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The Role Of Plant Growth In Tropical Rainforests

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Commonalities across diverse plant-fungal symbiosis producing complex outcomes are evident in tropical rainforests. Host ranges and abiotic factors that determine the spatial structure and impacts of plant-fungal symbioses are key to understanding the ecological roles of symbionts that include mutualists, commensals and parasites. The large effects of even “asymptomatic” endophytes suggest that plant-fungal symbioses need to be considered in the full range of evolutionary ecology of tropical plants. These fungi play significant roles in the dynamics, diversity, structure and function of tropical forests (Gilbert and Strong 2007). (Gilber and Strong 2007). In terrestrial ecosystem, most plants obtain essential nutrients via mycelium network…show more content…
amazonia in the forest, even for seedlings inoculated with forest soil (Olfe and Aldrich-wolfe 2007). These studies found little evidence of host specificity and showed that ectomycorrhizal fungi (ECM) specificity occurs in culture and may occur in nature. Another speculation is that specialist occurs on particular plant species only under a given set of environmental conditions (Olfe and Aldrich-wolfe 2007).
Distribution and establishment of tree species composition in the forest is related to the soil properties (Davies et al. 2005) and belowground community, possibly attributed to host preferences of the different fungi (DeBellis et al. 2006; Ishida et al. 2007; Tedersoo et al. 2008; Diédhiou et al. 2010). Trees in species-rich tropical forests are mostly associated with AM fungi. Janos (1985) and Smits (1994), hypothesize that a specific specification exists between the ECM fungus and host in the tropics compared to the temperate areas. Dipterocarpaceae trees are believed to be host specific to ECM fungi (Stoll and Newberry 2005). The Dipterocarpaceae are an economically important tree family that often dominates the canopy of Southeast Asian rainforests. Dipterocarp species distributions are unrelated to soil texture or pH but are strongly related to soil nutrients. Most dipterocarp trees were significantly associated with soil nutrients, particularly P, Mg
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