Mushroom as a product and their role in mycoremediation
© Kulshreshtha et al.;licensee Springer 2014
Received: 15 January 2014
Accepted: 17 January 2014
Published: 1 April 2014
Mushroom has been used for consumption as product for a long time due to their flavor and richness in protein. Mushrooms are also known as mycoremediation tool because of their use in remediation of different types of pollutants. Mycoremediation relies on the efficient enzymes, produced by mushroom, for the degradation of various types of substrate and pollutants. Besides waste degradation, mushroom produced a vendible product for consumption. However, sometimes they absorb the pollutant in their mycelium (biosorption process) and cannot be consumed due to absorbed toxicants. This article reviews the achievement and current status of mycoremediation technology based on mushroom cultivation for the remediation of waste and also emphasizes on the importance of mushroom as product. This critical review is also focused on the safety aspects of mushroom cultivation on waste.
Biological approaches based on industrial and environmental biotechnology is focusing on the development of “clean technologies" which emphasizes on the maximum production, reduced waste generation, treatment and conversion of waste in some useful form. Further, these clean technologies focus on the use of biological methods for the remediation of waste. One such biological method is mycoremediation which is based on the use of fungi and mushroom for the removal of waste from the environment. The mushrooms and other fungi possess enzymatic machinery for the degradation of waste/pollutants and therefore, can be applied for a wide variety of pollutants (Purnomo et al. ; Kulshreshtha et al. ). However, mushrooms, a basidiomycetous fungus, are becoming more popular nowadays for remediation purposes because it is not only a bioremediation tool but also provide mycelium or fruiting bodies as a source of protein. The efficiency of mushroom species in producing food protein in the form of biomass or fruiting bodies from different wastes lies in their ability to degrade waste via secretion of a variety of hydrolyzing and oxidizing enzymes (Kuforiji and Fasidi ; Zhu et al. ). This has attracted research attention in the field of mushroom cultivation and waste remediation.
Many reports have published to emphasize the role of mushroom in bioremediation of wastes by the process of biodegradation, biosorption and bioconversion (Akinyele et al. , Kulshreshtha et al. [2013a]; Kumhomkul and Panich-pat ; Lamrood and Ralegankar ). Many scientists have studied the role of different enzymes in the degradation process; degradation products formed by it and conditions affecting the degradation process (Novotný et al. ; Akinyele et al. ; Zhu et al. ). However, safety aspects of the process and products have not been reported so far. There is scarcity of reports indicating the pros and cons of mushroom cultivation on wastes and their further utilization as food. Moreover, mushroom as a product is meagerly reported.
Keeping this in mind, in this review we are discussing the use of mushroom as a biological tool for cleanup the environment. Mushroom is not only a mycoremediation tool but also a product. Mushroom fruiting bodies generated on industrial and agro-industrial wastes are considered as a product. We have also focused on the safety aspects of mushroom cultivation on waste.
Mushroom as a product
Role of mushroom as an important product
As a product
Pleurotus, Agaricus, Ganoderma Schizophyllan commune, Grifola frondosa Coriolus versicolor, Ganoderma lucidum,
Used as medicine to boost immune responses against cancer
Possess antimutagenic or antigenotoxic power to fight against cancer
Ganoderma lucidum, Phellinus rimosus, Pleurotus florida and Pleurotus pulmonaris
Used as antioxidant and antitumor agent
Ajith and Janardhanan ()
Used as food
Edible mushrooms are highly nutritious and can be compared with eggs, milk and meat (Oei ). Mushroom is a protein rich food and has been considered as the source of single cell protein. These are easily digestible and possess a high amount of amino acids but lacks cholesterol. These possess high quantities of fibers, few sugars and low calories and a high quantity of the amino acids phenylalanine, threonine and tyrosine.
As far as the nutrient profile of mushroom are concerned, these are influenced by many factors including the type of substrate on which these are cultivated. There are some differences in the nutrient content of the mushroom cultivated on different substrates (Mabrouk and Ahwanyi ; Akinyele et al. ; Kulshreshtha et al. [2013b]). However, this change in nutritional content never found to affect their edibility. Therefore, it is still a beneficial technology because it solves two major problems simultaneously i.e. waste accumulation and shortage of proteinaceous food.
Besides, use for edible purpose, mushroom is used for other industrial processes like biopulping and biobleaching. Hence, the importance of this as product cannot be ignored.
