Some interesting facts
about Arbuscular Mycorrhizal Fungi, and further reading-
(this is still a bit of an information
dump, it still needs to be edited and footnoted, but take a look...)
Mycorrhizal fungi can
protect the roots from disease organisms, through simple spatial interference, by improving nutrient uptake, and by producing
glomulin and other metabolites that inhibit disease. Stress in plants can be reduced because the mycorrhizal fungi can solubilize
mineral nutrients from plant not-available forms to plant available forms, and translocate those nutrients to the root system
in exchange for sugars provided by the plant.
fungi played an integral role in the success of plants in the environment of early Earth as plants moved from water to
land, by providing efficient nutrient absorption from the low organic matter mineral soil, and assisting in the formation
of soil aggregates. Arbuscular mycorrhizal (AM) fungi occur over a wide range of agro climatic conditions and are geographically ubiquitous.
plants that associate with mycorrhizal fungi are corn, carrots, leek, potatoes, beans, soybeans, other legumes, tomatoes,
peppers, onions, garlic, sunflower, strawberries, citrus, apples, peaches, grapes, cotton, coffee, tea, cocoa, and sugarcane.
For some plant species, the association with mycorrhizal fungi is indispensable. The degree of dependence varies with plant
species, particularly the root morphology, and conditions of soil and climate. Plants with thick roots, poorly branched and
with few root hairs, are usually more dependent on mycorrhizae for normal growth and development.
fungi do not disperse with the wind like mold fungi, but instead move by growing from root to root, or by moving with quantities
of soil. Unless your site is within a few feet of healthy native vegetation, mycorrhizal fungi are very unlikely to show up
fast enough to benefit your plants in the critical early stages. There are confirmed cases of native plants that sat three
years (surviving only with artificial maintenance) before native mycorrhizal fungi moved to the site.
mycorrhizal fungi is the medium of soil structure, it determines the flow of water, nutrients, and air, directs the pathways
of root growth, and opens channels for the movement of soil animals. As the moderator of the microbial community, it determines
the metabolic processes of the soil. In other words, the mycorrhizal network is practically synonymous with ecosystem function.
The tremendous advances in research on mycorrhizal physiology
and ecology over the past 40 years have led to a greater understanding of the multiple
roles of AMF in the ecosystem.
mycorrhizal (AM) fungi are the most abundant type of fungi in the soil, and are one of the most dominate
and important organisms in the soil, comprising 5–50% of the total microbial biomass in soils.
Mycorrhizae tend to be the largest component in the ecosystem primarily
because both the fungi and the associated roots are turned over rapidly.
Mycorrhizal Fungi plays an important role in the structure and development of new soil and in the sequestration of carbon
in the soil
It was as recently as 1996 that a scientist from the US Department of
Agriculture discovered that a sticky protein called Glomalin produced by Arbuscular Mycorrhizal Fungi plays an important role
in the structure and development of new soil and in the sequestration of carbon in the soil. See article…
Glomalin: Hiding Place for a Third of the World’s Carbon http://www.ars.usda.gov/is/ar/archive/sep02/soil0902.htm
Glomalin -The hyphae of
Arbuscular Mycorrhizal fungi produce a substance glycoprotein called glomalin acts as a protective coating in fungal
hyphae to keep water and nutrients from being lost proior to reaching the plant host and to protect hyphae from decomposition
and microbial attach. It acts like a "PVC coating" on a cardboard tube (hyphae) giving them them eater-proof
and the rigidity they need to span the air spaces between soil particles.
of Soil Aggregates-Glomalin sloughs off into surrounding soil particles and contributes to the formation and stabilization
of soil aggregates. Soil aggregation is the formation of a conglomeration of sand, silt, clay, organic matter, such as plant
debris, and inorganic compounds like iron oxide. Glomalin provides a protective coating to aggregates to stop them from
breaking apart into smaller, erodible particles. Aggregates increase the soil"s stability against wind and water erosion,
maintain soil pores, which provide air and water infiltration rates favorable for plant growth, improve soil fertility by
holding nutrients in protected micro-sites near the plant roots, store carbon by protecting organic matter from decomposition,
and assist in nutrient cycling. It is a very tough molecule, and required an unusual effort to dislodge glomalin for
study, which was one of the reasons it eluded scientific detection for so long. From what they
can determine AM fungi are the only producers of Glomalin
As a plant grows, the fungi move down
the root and form new hyphae to colonize the growing roots. When hyphae higher up on the roots stop transporting nutrients,
their protective glomalin sloughs off into the soil. There the sticky substance attaches to particles of minerals (sand, silt,
and clay) and organic matter, forming clumps. This type of soil structure is stable enough to resist wind and water erosion,
but porous enough to let air, water, and roots move through it. It also harbors more beneficial microbes, holds more water,
and helps the soil surface resist crusting. It is Glomalin the gives soil its tilth.
