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Variation in resource competition traits among Microcystis strains is affected by their microbiomes

mLife 2023年第4期2卷 401-415页

作者： Dylan Baker Casey M.Godwin muhtamim khanam Ashley M.Burtner Gregory J.Dick Vincent J.Denef Department of Ecology and Evolutionary Biology University of MichiganAnn ArborMichiganUSA Cooperative Institute for Great Lakes Research School for Environment and SustainabilityUniversity of MichiganAnn ArborMichiganUSA Department of Earth and Environmental Sciences University of MichiganAnn ArborMichiganUSA

Freshwater harmful algal blooms are often dominated by Microcystis,a phylogenetically cohesive group of cyanobacteria marked by extensive genetic and physiological *** have previously shown that this genetic diversity and the presence of a microbiome of heterotrophic bacteria influences competitive interactions with eukaryotic *** this study,we sought to explain these observations by characterizing Monod equation parameters for resource usage(maximum growth rateμmax,half-saturation value for growth Ks,and quota)as a function of N and P levels for four strains(NIES-843,PCC 9701,PCC 7806[WT],and PCC 7806ΔmcyB)in presence and absence of a microbiome derived from Microcystis isolated from Lake *** indicated limited differences in maximum growth rates but more pronounced differences in half-saturation values among Microcystis *** largest impact of the microbiome was reducing the minimal nitrogen concentration sustaining growth and reducing half saturation values,with variable results depending on the Microcystis *** strains also differed from each other in their N and P quotas and the extent to which microbiome presence affected *** data highlight the importance of the microbiome in altering Microcystis-intrinsic traits,strain competitive hierarchies,and thus bloom *** quota,μmax,and Ks are commonly used in models for harmful algal blooms,our data suggest that model improvement may be possible by incorporating genotype dependencies of resource-use parameters.

关键词： cultivation-dependent fitness harmful algal blooms host-microbe interactions phytoplankton

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