Sorry, I couldn't resist. In most of the text books and literature promoting the wonders of mycorrhizal fungi, both Ecto (EM) & Endo (AM) Mycorrhizae generally are categorized into lists that highlight the main types of trees, shrubs and other plants which both of these differing fungi will supposedly ONLY colonize. The lists are almost a sort of etched in stone religious scriptural text that cannot be altered without facing some sort of backlash from the established Scientific Orthodoxy which establishes facts. Frankly, the Natural World couldn't care less what the research membership club may assume to be the prevailing consensus. Take for example the Chaparral Plant Community. The conventional thinking is that aside from Scrub Oak, Manzanita and a handful of other plants, most shrubs are Endomycorrhizal. Interestingly back in 2005, the US Forest Service published a report entitled:
"Greasewood or Chamise ( Adenostoma fasciculatum ) normally forms arbuscular mycorrhizae with all genera found in the region. However, during wet years (El Niño), we found EM associated with its roots and EM fungi in the stands (Allen and others 1999b). There was a high diversity of fungi ranging from Cenococcum and Balsamia spp. (ascomycetes ) to a variety of basidiomycetes such as Pisolithus sp., Cortinarius spp., and Hysterangium separabile. We also found a new species of Rhizopogon : R. mengei (Allen and others 1999a). This is an important finding , since all other known species of Rhizopog on are associated with conifers. In addition, we sequenced the dominant fungus found on the root tips of Chamise, and this fungus was an unknown species of ascomycete, most closely related to Sarcocypha emarginata (97 percent similarity in t h e sequence alignment of the 5.8S region, 63 percent similarity in I TS1, and 59 percent similarity in ITS2), a common fire-following fungus. There are clearly plant/ fungal symbiotic combinations that we do not understand and have yet to explore."
"Although we have focused on Coast Live Oak and Chamise, it must be noted that there are many other EM plants in southern California. These include all other species of oaks, all members of the Pinaceae, and Chinquapin ( Chrysolepus semper-virens ). In our region, these never have been surveyed comprehensively."
Maverick Example #1 - Chamise (Adenostoma fasciculatum) & Pisolithus/RhizopogonThe final quote in the very last sentence says it all, "In our region, these never have been surveyed comprehensively." No kidding ? The fact is, nothing is etched in stone when it comes to understanding Nature. If it was, our natural world wouldn't be in danger from global ruin as it is at present. The above admission and findings regarding ectomycorrhial colonization of many chaparral shrubs should takes us further in our understanding how to restore habitats and make practical application within the urban landscapes of Southern California. Why the very idea of Chamise or it's other not so flattering label Greasewood being ectomycorrhizal is almost unheard of. It's value to the natural world has been demonized by many insisting that it along is responsible for some of the worst wildfires in Southern California. Colonization by symbiotic various species of Ecto-Fungi, especially Pisolithus & Rhizopogon during wet rainy seasons is interesting and almost speaks volumes about the information encoded within the Chamise plant's DNA for facilitating tree establishment during these wetter periods like El Nino events. It almost has the appearance of a cooperative strategy within an entire ecosystem to mutualistically help the entire plant community advance itself towards woodland re-establishment. This clearly exposes the ignorance and arrogance of many powerful Forest Managers who have conveniently and deliberately (no doubt for financial gain) ignored the beneficial roles chaparral plants play in forest establishment and lifetime health of the forest. It is clear that during drier periods, such lack of symbiosis would prevent tree seedlings from unsuccessful establishment due to lack of moisture, even within the subsoil and also at the same time taxing the survival mechanisms of the Chamise itself, who although being a tough fighter in hot drier regions, also has it's own limits. BTW, I originally alluded to Chamise ability of helping to advance forest trees and other oak woodlands over a year ago in May of 2013 last year. It's one of the best at further Parry Pinyon growth. Given the new ectomycorrhizal connection revelations during extreme wet years, this along with it's incredible ability at hydraulic redistribution makes perfect explanatory sense for the successes in some areas regarding woodland increase.
Update October 2, 2015
Maverick Example #2 - Date Palm (Phoenix dactylifera) & Carob Tree (Ceratonia siliqua) - Pisolithus tinctorius
|image: University California of Riverside|
"In this study ectomycorrhizal plants frequency after inoculation by Pisolithus tinctorius in this study was 6.66% for Date Palm and 10% for Ceratonia Siliqua . Thus , Phoenix dactylifera and Ceratonia siliqua were ecto-mycorrhized for the first time in our experience conditions."Clearly, most western researchers, especially in the USA wouldn't have bothered such an investigation considering such plants are not considered a pressing economic concern as would the Arab world researchers, opting instead to believe the prevailing doctrine laced literature on the matter regarding Palms and other plants considered strictly to be endomycorrhizal. But this brings me to ponder about what other possible success stories are out there waiting to be discovered. For example, what about California Fan Palms (Washingtonia filifera) and other Palm Trees used in the urban landscape ? I don't doubt they are definitely endomycorrhizal, but is there a possibility they could also become ecto-mycorrhizal colonized under the right conditions and with the correct species of Ecto, which would allow them to interconnect with other plants in the wild within a wild Oasis setting or an urban landscape scenario in association with other trees and/or shrubs ?
Further references on Date Palms and Ectomycorrhization
From Laboratory of plants and microorganisms Biology, De partment of Biology, Faculty of Sciences, Universit y Mohamed I, Oujda Morocco
Maverick Example #3 - Alligator Juniper (Juniperus deppeana) & Pisolithus tinctorius
This Coulter Pine was a foot tall like the one in the above photo. It's location is in front of the one above where the Chaparral was cleared around it and a shed built which is in between both trees. However this was not done until 2004 almost 4 years after they were planted and they told me that they have never watered any of these trees. This seedling was actually slightly bigger than the one behind. Again, look at the height here which is much greater than the one above and notice the formation of cones already. This is unusual again given the drought circumstances which are presently hovering over this region and throughout California. What's exciting here as well is the formation of Coulter Pine cones already at this young stage. Clearly this less than one decade's worth of growth and survival can be attributed to the Chaparral which rather than compete, are aiding the tree's survival.
Once again this is the old Dawson homestead where we planted hundreds of Coulter & Jeffrey in 1983 which are now around between 20 and 30 feet high and bearing cones. We left the majority of Redshank, Chamise, Manzanita and Sugarbush. But clearly after inoculation with the PT Mycorrhizae, more happened than just hydraulic redistribution for mutual survival. I clearly have more picture examples of my old place and elsewhere, but the point has been made. Look forward to more research and discovery. In fact, biomimic it yourself and document what happens with photography. Share the results with others. BTW, for the landscapers, remember the importance of following establishment by replicating what happens during wetter years by watering with deep soaking frequently to first couple of years, then tapering off. Clearly this is also important in PT Mycorrhizal coolonization within the chaparral community which assures better tree seedling success.
Further reading of Interest:
University Mohamed Premier, Bd Med VI, Oujda Morocco:"Ectomycorrhization of Date Palm and Carob Plants"