Characteristics of archaea and bacteria in rice rhizosphere along a mercury gradient

Copyright © 2018 Elsevier B.V. All rights reserved..

Several strains of archaea have the ability to methylate or resist mercury (Hg), and the paddy field is regarded to be conducive to Hg methylation. However, our knowledge of Hg-methylating or Hg-resistant archaea in paddy soils is very limited so far. Therefore, the distribution of archaea and bacteria in the rhizosphere (RS) and bulk soil (BS) of the rice growing in Xiushan Hg-mining area of southwest China was investigated. Bacterial and archaeal 16S rRNA gene amplicon sequencing of the rice rhizosphere along the Hg gradient was conducted. THg concentrations in RS were significantly higher than that in BS at site S1 and S2, while MeHg concentrations in RS was always higher than that in BS, except S6. Bacterial species richness estimates were much higher than that in archaea. The bacterial α-diversity in high-Hg sites was significant higher than that in low-Hg sites based on ACE and Shannon indices. At the genus level, Thiobacillus, Xanthomonas, Defluviicoccus and Candidatus Nitrosoarchaeum were significantly more abundant in the rhizosphere of high-Hg sites, which meant that strains in these genera might play important roles in response to Hg stress. Hg-methylating archaea in the paddy field could potentially be affiliated to strains in Methanosarcina, but further evidence need to be found. The results provide reference to understand archaeal rhizosphere community along an Hg gradient paddy soils.

Medienart:

E-Artikel

Erscheinungsjahr:

2019

Erschienen:

2019

Enthalten in:

Zur Gesamtaufnahme - volume:650

Enthalten in:

The Science of the total environment - 650(2019), Pt 1 vom: 10. Feb., Seite 1640-1651

Sprache:

Englisch

Beteiligte Personen:

Ma, Ming [VerfasserIn]
Du, Hongxia [VerfasserIn]
Sun, Tao [VerfasserIn]
An, Siwei [VerfasserIn]
Yang, Guang [VerfasserIn]
Wang, Dingyong [VerfasserIn]

Links:

Volltext

Themen:

Archaea
Bacteria
Bulk soil
Comparative Study
FXS1BY2PGL
Journal Article
Mercury
Mercury methylation
Methylmercury Compounds
RNA, Ribosomal, 16S
Rhizosphere
Rice paddies
Soil
Soil Pollutants

Anmerkungen:

Date Completed 07.05.2019

Date Revised 07.05.2019

published: Print-Electronic

Citation Status MEDLINE

doi:

10.1016/j.scitotenv.2018.07.175

funding:

Förderinstitution / Projekttitel:

PPN (Katalog-ID):

NLM286940574