Mycelial network-mediated rhizobial dispersal enhances legume nodulation

Abstract

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The generalizability of water‐deficit on bacterial community composition; Site‐specific water‐availability predicts the bacterial community associated with coast redwood roots

“…This trend of enrichment of Actinomycetales associated with roots has also been observed under drought conditions in the rhizosphere of rice, another wet-adapted plant species (Santos-Medellín et al, 2017). While there are many unicellular taxa within Actinomycetales, members of the group are largely recognized for their ability to form branching hyphae during parts of their life cycles (Barka et al, 2016;Goodfellow & Williams, 1983 bacteria have been previously demonstrated to require either saturated conditions or fungal hyphae ("fungal highways") in order to move towards resources (e.g., roots) within the soil profile (Quelas et al, 2016;Wolf et al, 2013;Zhang et al, 2020). In conjunction with the decline in Bradyrhizobium sp., we saw a relative increase in the second most abundant root OTU (OTU-2 Streptomyces sp.…”

“…Just as plants with different growth morphology such as trees, shrubs, or grasses might dominate different parts of environmental gradients, the broad‐scale growth morphology of microorganisms (e.g., unicellular or filamentous) may also play a role in these distribution of these taxa (Daws et al., 2020). For instance, unicellular, flagellate bacterial taxa require saturated soil conditions in order to swim towards and colonize pools of resources such as roots (Quelas et al., 2016; Zhang et al., 2020). Conversely, bacteria that grow filamentously are less likely to depend on soil saturation for motility and subsequent root colonization as they are able to grow towards resources (Wolf et al., 2013; Zhang et al., 2020).…”

“…For instance, unicellular, flagellate bacterial taxa require saturated soil conditions in order to swim towards and colonize pools of resources such as roots (Quelas et al., 2016; Zhang et al., 2020). Conversely, bacteria that grow filamentously are less likely to depend on soil saturation for motility and subsequent root colonization as they are able to grow towards resources (Wolf et al., 2013; Zhang et al., 2020). Both bacteria and fungi with these contrasting growth morphologies have been demonstrated to display different patterns of distribution in soil across environmental gradients, probably due to the expansion of resource availability (and thus realized niche space) conferred by filamentous morphology across habitat heterogeneity (Daws et al., 2020; Wolf et al., 2013).…”

“…For instance, unicellular, flagellate bacterial taxa require saturated soil conditions in order to swim towards and colonize pools of resources such as roots (Quelas et al, 2016;Zhang et al, 2020). Conversely, bacteria that grow filamentously are less likely to depend on soil saturation for motility and subsequent root colonization as they are able to grow towards resources (Wolf et al, 2013;Zhang et al, 2020).…”

Microbial Interactions Within Multiple-Strain Biological Control Agents Impact Soil-Borne Plant Disease

“…For example, fungal hyphae are capable of serving as vectors for the dispersion of bacteria in the rhizosphere, which is known as a “fungal highway” ( Kohlmeier et al, 2005 ; Warmink et al, 2011 ; Figure 1B ). In a recent study, Zhang et al (2020) showed that rhizobia use mycelia of Phomopsis liquidambaris as dispersal networks to migrate into legume rhizospheres and to trigger nodulation. Extraradical mycelium formed by the mycorrhiza fungus Glomus formosanum CNPAB020 can facilitate the translocation of Bradyrhizobium diazoefficiens USDA 110 in the rhizosphere ( de Novais et al, 2020 ) in addition to its main activity in nutrient transfer.…”