Carbon Sequestration-Their studies
showed that glomalin accounts for 27 percent of the carbon in soil and is a major component of soil organic matter. The found
that glomalin weighs 2 to 24 times more than humic acid, a product of decaying plants that up to now was thought to be the
main contributor to soil carbon. But humic acid contributes only about 8 percent of the carbon. Another team recently used
carbon dating to estimate that glomalin lasts 7 to 42 years, depending on conditions. 
Sara Wright, the scientist that discovered glomalin, found
glomalin levels up to 15 mg/g elsewhere in the Mid-Atlantic region. But she found the highest levels—more than 100 mg/g—in
Hawaiian soils, with Japanese soils a close second. "We don't know why we found the highest levels in Hawaii's tropical
Hyphae – The mycorrhizal fungi hyphae are
much smaller than plant roots, so they can easily penetrate into small spaces between soil particles.
The thread-like hyphae, are structured such that there are linear cytoplasmic units that can extend for a meter
or more, fan out into the soil to scavenge even highly immobile nutrients, efficiently absorb the maximum amount of available
nutrients and deliver these nutrients back to the plant inside the root cell wall.
In studying differences in the architecture
and wall thickness of extraradical hyphae, two types or morphologies were recognized: the larger and thicker, more
mellanized hyphae which is part of the ‘permanent’ fungal network and acts as ‘conduit’ or runner
hyphae, and the thin-walled, very
ephemeral hyphae which is the ‘absorptive’ hyphae and will fan out into nutrient-rich microsites in the soil.
The ephemeral hyphae are decomposed in days or weeks while the turnover of runner hyphae may be years
Mutualistic Symbiosis-A mycorrhizae is a mutualistic symbiosis between plant and fungus localized
-In return, the mycorrhizal fungi receive sugars and other compounds from plants to fuel mycorrhizal
activities. Both agricultural plant and fungus benefit from the "symbiotic relationship. These fungi receive carbon
(about 12–27%) from the plant host in the form of simple hexose sugars, which are used for fungal growth and exuded
into the mycorrhizosphere
Increased mobilization and transfer of nutrients (P, N, S, micronutrients Cu, Zn) from the soil to the
plant. Mycorrhizal fungi have been estimated to “substitute” up to 500 lb/acre of Phosphorus for citrus and 170
lb/acre for soybeans in tropical areas. They secrete powerful extracellular
enzymes that dissolve tightly bound minerals like phosphorus, and iron. Their hair-like filaments function
as pipes to funnel more water and nutrients, particularly phosphorus, and other mineral nutrients, such Cu, and Zn, back to
the plant roots. Recent research by the Agricultural Research Service has documented the importance
of mycorrhizae for the uptake of nitrogen. They were shown to enhance root absorption area up to 47-fold
. Phosphorus-Better development of Phosphorus solubilizing
bacteria in the mycorhizosphere. Some crops that are poor at seeking out nutrients in the
soil are very dependent on AM fungi for phosphorus uptake. For example flax, which has poor chemotaxic ability, is highly dependent on AM mediated phosphorus uptake at low and intermediate
soil phosphorus concentrations (Thingstrup et al. 1998).
AM Interaction with other Organisms-AM
fungi influence bacterial, fungal, and microarthropod communities by providing them substrates in the forms of decomposing
fine, ephemeral hyphae and the deposition of hyphal biomolecules, and by influencing soil structure Mycorrhizal
fungi exude (photosynthetically-derived) carbon into the mycorrhizosphere which attract soil organisms, these microorganisms
(use these) exudates to transform organic matter and soil minerals into plant-available nutrients which also stabilize soil
of plant-pathogen relations: mycorrhizae influence the colonization of roots by other microorganisms, reduce the susceptibility
(or increase the tolerance) of roots to soil-borne pathogens such as nematodes or phytopathogenic fungi. Secretion of antibiotics and support of a community that competes or antagonizes pathogenic microorganisms, thus
aiding in disease suppression;
Plant growth hormones -AM
increased production of plant growth hormones such as cytokinins and gibberelins;
Water -Modification of soil-plant-water relations, promoting better adaptation of plant to adverse
environment conditions (drought, metals). At elevated heavy metal concentrations in soils, mycorrhizal fungi have been shown
to detoxify the environment for plant growth.
