISBN:
Category :
Languages : en
Pages : 153
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Book Description
Soil salinity is a widespread problem that limits crop yield throughout the world. The accumulation of soluble salts in the soil can inhibit plant growth by increasing the osmotic potential of interstitial water, inducing ion toxicity and nutrient imbalances in plants. Over the last decade, considerable effort has been put into developing economical and effective methods to reclaim these damaged soils. Phytoremediation is a technique that uses plants to extract, contain, immobilize and degrade contaminants in soil. The most common process for salt bioremediation is phytoextraction which uses plants to accumulate salt in the shoots, which is then removed by harvesting the foliage. As developing significant plant biomass in saline soils is an issue, a group of free-living rhizobacteria, called plant growth promoting rhizobacteria (PGPR), can be applied to plant seeds to aid plant growth by alleviating salt stress. The principle objective of this research was to test the efficacy of PGPR in improving the growth of plants on salt-impacted soils through greenhouse and field studies. In this research, previously isolated PGPR strains of Pseudomonas putida UW3, Pseudomonas putida UW4, and Pseudomonas corrugata CMH3 were applied to barley (Hordeum valgare C.V. AC ranger), oats (Avena sativa C.V. CDC baler), tall wheatgrass (Agropyron elongatum), and tall fescue (festuca arundinacea C.V. Inferno). PGPR effects on plant growth, membrane stability, and photosynthetic activity under salt stress were examined.
Author: Shan Shan Wu
Publisher:
ISBN:
Category :
Languages : en
Pages : 153
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Book Description
Soil salinity is a widespread problem that limits crop yield throughout the world. The accumulation of soluble salts in the soil can inhibit plant growth by increasing the osmotic potential of interstitial water, inducing ion toxicity and nutrient imbalances in plants. Over the last decade, considerable effort has been put into developing economical and effective methods to reclaim these damaged soils. Phytoremediation is a technique that uses plants to extract, contain, immobilize and degrade contaminants in soil. The most common process for salt bioremediation is phytoextraction which uses plants to accumulate salt in the shoots, which is then removed by harvesting the foliage. As developing significant plant biomass in saline soils is an issue, a group of free-living rhizobacteria, called plant growth promoting rhizobacteria (PGPR), can be applied to plant seeds to aid plant growth by alleviating salt stress. The principle objective of this research was to test the efficacy of PGPR in improving the growth of plants on salt-impacted soils through greenhouse and field studies. In this research, previously isolated PGPR strains of Pseudomonas putida UW3, Pseudomonas putida UW4, and Pseudomonas corrugata CMH3 were applied to barley (Hordeum valgare C.V. AC ranger), oats (Avena sativa C.V. CDC baler), tall wheatgrass (Agropyron elongatum), and tall fescue (festuca arundinacea C.V. Inferno). PGPR effects on plant growth, membrane stability, and photosynthetic activity under salt stress were examined.
Author: Sanjay Arora
Publisher: Springer
ISBN: 9783319838977
Category : Nature
Languages : en
Pages : 313
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Book Description
This edited volume focuses on the characterization, reclamation, bioremediation, and phytoremediation of salt affected soils and waterlogged sodic soils. Innovative technologies in managing marginal salt affected lands merit immediate attention in the light of climate change and its impact on crop productivity and environment. The decision-making process related to reclamation and management of vast areas of salt affected soils encompasses consideration of economic viability, environmental sustainability, and social acceptability of different approaches. The chapters in this book highlight the significant environmental and social impacts of different ameliorative techniques used to manage salt affected soils. Readers will discover new knowledge on the distribution, reactions, changes in bio-chemical properties and microbial ecology of salt affected soils through case studies exploring Indian soils. The contributions presented by experts shed new light on techniques such as the restoration of degraded lands by growing halophyte plant species, diversification of crops and introduction of microbes for remediation of salt infested soils, and the use of fluorescent pseudomonads for enhancing crop yields.
