Low Frankia inoculation potentials in primary successional sites at Mount St. Helens, Washington, USA

Seeds, Joshua D.; Bishop, John G.

doi:10.1007/s11104-009-9930-3

Cited by 17 publications

(14 citation statements)

References 45 publications

(55 reference statements)

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“…While the plant with the greatest number of positive associations, G. rossii , was indeed the most abundant plant species, K. myosuroides and C. nardina had the second highest number of positive associations even though they are only sparsely distributed across this subnival landscape. Interestingly, while G. rossii is dominant in moist meadow tundra at Niwot Ridge (Bowman et al, 2004), K. myosuroides and Carex species are dominant in dry meadow tundra ecotypes (Fisk and Schmidt, 1995; Seastedt and Vaccaro, 2001). Dominance is not the only important factor here, however, as the co-dominant with G. rossii , D. caespitosa , did not have a large number of associated bacteria.…”

Section: Discussionmentioning

confidence: 99%

Co-Occurrence Patterns of Plants and Soil Bacteria in the High-Alpine Subnival Zone Track Environmental Harshness

King¹,

Farrer²,

Suding³

et al. 2012

Front. Microbio.

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Plants and soil microorganisms interact to play a central role in ecosystem functioning. To determine the potential importance of biotic interactions in shaping the distributions of these organisms in a high-alpine subnival landscape, we examine co-occurrence patterns between plant species and bulk soil bacteria abundances. In this context, a co-occurrence relationship reflects a combination of several assembly processes: that both parties can disperse to the site, that they can survive the abiotic environmental conditions, and that interactions between the biota either facilitate survival or allow for coexistence. Across the entire landscape, 31% of the bacterial sequences in this dataset were significantly correlated to the abundance distribution of one or more plant species. These sequences fell into 14 clades, 6 of which are related to bacteria that are known to form symbioses with plants in other systems. Abundant plant species were more likely to have significant as well as stronger correlations with bacteria and these patterns were more prevalent in lower altitude sites. Conversely, correlations between plant species abundances and bacterial relative abundances were less frequent in sites near the snowline. Thus, plant-bacteria associations became more common as environmental conditions became less harsh and plants became more abundant. This pattern in co-occurrence strength and frequency across the subnival landscape suggests that plant-bacteria interactions are important for the success of life, both below- and above-ground, in an extreme environment.

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Section: Discussionmentioning

confidence: 99%

Co-Occurrence Patterns of Plants and Soil Bacteria in the High-Alpine Subnival Zone Track Environmental Harshness

King¹,

Farrer²,

Suding³

et al. 2012

Front. Microbio.

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“…In the mammalian gut, Bifidobacterium species aid in digestion of complex carbohydrates, including plant-derived oligosaccharides and gastric mucin (94, 105). The most clearly defined nutritional association between plants and Actinobacteria is the association between nitrogen-fixing Frankia strains and actinorhizal plants (Figure 2 c ) (30), which enables plants to colonize early during primary succession (78, 118, 141). …”

Section: Ecology Of Actinobacteriamentioning

confidence: 99%

Evolution and Ecology ofActinobacteriaand Their Bioenergy Applications

Lewin

Carlos

Chevrette

et al. 2016

Annu. Rev. Microbiol.

281

172

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The ancient phylum Actinobacteria is composed of phylogenetically and physiologically diverse bacteria that help Earth’s ecosystems function. As free-living organisms and symbionts of herbivorous animals, Actinobacteria contribute to the global carbon cycle through the breakdown of plant biomass. In addition, they mediate community dynamics as producers of small molecules with diverse biological activities. Together, the evolution of high cellulolytic ability and diverse chemistry, shaped by their ecological roles in nature, make Actinobacteria a promising group for the bioenergy industry. Specifically, their enzymes can contribute to industrial-scale breakdown of cellulosic plant biomass into simple sugars that can then be converted into biofuels. Furthermore, harnessing their ability to biosynthesize a range of small molecules has potential for the production of specialty biofuels.

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“…It is rather common that soils near actinorhizal hosts have greater nodulation capacity than surrounding soils (Zimpfer et al 1999;Jeong and Myrold 2001), including soils in primary successional volcanic sites (Seeds and Bishop 2009), although Frankia also occurs in sites lacking hosts (Zitzer et al 1996;Gtari et al 2007), and may be abundant in the rhizosphere of some non-actinorhizal plants like Betula (Smolander 1990), Rubus (Markham and Chanway 1996), or Alphitonia (Gauthier et al 2000). But, what factors would support a higher abundance of Frankia NU in Northwest Patagonian mallín soils, including those devoid of host plants, than in neighbour steppe?…”

Section: Discussionmentioning

confidence: 99%

Are Northwestern Patagonian “mallín” wetland meadows reservoirs of Ochetophila trinervis infective Frankia?

2010

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Mallín" (plural mallines) is a particular kind of wetland occurring in Patagonian steppe and forests. In Northwest Patagonia, mallines are humid meadows with high net primary production. It was previously found that a mallín soil in the steppe devoid of actinorhizal plants had a higher Frankia nodulation capacity in Ochetophila trinervis (sin. Discaria trinervis) than other soils in the region. Under the hypothesis that mallín wetland meadows are reservoir of infective Frankia, we studied the Frankia nodulation capacity in O. trinervis of 12 mallín and their neighbouring steppe soils, by using plant bioassays. A qualitative plant bioassay showed that infective Frankia was present in most soils. The number of nodules per plant in seedlings inoculated with mallín soils was negatively correlated with soil water content while the opposite was true for plants inoculated with soils from neighbouring steppe. A quantitative bioassay was performed with eight representative soils, selected according to the number of nodules per plant produced in the qualitative assay and to the presence or not of different actinorhizal plants at the sites. Frankia nodulation units per cm 3 of soil (NU) in mallín soils were higher than those in steppe. Water and organic matter content of soils were correlated with the higher nodulation capacity of mallines, which may account for the saprotrophic growth of Frankia in soils. The symbiosis was effective in plants inoculated with all soil samples. These results suggest that Northwestern Patagonian mallín wetland meadows are reservoirs of infective and effective Frankia propagules in O. trinervis.

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Low Frankia inoculation potentials in primary successional sites at Mount St. Helens, Washington, USA

Cited by 17 publications

References 45 publications

Co-Occurrence Patterns of Plants and Soil Bacteria in the High-Alpine Subnival Zone Track Environmental Harshness

Co-Occurrence Patterns of Plants and Soil Bacteria in the High-Alpine Subnival Zone Track Environmental Harshness

Evolution and Ecology ofActinobacteriaand Their Bioenergy Applications

Are Northwestern Patagonian “mallín” wetland meadows reservoirs of Ochetophila trinervis infective Frankia?

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