of nutrients characterizes these symbionts where carbon flows to the fungus and inorganic nutrients get transported through
mycorrhizal network to the plant
Plant species differ in the extent and dependence on colonization by certain
AM fungi and some plants may be facultative mycotrophswhile others may be obligate mycotrophs.
Host plant species differ in the degree
to which they depend on the symbiosis. That is, some (mostly weedy) species benefit little, even though they are capable of
becoming mycorrhizal.Other species are mycotrophic: they depend upon the symbiosis and make little growth
without it unless heavily fertilized. Perennial grasses are often strongly mycotrophic.
Other factors such as root surface area, root hair abundance and length, growth rate, response to
soil conditions and exudations can be related to the plant dependency on AM symbiosis for nutrient uptake.
Some crops are considered as facultative mycotrophs, while others are seen as obligate mycotrophs (Smith and Read, 1997).
Various plants, such as leek or corn, are highly dependent on mycorrhizae to meet their basic P requirements, while others
like wheat, barley and oat, benefit from the symbiosis but are less dependent (Plenchette, 1983; Ryan and Angus, 2003).Colonization Levels-Given that mycorrhizal fungi can influence so
many aspects of plant growth, and documenting all these benefits is usually extremely expensive and difficult, they have not
been documented. Therefore, probably the best that can be done is to say that perhaps as low as 12% colonization might be
documented to be beneficial (work by Moore and Reeves in the mid-1990’s), but more likely a minimum level of 40% colonization
is required, as suggested by Mosse, and St. John in various publications and comments.
If the plant does not require mycorrhizal colonization, there
probably is no reason to assess the roots for mycorrhizal colonization. Although the Allens showed that one way for certain
plants to exclude non-mycorrhizal plants from a community was to make sure the mycorrhizal fungi were present, because the
mycorrhizal fungi pulled nutrients from the non-mycorrhizal plants. This is a probable mechanism for mycorrhizal crop plants
being able to out compete weeds and earlier successional plant species.
When mycorrhizal colonization is low, or less than the desired range, given that the desired plant
requires VAM or ectomycorrhizal colonization or ericoid mycorrhizal fungi, then check how low the colonization is.
If less than perhaps 10 to 15%, then addition
of mycorrhizal spores would be a good idea. If it is an annual plant, placing VAM spores near or on the seed or seed pieces
is the simplest way to get the roots colonized as soon as the roots area produced.
With permanent turf, adding VAM spores into the compost mixed into the
aeration cores gets the VAM spores into the root system without destroying the turf.
With perennial plants, verti-mulching and adding the VAM or ecto-
spores into the compost mixed in the vertimulch is the simplest way to get the spores next to the root system. In cases where
we have added inoculum in this fashion, roots have gone from 0% colonization to 25 to 30% within a year, and to 50 to 60%
in two years, with addition of humic acids through the season to help the mycorrhizal fungi grow rapidly (see next section)
If colonization is between 15%
and 40%, then all that is needed is additional fungal foods to help the mycorrhizal fungi improve plant growth, reduce plant
stress, and improve root protection.
is a dose response relationship to humic acids additions. Typically addition of 2 to 4 pounds of dry product, or 1 to 2 gallons
of liquid product per acre are adequate to improve fungal growth. But, if there are toxic chemical residues to overcome, additional
humics of fulvics may be needed. It is best to check periodically to see that colonization is improving as desired.
Be aware that that most humic acid products
contain 10 to 12% humic acids. If the product you are considering is less expensive, please check the concentration of humic
acid. Half the concentration of the humic acid means they can drop the price, but your fungi get less benefit.
Check colonization periodically to make sure
the fungi are growing and colonization is increasing. Weather can cause problems with colonization, and severe drought, floods,
burns, compaction causing by over-grazing, heavy machinery, herds of people walking on the lawns or turf can reduce colonization.