Author: Greg MacNeill
Publisher:
ISBN:
Category :
Languages : en
Pages : 107
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Book Description
Soil salinity affects an estimated one billion hectares worldwide. Excess salinity inhibits plant growth, limiting crop production. This is caused by osmotic stress in saline soil, nutrient imbalance and specific ion toxicity. There have been many methods of remediation investigated, including excavation, soil washing and phytoremediation. Phytoremediation involves the growth of plants on impacted soils to degrade or sequester contaminants. The remediation of salts relies on the uptake of ions into plant biomass where the salt is sequestered and the biomass can then be harvested. This method removes the salt from the site and leaves the top soil in place, which aids in revegetation after site remediation is completed. Plant-growth promoting rhizobacteria (PGPR) improves plant growth by lowering the levels of stress ethylene within the plant, thereby increasing the biomass available to sequester ions. The objectives of this research were to investigate the efficiency of phytoremediation of salt impacted soils in field remediation sites.
Author: Naveen Kumar Arora
Publisher: Springer
ISBN: 9789813296633
Category : Science
Languages : en
Pages : 0
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Book Description
The increasing human population and the associated activities have negatively influenced the ecosystems and life on earth. The continuous addition of agrochemicals, heavy metals and industrial wastes/ effluents in the ecosystems have caused great harm, including loss of productivity, biodiversity, climate change and diseases in plants, animals and humans, resulting in increased marginal lands and endangered sustainability of life on earth. Hence, there is an urgent need to reverse the impact of dangerous pollutants through a holistic, sustainable and biotic approach. Bioremediation involves the utilization of biological systems, mainly plants (phytoremediation) or microorganisms or both in combination (rhizoremediation) for the removal or degradation of pollutants and revive the habitats in an eco-friendly manner. Recently, there have been many success stories related to bioremediation involving plants or plant-microbe interactions. These success stories are related to the removal of heavy metals, pesticides, polyaromatic hydrocarbons, explosives, radionuclides or reduction of biological oxygen demand, total dissolved solids, total suspended solids, oil spills in water bodies. Rhizoremediation has also been successfully used for reclamation of saline or marginal soils. With the range of pollutants and the total area (on earth) covered by these toxic chemicals, it is important that these eco-friendly technologies be utilized in a better way. The book throws light on the recent happenings, research and success stories related to bioremediation of polluted habitats through phytoremediation or rhizoremediation. The book also highlights some of the significantly important plant and microbial species involved in remediation, the physiology, biochemistry and the mechanisms of remediation by various plants and microbes, and suggestions for future improvement of bioremediation technology.
Author: Pei-Chun Chang
Publisher:
ISBN: 9780494436097
Category :
Languages : en
Pages : 141
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Book Description
Upstream oil and gas production has caused soil salinity problems across western Canada. In this work we investigated the use of ACC (1-aminocyclopropane-1-carboxylate) deaminase-producing plant growth-promoting rhizobacteria (PGPR) and the arbuscular mycorrhizal fungus (AMF) Glomus intraradices to enhance the efficiency and feasibility of phytoremediation of saline soils. This work involved laboratory and field research for three sites in south east Saskatchewan, Canada.
