NDLI: Diversity and distribution of autotrophic microbial community along environmental gradients in grassland soils on the Tibetan Plateau

Content Provider	Springer Nature Link
Author	Guo, Guangxia Kong, Weidong Liu, Jinbo Zhao, Jingxue Du, Haodong Zhang, Xianzhou Xia, Pinhua
Copyright Year	2015
Abstract	Soil microbial autotrophs play a significant role in CO2 fixation in terrestrial ecosystem, particularly in vegetation-constrained ecosystems with environmental stresses, such as the Tibetan Plateau characterized by low temperature and high UV. However, soil microbial autotrophic communities and their driving factors remain less appreciated. We investigated the structure and shift of microbial autotrophic communities and their driving factors along an elevation gradient (4400–5100 m above sea level) in alpine grassland soils on the Tibetan Plateau. The autotrophic microbial communities were characterized by quantitative PCR, terminal restriction fragment length polymorphism (T-RFLP), and cloning/sequencing of cbbL genes, encoding the large subunit for the CO2 fixation protein ribulose-1,5-bisphosphate carboxylase/oxygenase (RubisCO). High cbbL gene abundance and high RubisCO enzyme activity were observed and both significantly increased with increasing elevations. Path analysis identified that soil RubisCO enzyme causally originated from microbial autotrophs, and its activity was indirectly driven by soil water content, temperature, and NH4 + content. Soil autotrophic microbial community structure dramatically shifted along the elevation and was jointly driven by soil temperature, water content, nutrients, and plant types. The autotrophic microbial communities were dominated by bacterial autotrophs, which were affiliated with Rhizobiales, Burkholderiales, and Actinomycetales. These autotrophs have been well documented to degrade organic matters; thus, metabolic versatility could be a key strategy for microbial autotrophs to survive in the harsh environments. Our results demonstrated high abundance of microbial autotrophs and high CO2 fixation potential in alpine grassland soils and provided a novel model to identify dominant drivers of soil microbial communities and their ecological functions.
Starting Page	8765
Ending Page	8776
Page Count	12
File Format	PDF
ISSN	01757598
Journal	Applied Microbiology and Biotechnology
Volume Number	99
Issue Number	20
e-ISSN	14320614
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-06-18
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	RubisCO CO2 fixation Tibetan Plateau Grassland Elevation Microbiology Microbial Genetics and Genomics Biotechnology
Content Type	Text
Resource Type	Article
Subject	Medicine Applied Microbiology and Biotechnology Biotechnology

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