If that happens, additional applications of fungal foods will be needed to help resuscitate the damage. Fungi are just like
any other organism. If they are harmed, they need care to recover. Triage for fungi includes adding foods they love (humic
acid is like chocolate to a choc-a-holic, but they’ll also accept any woody, wide C:N ratio fungal food), and putting
on a mulch or litter layer on the soil surface.
If colonization is above 40%, then the plants are getting the help they need from the fungi. Periodically check to
make sure nothing has harmed them.
if colonization seems too high? This is extremely rare, but does happen, and seems to be associated with the fungi taking
more than their fair share of the plant’s resources. Stop applying fungal foods. Consider helping the bacteria compete
with the fungi for a bit.
Corn/Maize- Maize is an obligate mycotroph, which means it is heavily dependent upon the symbiosis with AM and makes little growth without it unless heavily fertilized. Maize
is also a trap plant with ability to attract mycorrhizal propagules even when present
in low amounts, a likely event in the tropical soils. A 90 day fallow in corn can reduce AM active hyphae by 57%.
Weeds -Most weeds are
not AM, so this might mean that inoculated with AM would favor AM plants over weeds. Soil with little
inoculum selects against most natives and favors the plant species that do not need to become mycorrhizal
early in life. These plants are better known as weeds.
Soil pH-Most of the mycorrhizal isolates were able to germinate
at pH 3.8,Mycorrhizae lower the rhizosphere pH due to selective uptake of NH4+ (ammonium-ions) and release of H+ ions. Decreased soil pH increases the solubility of phosphorus precipitates. The hyphal
uptake of NH4+ also increases the flow of nitrogen to the plant as NH4+ is adsorbed to the soil's inner surfaces and must be taken up by diffusion.
Interaction with nitrogen fixing bacteria -
Nodulating - legumes require an optimum level of phosphorus in
their tissue for nodulation and nitrogen fixation by the bacterial symbiont, because these processes are phosphorus dependent.
Arbuscular mycorrhizal fungi provide aid to these processes with the bacterial symbionts by satisfying
the host nutritional needs. Recent research has shown that AM fungi release an unidentified diffusional
factor, known as the myc factor, which activates the nodulation factor's inducible gene mtENOD11. This is the same gene involved in establishing symbiosis with the nitrogen fixing, rhizobial bacteria(Kosuta et al. 2003).
When rhizobium bacteria are present in the
soil, mycorrhizal colonization is increased due to an increase in the concentration of chemical signals involved in the establishment
of symbiosis (Xie et al. 2003).
is a lower incidence of mycorrhizal colonization in very arid or nutrient rich soils. When
the level of soil fertility and humidity are increased, the dependence on the mycorrhizal condition decreases to a point where
the plant becomes immune to colonization. The
addition of fertilizers containing easily soluble phosphorus, including non-composted manure, will greatly reduce VAM colonization.
An important consideration in AM fungus production is the level of available Phosphorus
in the media in which the plant hosts are grown. Plants growing in high P situations limit colonization of their roots by
AM fungi. In effect, they are deciding to limit the “cost” (in terms of sugar) of the symbiosis in the absence
of benefit (in this case, improved uptake of phosphorus) since the roots can function well enough on their own in the high
nutrient situation. A 90 day fallow in corn can reduce AM active hyphae by 57%, root colonization
by crops which are not AM can reduce AM colonization by 37%. Plants which are not
mycorrhizal Those include members of the Brassicaceae family, like cabbage and cauliflower, and the mustard
family, like canola and crambe. "When you grow those crops, it's like a fallow period, because glomalin production
stops," says Wright. "You need to rotate them with crops that have glomalin-producing fungi."
Increasing Factors-Levels were maintained or raised by no-till, cover crops, reduced phosphorus
inputs, and the sparing use of crops that don't have arbuscular mycorrhizal fungi on their roots. Seedlings
become mycorrhizal very quickly if the soil is full of mycorrhizal hyphae, but more slowly if the soil contains only dormant
spores (fungal reproductive structures). The living mycelial network favors
the diverse native species that must become mycorrhizal quickly. Seedlings
that germinate on soil with an existing mycorrhizal network can very quickly become mycorrhizal. Seedlings that germinate
on soil without a mycorrhizal network become colonized much more slowly.
