Effect of soil amendments on the chemical transformation of arsenic and the microbial diversity in rice paddy microbiome
type: CreativeWork
description: Paddy management practices greatly influence arsenic biogeochemistry. For sustainable rice production, rice needs to be free from arsenic. Different soil amendments such as animal manure in flooded paddy soil could enhance arsenic reductive mobilization, biomethylation, and volatilization which could be a useful option for the arsenic detoxification process. Also, arsM genes in composting manure could enhance arsenic methylation. Furthermore, cattle manure also enhances arsenic mobilization and increased arsenic assimilation in rice grain in some regions. However, the application of biomass ash, a source of silicon (Si) could be beneficial for rice growth, as silicate competes with arsenite for root uptake and hence has the potential to decrease translocation of arsenic into the rice grain. In contrast, the application of chemical fertilizer is not sustainable and could lead to long-run problems. As such, it is hypothesized “do different fertilizers affect the rice paddy microbiome and influence arsenic biogeochemistry, arsenic speciation, methylation and ultimately assimilation of arsenic into rice grain?” Thus, the objectives of this research were to ascertain the effect of different soil amendments on arsenic methylation and mobility in paddy soil and rice arsenic accumulation over time. In addition, how soil amendments affect the abundance and diversity of the arsM, 16S rRNA bacterial and ITS1 fungal genes in the rice microbiome was also investigated. Therefore, the research approach was to set up a rice microcosm experiment in a growth cabinet with a rice cultivar, ‘Yongyou12’ (a Japonica indica hybrid) with application of five different treatments- mineral fertilizers, full-slurry, half-slurry, ash and no application (four replicates per treatment), were applied to study the arsenic biogeochemistry and microbial population in rice paddy microbiome. Rice soil porewater chemical characterization at 7, 14, 28, 56, 84 d, during heading (99-126 d), grain fill (107-…
abstract: Paddy management practices greatly influence arsenic biogeochemistry. For sustainable rice production, rice needs to be free from arsenic. Different soil amendments such as animal manure in flooded paddy soil could enhance arsenic reductive mobilization, biomethylation, and volatilization which could be a useful option for the arsenic detoxification process. Also, arsM genes in composting manure could enhance arsenic methylation. Furthermore, cattle manure also enhances arsenic mobilization and increased arsenic assimilation in rice grain in some regions. However, the application of biomass ash, a source of silicon (Si) could be beneficial for rice growth, as silicate competes with arsenite for root uptake and hence has the potential to decrease translocation of arsenic into the rice grain. In contrast, the application of chemical fertilizer is not sustainable and could lead to long-run problems. As such, it is hypothesized “do different fertilizers affect the rice paddy microbiome and influence arsenic biogeochemistry, arsenic speciation, methylation and ultimately assimilation of arsenic into rice grain?” Thus, the objectives of this research were to ascertain the effect of different soil amendments on arsenic methylation and mobility in paddy soil and rice arsenic accumulation over time. In addition, how soil amendments affect the abundance and diversity of the arsM, 16S rRNA bacterial and ITS1 fungal genes in the rice microbiome was also investigated. Therefore, the research approach was to set up a rice microcosm experiment in a growth cabinet with a rice cultivar, ‘Yongyou12’ (a Japonica indica hybrid) with application of five different treatments- mineral fertilizers, full-slurry, half-slurry, ash and no application (four replicates per treatment), were applied to study the arsenic biogeochemistry and microbial population in rice paddy microbiome. Rice soil porewater chemical characterization at 7, 14, 28, 56, 84 d, during heading (99-126 d), grain fill (107-…
author: Begum, Monira
language: eng
keywords: Microbiome, diversity, abundance, biogeochemistry, arsM gene, 16S rRNA gene, ITS1 gene, amendments, amplicon sequencing, detoxification
date published: 2021-7
date modified: 2026-07-24T03:55:58Z
provider: Queen's University Belfast
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Queen's University Belfast