Author: Haitang Jay Wang
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Jolanta Gurska
Publisher:
ISBN:
Category :
Languages : en
Pages : 266
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Book Description
Phytoremediation is a cost-effective and environmentally conscious technology that utilizes plants to remediate a variety of contaminants from the soil. Petroleum hydrocarbons (PHC), as a result of their widespread use are a common environmental problem in soils, and one where phytoremediation would be well suited as a solution. Phytoremediation of PHC proceeds mainly through microbial degradation in plant root zone (rhizosphere) and plant degradation of PHC. The high concentrations of PHC at many sites are an impediment to phytoremediation. The toxicity of PHC hinders plant growth and prohibits remediation. One way to overcome this decrease in plant growth is by employing plant growth promoting rhizobacteria (PGPR). PGPR are naturally present soil bacteria that influence plant growth through direct and indirect methods, and can ultimately act to reduce plant stress. If PHC toxicity could be overcome with the use of PGPR, phytoremediation may become a viable option for remediation of PHC contaminated sites. This study was divided into a field component and a laboratory component, both of which focused on different aspects of phytoremediation of PHC enhanced with PGPR. Previous studies have shown that PGPR-enhanced phytoremediation was successful in the greenhouse. As a result of this, long-term field studies of this system were initiated. Effectiveness was evaluated by assessing plant performance and remediation of PHC in the field. The long-term impact of PGPR on the resident microbial community was evaluated, to ensure there was no detriment to microbial diversity. Following success in the field, lab studies were performed to evaluate the effect of PGPR and PHC by examining both physiological and molecular changes in plants exposed to PHC where PGPR effects were demonstrated. When PGPR were used in field experiments to facilitate phytoremediation, PHC toxicity was alleviated, and this was evident through improved germination, increased plant growth, and improved photosynthetic performance of selected grass plant species. These findings were corroborated at two field sites, one with high and one with low levels of weathered PHC. Addition of PGPR consistently improved remediation at each site. When remediation of PHC was followed over a period of three years, it was found that despite increased plant growth and increased remediation with addition of PGPR, remediation slowed in the second and third year of growth; this was particularly evident at the site with low levels of PHC.
Author: Manoj Kumar
Publisher: Springer
ISBN: 9811383359
Category : Technology & Engineering
Languages : en
Pages : 253
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Book Description
This book discusses the role of salt in current agricultural approaches, including the low salt tolerance of agricultural crops and trees, impact of saline soils, and salt-resistant plants. Halophytes are extremely salt tolerant plants, which are able to grow and survive under salt at concentrations as high as 5 g/l by maintaining negative water potential. The salt-tolerant microbes inhabiting the rhizospheres of halophytes may contribute to their salt tolerance, and the rhizospheres of halophytic plants provide an ideal opportunity for isolating various groups of salt-tolerant microbes that could enhance the growth of different crops under salinity stress. The book offers an overview of salt-tolerant microbes' ability to increase plant tolerance to salt to facilitate plant growth, the potential of the halophytes’ rhizospheres as a reservoir of beneficial salt-tolerant microbes, their future application as bio-inoculants in agriculture and a valuable resource for an alternative way of improving crop tolerance to salinity and promoting saline soil-based agriculture. This special collection of reviews highlights some of the recent advances in applied aspects of plant (halophytes)-microbe interactions and their contribution towards eco-friendly approaches saline soil-based agriculture.
Author: Jean-Louis Morel
Publisher: Springer Science & Business Media
ISBN: 140204688X
Category : Science
Languages : en
Pages : 357
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Book Description
This is the first book aimed at development of a common language among scientists working in the field of Phytoremediation. Authors of the main chapters are leading scientists in this field. Some of them were among the first ones to have suggested the use of hyperaccumulator plants for extraction of metals from soils. Manuscripts based on lectures presented at the ASI have been revised here to take into account ASI participants’ comments and suggestions.
Author: Abid A. Ansari
Publisher: Springer
ISBN: 3319523813
Category : Science
Languages : en
Pages : 511
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Book Description
This text details the plant-assisted remediation method, “phytoremediation”, which involves the interaction of plant roots and associated rhizospheric microorganisms for the remediation of soil contaminated with high levels of metals, pesticides, solvents, radionuclides, explosives, crude oil, organic compounds and various other contaminants. Many chapters highlight and compare the efficiency and economic advantages of phytoremediation to currently practiced soil and water treatment practices. Volume 5 of Phytoremediation: Management of Environmental Contaminants provides the capstone of the series. Taken together, the five volumes provide a broad–based global synopsis of the current applications of phytoremediation using plants and the microbial communities associated with their roots to decontaminate terrestrial and aquatic ecosystems.