Within the last decade, inventories of the soil’s productive capacity indicate
severe degradation and loss of arable lands as a result of soil erosion, cultivation, salinization, over-grazing, land clearing,
desertification, soil pollution, and atmospheric pollution. Loss of topsoil, at a rate of 10 million hectares per year,
is a serious problem in agroecosystems and has resulted in an estimated loss of nearly one-third of the world’s arable
land during the last 40 years (Pimentel et al., 1995)
found that switchgrass fields had an average of about seven tons more soil carbon per acre than nearby corn and wheat fields.
Greater soil carbon under switchgrass was observed at all depths, but it was most pronounced at one to three feet down—a
depth in the soil profile where switchgrass has more root biomass than corn or wheat. Switchgrass roots grow as long as eight
feet, compared to three to six feet for corn and wheat.
International Culture Collection of (Vascular) Arbuscular Mycorrhizal Fungi (INVAM)
has excellent information on propagating mycorrhizal spores-
A hard-to-understand, and even harder to override, characteristic of AM fungi limits the ways in
which inoculum may be produced. Arbuscular mycorrhizal fungi are obligate symbionts, that is they must colonize plant roots
to grow and reproduce.
Endomycorrhizal fungi have to be multiplied
through a host plant. For this reason, widespread inoculations are difficult and better field success is obtained through
management of the symbiosis (i.e., nutrient conditions of the soil/substrate of plant growth).
the phase of the fungus inside the root (“intraradical hyphae”) can absorb sugar and express certain metabolic
pathways necessary for growth, such as the synthesis of fats. Therefore, the fungus has a very limited ability to grow asymbiotically,
i.e. without living in symbiosis. Failure by researchers to overcome these limitations has prohibited the growth of these
organisms in pure culture on Petri dishes or in fermenters for inoculum production.
It is a myth that arbuscular fungi behave similar to many other fungi by initiating
sporulation after nutrient deprivation (host stress in obligate symbionts). Timing of onset of sporulation varies with species
and also growing conditions (affecting fungus directly and indirectly through host physiology). It often occurs within 3-4
weeks after onset of mycorrhizal colonization under almost any conditions except high phosphorus in soil (which inhibits all
phases). We, and researchers in Lyn Abbott's lab, have experimental results indicating sporulation occurs only after a critical
threshold level of fungal biomass is established in roots. Sporulation then progresses asynchronously thereafter along with
continued mycorrhizal development.
Arbuscular fungi are obligate biotrophs that are unable to sustain growth
and reproduction apart from a plant host. This restrictive niche appears to be balanced by an extremely wide host range, so
that ample opportunities exist for any dispersed fungal propagule to establish a new individual somewhere else. [ ]
The filamentous habit characteristic of this and other fungi affords organisms considerable versatility
in their life cycles, with the capability of indefinite growth as long as carbon from a host plant source is available.
Intraradical hyphae originated from a single entry point appear to have limited growth,
forming an "infection (or colonization) unit" of a size regulated by host-fungus interactions.
The external hyphae are of various morphologies and functions, ranging from "infective" hyphae to "absorptive"
hyphae to "fertile" (spore-bearing) hyphae. Duration of growth, senescence, etc. and other properties of each hyphal
form is poorly understood at this time.
It is the infective hyphae which initiate new points
of colonization on the same root, other roots of the same plant, or roots of adjacent plants.
Work with pot cultures indicates external hyphae (fragments
or attached to mycorrhizal roots) are most infective in the families Glomaceae and Acaulosporaceae.
Topsoil should be collected during a dormant
season: the dry part of the year in warm climates, or the cold part of the year if there is no distinct dry season. For very small jobs, you can collect topsoil from the root zone of a known mycorrhizal
host. For AM inoculum, try a late-successional native shrub or tree, or a perennial grass. Mycorrhizal propagules settle out quickly in water and must be continuously agitated to remain in suspension. Inoculum
suspensions have been recommended for application through drip irrigation systems with hundreds of yards of pipe and tubing.
AM inoculum is singularly unsuited for such use
of mycorrhizae-Arbuscular mycorrhizal (AM) fungi are ancient microorganisms appeared between 460 and 400 million
years ago as plants started to colonize the land. Mycorrhizal fungi are ancient microorganisms which played an integral role
in the success of plants in the environment of early Earth as plants moved from water to land, by providing efficient nutrient
absorption from the low organic matter mineral soil, and assisting in the formation of soil aggregates.
For a more in-depth history of the evolution of AM check out - pages 179-181 -
also for evolution of AM- http://mycorrhizas.info/evol.html#intro
The word mycorrhizae was first used by German researcher A.B.