Mushroom as mycoremediation tool
Remediation through fungi is also called as mycoremediation. Mycoremediation tool refers to mushrooms and their enzymes due to having ability to degrade a wide variety of environmentally persistent pollutants, transform industrial and agro-industrial wastes into products.
Mycoremediation potential of mushroom
Mushroom uses different methods to decontaminate polluted spots and stimulate the environment. These methods include - (i) Biodegradation (ii) Biosorption (iii) Bioconversion.
Role of mushroom in degradation of pollutants
Mushrooms degraded the plastic and grew on it.
da Luz et al. ()
Mushrooms degraded 2,4-dichlorophenol (DCP) by using vanillin as an activator
Tsujiyama et al. ()
Radioactive cellulosic-based waste
Waste containing mushroom mycellium was solidified with portland cement and then this solidified waste act as first barrier against the release of radiocontaminants
Eskander et al. ()
Jelly sp., Schizophyllum commune and Polyporous sp.
99.75% (Jelly sp.), 97.5% (Schizophyllum commune), 68.5% (Polyporous sp.2) dye was degraded in 10 days
Rajput et al. ()
crude oil was degraded
Olusola and Anslem ()
Coriolus versicolor MKACC 52492
Mushroom possesses ability to degrade Poly-R 478 which decides its suitability to degrade PAH. Lignin-modifying enzymes laccase, manganese-dependent peroxidase (MnP), and lignin peroxidase (LiP)was found to produce for degradation
Jang et al. ()
Mushroom can produce extracellular peroxidases, ligninase (lignin peroxidase, manganese dependent peroxidase and laccase), cellulases, pectinases, xylanases and oxidases (Nyanhongo et al. ). These are able to oxidize recalcitrant pollutants in vitro. These enzymes are typically induced by their substrates.
These enzymes have also been found to degrade nonpolymeric, recalcitrant pollutants such as nitrotoluenes (VanAcken et al. ), PAHs (Hammel et al. ; Johannes et al. ), organic and synthetic dyes (Ollikka et al. ; Heinfling et al. ), and pentachlorophenol (Lin et al. ) under in vitro conditions. Recently, it is reported that mushroom species are able to degrade polymers such as plastics (da Luz et al. ).
The biodegradation mechanism is very complex. The reason is the influence of other biochemical systems and interactions of ligninolytic enzymes with cytochrome P450 monooxygenase system, hydroxyl radicals and the level of H2O2 which are produced by the mushroom.
The second important process of removal of metals/pollutants from the environment by mushroom is - biosorption. Biosorption is considered as an alternative to the remediation of industrial effluents as well as the recovery of metals present in effluent. Biosorption is a process based on the sorption of metallic ions/pollutants/xenobiotics from effluent by live or dried biomass which often exhibits a marked tolerance towards metals and other adverse conditions (Gavrilescu ). Biosorbents can be prepared from mushroom mycelium and spent mushroom compost.
The uptake of pollutants/xenobiotics by mushrooms involves a combination of two processes: (i) bioaccumulation i.e. active metabolism-dependent processes, which includes both transport into the cell and partitioning into intracellular components; and (ii) biosorption i.e. the binding of pollutants to the biomass without requiring metabolic energy. Several chemical processes may be involved in biosorption, including adsorption, ion exchange processes and covalent binding. According to Mar'in et al. (), the polar groups of proteins, amino acids, lipids and structural polysaccharides (chitin, chitosan, glucans) may be involved in the process of biosorption.
