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Host-specific and tissue-dependent orchestration of microbiome community structure in traditional rice paddy ecosystems

Journal Article · · Plant and Soil
Abstract Background and aim

Rice and duckweed are two monocotyledonous plants that naturally coexist in paddy fields. While the presence of duckweed in paddy fields significantly improves rice productivity, the interplay between soil microbes and the two plant hosts in this agroecosystem remains unexplored.

Methods

We compared the bacterial community structure between duckweed, rice and soil from multiple rice paddies. We also isolated bacteria from these communities and characterized their modes of bacterial colonization and plant growth-promotion using model plants.

Results

Our data indicate that host-specific and tissue-dependent factors reproducibly orchestrate the bacterial community structure associated with their plant hosts. This is corroborated by results from culture-dependent approaches in which the dominant genusPantoeaisolated from rice aerial tissues can strongly attach and colonize gnotobiotic duckweed in spite of the low representation of this bacterial genus in the natural duckweed microbiome. Our study identified a core of 254 bacterial taxa that are consistently found in all rice and duckweed tissue samples from rice paddy fields. Furthermore, characterizing auxin-producing bacteria isolates from both plant species identified potential plant growth-promoting bacteria that may improve growth for both duckweed and rice in paddy fields.

Conclusions

Results from this work provide evidence for the importance of the host tissue and species context in determining plant colonization by microbes in the paddy field system. The resources generated in this study could facilitate the agronomic deployment of microbes for more sustainable rice production.

Research Organization:
Cold Spring Harbor Laboratory Cold Spring Harbor, NY (United States); Univ. of California, Oakland, CA (United States); Battelle Memorial Institute, Columbus, OH (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
DOE Contract Number:
SC0018244; AC02-05CH11231; AC05-76RL01830
OSTI ID:
1803329
Journal Information:
Plant and Soil, Journal Name: Plant and Soil Journal Issue: 1-2 Vol. 452; ISSN 0032-079X
Publisher:
Springer
Country of Publication:
United States
Language:
English

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  • Ng, C. A.; Wong, L. Y.; Lo, P. K.
  • GREEN AND SUSTAINABLE TECHNOLOGY: 2nd International Symposium (ISGST2017), AIP Conference Proceedings https://doi.org/10.1063/1.4979402
conference January 2017
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