Stoichiometry-and-homeostasis-of-terrestrial-fungi-obtained-near-Irvine-California

Apr 30th, 2015
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The carbon, nitrogen, and phosphorus (C:N:P) ratios of 43 terrestrial fungal isolates acquired near Irvine, California, were analyzed and compared to the Redfield ratio (106:16:1) and global soil microbial biomass (60:7:1). To evaluate level of homeostasis or plasticity (non-homeostasis), three of the isolates (Davidiella, Mucor flavus, Helotiales) were grown in malt-yeast extract treatments with modified nutrient ratios.

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Stoichiometry and homeostasis of terrestrial fungi obtained near Irvine, CaliforniaNick Kelleywith Allison MorenoDrs. Adam Martiny and Anthony AmendAbstractThe carbon, nitrogen, and phosphorus (C:N:P) ratios of 43 terrestrial fungal isolates acquired near Irvine, California, were analyzed and compared to the Redfield ratio (106:16:1) and global soil microbial biomass (60:7:1). To evaluate level of homeostasis or plasticity (non-homeostasis), three of the isolates (Davidiella, Mucor flavus, Helotiales) were grown in malt-yeast extract treatments with modified nutrient ratios. Carbon and nitrogen levels were measured using combustion analysis. Soluble organic phosphorus was extracted using heated HCL and analyzed with a molybdenum reagent indicator and spectrophotometer. The average C:N:P of the 42 fungal strains was 153:31:1. The three isolates grown in nutrient-modified media exhibited weak homeostasis with respect to C:N, weak plasticity with respect to N:P, and strong plasticity with respect to C:P. These results suggest that the local terrestrial fungi around Irvine are controlled by environmental conditions, and their growth is both nitrogen- and phosphorus-limited.IntroductionThe Redfield ratio has become canonical in the study of marine biogeochemistry. Alfred Redfield found that marine primary producers were composed most notably of three elements: carbon (C), nitrogen (N), and phosphorus (P); and that these elements formed common atomic

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