Removal of pollutants by biomass of mushroom using biosorption process
Agaricus bisporus, Lactarius piperatus
Cadmium (II) ions
Wild L. piperatus showed higher removal efficiency on Cd(II) ions compared to the cultivated A. bisporus
Nagy et al. ()
Mushroom is efficient in biosorption of Cu (II) ions and hot-alkali treatment increased their affinity for Cu (II) ions
Sutherland and Venkobachar ()
Pleurotus platypus, Agaricus bisporus, Calocybe indica
Copper, Zinc, Iron, Cadmium, Lead, Nickle
Mushrooms are efficient biosorbent for the removal these ions from aqueous solution
Lamrood and Ralegankar ()
Mushroom compost used as biosorbent for removing copper ions from aqueous solution
Luo et al. ()
Pleurotus tuber- regium
Pleurotus tuber-regium biosorb the pollutant heavy metals from the soil artificially contaminated with some heavy metals
Oyetayo et al. ()
Mushroom possess biosorption capacity and mechanism of biosorption was observed
Tay et al. ()
heavy metal Zn
Mushrooms biosorb the heavy metals
Jibran and Milsee Mol ()
Bioconversion of waste by mushroom species
Bioconversion of waste
Handmade paper and cardboard industrial waste
Successfully cultivated. Basidiocarps possessed good nutrient content and no genotoxicity
Kulshreshtha et al. [(2013)]
Extract from the sawdust
Biomass of mushroom was produced in submerged liquid culture were analyzed
Akinyele et al. ()
Agro-industrial residues such as cassava, sugar beet pulp, wheat bran and apple pomase
Enzyme activities were measured during the fermentation of substrates
Akinyele et al. ()
Handmade paper and cardboard industrial waste
Successfully cultivated. Basidiocarps possessed normal morphology and no genotoxicity
Kulshreshtha et al. ()
Cotton waste, rice straw, cocoyam peels and sawdusts of Mansonia altissima, Boscia angustifolia and Khaya ivorensis
Successfully cultivated with good crude protein, crude fat and carbohydrate contents in sporophores.
Kuforiji and Fasidi ()
Pleurotus eous and Lentinus connotus
Paddy straw, sorghum stalk, and banana pseudostem
Waste successfully bioconverted by mushroom with good biological efficiency
Rani et al. ()
Nigerian trees; Terminalia superba, Mansonia altissima, Holoptelia grandis and Miliciaexcelsa
Grow on trees
Jonathan et al. ()
Cotton waste, sawdust of Khaya ivorensis and rice straw
Sclerotia propagated on groundnut shells and cocoyam peels with lipase and phenoloxidase; cellulase, carboxymethyl cellulase enzymatic activities
Kuforiji and Fasidi ()
Successfully convert this waste and qualitative and quantitative changes were also measured
Brienzo et al. ()
Vineyard pruning (VP), barley straw (BS), and wheat straw
Bioconversion of VP waste with shortest primordium formation, highest biological efficiency, highest yield and shortest production cycle (6 days)
Gaitán- Hernández et al. ()
Characterize the production of lignocellulosic enzymes and bioconvert the wheat straw
Lechner and Papinutti ()
Banana leaves (Musa sapientum lina)
Efficient bioconversion with good yield
Belewu and Belewu ()
Mushroom cultivation has also been successfully done on various industrial wastes (Singhal et al. ; Kulshreshtha et al. ; Dulay et al.  and Kulshreshtha et al. [2013b]). Applications of mushroom as mycoremediation tool in the bioconversion of these industrial wastes into protein rich mushroom carpophores (fruiting bodies of mushroom), on one hand provides mushroom and on the other hand helps in solving pollution problems, which their disposal may otherwise cause.
Feasibility of the mycoremediation tool and processes
It is extremely important to carry out feasibility study before starting a remediation project in order to determine the best conditions for the process and toxicity in the fruiting bodies. The most important parameters to define a contaminated site are: biodegradability, contaminant distribution, chemical reactivity of the contaminants, soil type and properties, oxygen availability and occurrence of inhibitory substances (Martín et al. ). The success of mycoremediation is governed by three important factors- availability of mushroom, accessibility of contaminants and a conductive environment. Therefore, the knowledge on the physiology and ecology of the biological species or consortia involved and the characteristics of the polluted sites are decisive factors to select an adequate mycoremediation protocol (Martín et al. ).
Mycoremediation of waste from the environment by mushroom has many advantages but at the same time it is a challenge for the researchers and engineers. Mycoremediation of wastes can be done in in situ and ex situ conditions. When it is carried out on site, it eliminates the need to transport the toxic materials to treatment sites. It is an environmentally friendly approach and needs only a small space, low cost, less skilled persons and can be applied easily in the field. In contrast to above, there are some disadvantages in applying this mycoremediation tool. Mushrooms require time to adapt to the environment and cleanup wastes. Mushroom cultivated on industrial wastes may possess toxicity/genotoxicity. Genotoxicity of mushrooms is influenced by genotoxicants that are present in waste used for their cultivation. Therefore, it is necessary to assess toxicity/genotoxicity of mushrooms if used for bioremediation purpose.