Frank in 1885, and originates from the Greek mycos, meaning 'fungus' and rhiza, meaning 'root'.Correct Terminology –
In the last 10 years, some
researchers have suggested that some mycorrhizal fungi do not produce vesicules under all conditions, and so VA mycorrhizal
fungi should be called arbuscular mycorrhizal fungi, not vesicular-arbuscular mycorrhizal fungi. Just be aware that sometimes,
people say VAM, sometimes AM.
See -The Instant Expert Guide to Mycorrhiza
by Ted St. John
Do not speak of a mycorrhizae plant. The adjectival form is mycorrhizal. Speak of a mycorrhizalplant.
The mycorrhiza is not the fungus - the mycorrhiza
is the symbiotic combination of plant and fungus, the term mycorrhiza refers to a combined structure. This subtlety is elusive
enough that even specialists have lapses from time to time, and say mycorrhiza when they really mean the fungus. Even if you
occasionally slip, be sure you grasp the central idea that a mycorrhiza is the combination, which includes the mycorrhizal
fungus and the mycorrhizal host plant.
The term Infected vs. Colonization:
Until the 1970s, mycorrhizal plants were said to be infected by mycorrhizal fungi. Since infection sounded too pathological,
we began saying colonization instead. Today, hard looks will befall those who speak of mycorrhizal infection.
AM or VAM??? AM fungal species form arbuscules (branched structures inside
the root cells) at some point in the colonization cycle, but not all form vesicles (oil storage organs in the roots). Thus,
the current trend to drop the V part of VAM. Among mycorrhizal specialists, those who still say VAM are thought to be badly
out of date, and there has been a stampede to the more current term. Say VAM at your peril.
Mycorrhizae: Sustainable Agriculture and Forestry
Free download - hMttp://www.krishibid.com/ebook/Mycorrhizae%20-%20Sustainable%20Agriculture%20and%20Forestry%20(Springer,%202008).pdf
1. Mycorrhizae: An Overview
Zaki A. Siddiqui and John Pichtel
2. The Molecular Components of Nutrient Exchange in Arbuscular Mycorrhizal Interactions
Ruairidh J.H. Sawers, Shu-Yi Yang, Caroline Gutjahr, and Uta Paszkowski
3. Arbuscular Mycorrhizal Fungi as Potential Bioprotectantsagainst Plant Pathogens
Mohd. Sayeed Akhtar and Zaki A. Siddiqui
Arbuscular Mycorrhizae and Alleviation of Soil Stresses on Plant Growth
Giasson, Antoine Karam, and Alfred Jaouich
5. Arbuscular Mycorrhizal Fungi Communities in Major
Intensive North American Grain ProductionsM.S.
Beauregard, C. Hamel, and M. St.-Arnaud
6. Arbuscular Mycorrhizae: A Dynamic MicrosymbiontRestoration in Native Ecosystems for Sustainable Agriculture
Jitendra Panwar, R.S. Yadav, B.K. Yadav, and J.C. Tarafdar
7. Indirect Contributions of AM Fungi and Soil Aggregation to Plant Growth
Kristine A. Nichols
8. Arbuscular Mycorrhizae and their Role in Plant Restoration in Native Ecosystems
Krish Jayachandran and Jack Fisher
9. Effects of Interactions of Arbuscular Mycorrhizal Fungi and Beneficial Saprophytic Mycoflora
on Plant Growth and Disease ProtectionFungi
and Beneficial Saprophytic Mycoflora on Plant
Saldajeno, W.A. Chandanie, M. Kubota and M. Hyakumachi
The Mycorrhizosphere Effect: A Multitrophic Interaction Complex Improves Mycorrhizal Symbiosis and Plant Growth
R. Duponnois, A. Galiana, and Y. Prin
11. Ectomycorrhizae and their Importance in Forest Ecosystems
Kazuyoshi Futai, Takeshi Taniguchi, and Ryota Kataoka
12. Ectomycorrhizal Associations Function to Maintain
Krista L. McGuire
The Use of Mycorrhizal Biotechnology in Restoration of Disturbed Ecosystem
14. In vitro Mycorrhization of Micropropagated Plants: Studies on Castanea sativa Mill
15. Effective and Flexible Methods for Visualizing
and Quantifying Endorhizal Fungi
Susan G.W. Kaminskyj