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United States Department of Agriculture

Agricultural Research Service

Research Project: ENVIRONMENTALLY SOUND MANURE MANAGEMENT FOR REDUCTION OF GAS EMISSIONS, NUTRIENTS, AND PATHOGENS

Location: Agroecosystem Management Research

Title: Bacterial diversity of rice fields in the South of Brazil

Authors
item Pittol, Michele -
item Durso, Lisa
item Valiati, Victor Hugo -
item Fiuza, Lidia Mariana -

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: September 11, 2013
Publication Date: N/A

Interpretive Summary: Rice is an important agricultural crop. Bacteria in rice fields contribute to the health of the rice ecosystem. Rice is grown under shallow flooded or wet paddy conditions that lead to a wide range of macro- and micro-environments that differ in their, physical properties, light status, and nutrient sources for the bacteria. As a result microorganisms find environments suitable for their growth in wetland rice fields. We compared the bacterial communities in sediment from rice during vegetative growth, with sediment from rice during its reproductive stage. Bacterial communities from the vegetative rice culture stages were distinct from those of the reproductive rice stages. Future studies will assess dynamics of microbial community structure in relation to environmental characteristics and physical-chemical water inputs of rice fields.

Technical Abstract: Irrigated rice fields are aquatic agroecosystems directly influenced by agricultural practices, which include agrochemical application and the input of nutrients related to resource of irrigation. In addition, root exudation and the levels of soil mineral nutrients are important modifiers of the rhizosphere environment and may influence the microbial community composition. This study aims to monitor the bacterial community structure in a rice paddy field in vegetative and reproductive stages of rice growth. The field experiment was performed in a paddy fields located in south of Brazil. Water samples were collected in triplicates from the top 5 cm of the surface plots rice fields in the vegetative and reproductive rice culture stages, in the agricultural cycles of 2011/12 and 2012/13. Products from six DNA replicate corresponded the vegetative and reproductive rice culture stages were pooled for 16S pyrosequencing analysis. Bacterial communities from the vegetative rice culture stages were distinct from those of the reproductive rice stages. Future studies will assess dynamics of microbial community structure in relation to environmental characteristics and physical-chemical water inputs of rice fields.

Last Modified: 10/22/2014
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