Toxicity level in the fruiting bodies is based on two facts, i.e. biodegradation and biosorption. Mushroom possesses the suitable enzymatic machinery for biodegradation which lead to the degradation of pollutants from the substrate and convert it into less toxic products. This renders the fruiting bodies safe for consumption. Recently, many papers have published which reported that mushroom not only able to degrade pollutants but also able to reduce the toxicity or mutagenicity (Kulshreshtha et al. [2013b]; Choi et al. ; Malachová et al. ). Numerous studies stated that mutagenicity reduction by mushrooms is primarily species dependent. Kulshreshtha et al. () and Kulshreshtha et al. ([2013b]) reported Pleurotus florida was not found to have genotoxicity, however, Pleurotus citrinopileatus have had genotoxicity in their fruiting bodies when both were cultivated on industrial wastes and the mixture of wheat straw and industrial wastes under the same cultivation conditions.
Mutagenicity of naturally occurring and cultivated mushroom species detected by Ames test
Mutagenicity test results
Nine wild and two cultivated species of Spanish edible mushrooms
The mushrooms were mutagenic to TA100 and TA98 strains
Morales et al., ()
Wild and commercially grown mushrooms
Presence of microsomal enzymes (S-9) reduced the mutagenic effects of all the mushrooms, with the exception of Agaricus abruptibulbus and Cantharellus cibarius.
Gruter et al., ()
Direct-acting mutagenic response in various Salmonella typhimurium strains, TA104. Agaritine is not responsible for the mutagenicity of mushroom extracts
Papaparaskeva et al., ()
Agaritine was weakly mutagenic, in the absence of an activation system, in Salmonella typhimurium strain TA104.
Walton et al., ()
Pleurotus florida cultivated on handmade paper and cardboard industrial waste
Not mutagenic with either TA 98 or TA 100 strain
Kulshreshtha et al., ()
Pleurotus citrinopileatus cultivated on handmade paper and cardboard industrial waste
Mushroom extract is mutagenic with TA 98 strain
Kulshreshtha et al., [(2013)]
Biosorption can become a good tool to remediate toxic metals threatening the environment (Lamrood and Ralegankar ) but on the other hand, this process generates non-consumable biomass which gives rise to the new problem of disposing it. Usually researchers have been focused on the use of mushroom mycelium for biosorption and compare the abilities of biomass for sorption (Table 3). A very few publications reported the reason of varying power of biosorption to various types of mushroom (Kumhomkul and Panich-pat ; Das ). This fact may be a decisive factor for further use of mushroom species.
It is proved that mushrooms have different abilities of biosorption, bioremediation, biodegradation and toxicity reduction. In my opinion, researchers should try to first remediate the heavy metals by cultivating high metal absorbing species of mushroom. However, low absorbing edible species can be used to cultivate on waste so that absorption of the pollutants can be minimized. Researchers should also try to develop the method of using biomass repeatedly for the biosorption of pollutants which will also reduce the waste generation. The toxicity or genotoxicity of these mushroom species should be assessed and thereafter, non-toxic mushroom species can be used for consumption. However, in the case of remediation of pollutants preference should be given to those species which can degrade the pollutants. The safe species will be selected to remediate a particular type of waste and further use for consumption.
Mushroom is a tremendous boon to the idea of using this for mycoremediation process as a real-world solution. The cultivation of edible mushroom on agricultural and industrial wastes may thus be a value added process capable of converting these discharges, which are otherwise considered to be wastes, into foods and feeds. Besides producing nutritious mushroom, it reduces genotoxicity and toxicity of mushroom species. Mycoremediation through mushroom cultivation will alleviate two of the world’s major problems i.e. waste accumulation and production of proteinaceous food simultaneously. Thus, there is a need for further research towards the exploitation of potential of mushroom as bioremediation tool and its safety aspects for consumption as product.
We are thankful to Rajasthan Department of Science and Technology (DST), Jaipur for providing financial support for conducting work (Sanction No. 2005/3951-67). We are also thankful to University Grants commission (UGC) for their support and grant (F. No. 40-113/2011, SR). We are also thankful to DST (Delhi), and Center for International Co-operation in Science (CICS), Chennai for providing travel grant to present my research in an International conference “Bioproduct-2012”.
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