Gallionellaceae in rice root plaque: metabolic roles in iron oxidation, nutrient cycling, and plant interactions.

Autor:	Chan CS; Department of Earth Sciences, University of Delaware, Newark, Delaware, USA.; School of Marine Science and Policy, University of Delaware, Newark, Delaware, USA.; Microbiology Graduate Program, University of Delaware, Newark, Delaware, USA.; Delaware Biotechnology Institute, Newark, Delaware, USA., Dykes GE; Microbiology Graduate Program, University of Delaware, Newark, Delaware, USA.; Delaware Biotechnology Institute, Newark, Delaware, USA.; Department of Plant and Soil Sciences, University of Delaware, Newark, Delaware, USA., Hoover RL; Department of Earth Sciences, University of Delaware, Newark, Delaware, USA.; Microbiology Graduate Program, University of Delaware, Newark, Delaware, USA.; Delaware Biotechnology Institute, Newark, Delaware, USA., Limmer MA; Department of Plant and Soil Sciences, University of Delaware, Newark, Delaware, USA., Seyfferth AL; Department of Earth Sciences, University of Delaware, Newark, Delaware, USA.; Department of Plant and Soil Sciences, University of Delaware, Newark, Delaware, USA.
Jazyk:	angličtina
Zdroj:	Applied and environmental microbiology [Appl Environ Microbiol] 2023 Dec 21; Vol. 89 (12), pp. e0057023. Date of Electronic Publication: 2023 Nov 27.
DOI:	10.1128/aem.00570-23
Abstrakt:	Importance: In waterlogged soils, iron plaque forms a reactive barrier between the root and soil, collecting phosphate and metals such as arsenic and cadmium. It is well established that iron-reducing bacteria solubilize iron, releasing these associated elements. In contrast, microbial roles in plaque formation have not been clear. Here, we show that there is a substantial population of iron oxidizers in plaque, and furthermore, that these organisms ( Sideroxydans and Gallionella ) are distinguished by genes for plant colonization and nutrient fixation. Our results suggest that iron-oxidizing and iron-reducing bacteria form and remodel iron plaque, making it a dynamic system that represents both a temporary sink for elements (P, As, Cd, C, etc.) as well as a source. In contrast to abiotic iron oxidation, microbial iron oxidation results in coupled Fe-C-N cycling, as well as microbe-microbe and microbe-plant ecological interactions that need to be considered in soil biogeochemistry, ecosystem dynamics, and crop management. Competing Interests: The authors declare no conflict of interest.
Databáze:	MEDLINE
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