Project description:Land cover change has long been recognized that marked effect the amount of soil organic carbon. However, little is known about microbial-mediated effect processes and mechanism on soil organic carbon. In this study, the soil samples in a degenerated succession from alpine meadow to alpine steppe meadow in Qinghai-Tibetan Plateau degenerated, were analyzed by using GeoChip functional gene arrays.
Project description:4-week old Arabidopsis plants grown in soil were flooded to the soil surface (root flooding) or completely submerged under 6 cm of water (submergence). Samples are collected at the time specified.
Project description:Arsenic (As) bioavailability in the rice rhizosphere is influenced by many microbial interactions, particularly by metal-transforming functional groups at the root-soil interface. This study was conducted to examine As-transforming microbes and As-speciation in the rice rhizosphere compartments, in response to two different water management practices (continuous and intermittently flooded), established on fields with high to low soil-As concentration. Microbial functional gene composition in the rhizosphere and root-plaque compartments were characterized using the GeoChip 4.0 microarray. Arsenic speciation and concentrations were analyzed in the rhizosphere soil, root-plaque, porewater and grain samples. Results indicated that intermittent flooding significantly altered As-speciation in the rhizosphere, and reduced methyl-As and AsIII concentrations in the pore water, root-plaque and rice grain. Ordination and taxonomic analysis of detected gene-probes indicated that root-plaque and rhizosphere assembled significantly different metal-transforming functional groups. Taxonomic non-redundancy was evident, suggesting that As-reduction, -oxidation and -methylation processes were performed by different microbial groups. As-transformation was coupled to different biogeochemical cycling processes establishing functional non-redundancy of rice-rhizosphere microbiome in response to both rhizosphere compartmentalization and experimental treatments. This study confirmed diverse As-biotransformation at root-soil interface and provided novel insights on their responses to water management, which can be applied for mitigating As-bioavailability and accumulation in rice grains.
Project description:Wild Type and OsTZF5-OX plants were grown in soil in isolation green house for 2 weeks under flooded lowland conditions and a 12 h/12 h light/dark cycle (1000 umol photons/m2/s) at 28C (day) and 25C (night).
Project description:Wild Type and OsTZF1-OX plants were grown in soil in isolation green house for 2 weeks under flooded lowland conditions and a 12 h/12 h light/dark cycle (1000 umol photons/m2/s) at 28C (day) and 25C (night).
Project description:Rice plants (Oryza sativa L. cv. Nipponbare) were grown in plastic pots filled with nutrient soil for 2 weeks under flooded lowland conditions with a 12-h light (28C)/12-h dark (25C) regimen (ca. 1500 umol photons mM-^V2 sM-^V1). The plants were subjected to dehydration treatment by growth at 28C without watering for either 2 days until the soil moisture content was 18.7% (w/w; SD = 1.3%).
Project description:Rice plants (Oryza sativa L. cv. Nipponbare) were grown in plastic pots filled with nutrient soil for 2 weeks under flooded lowland conditions with a 12-h light (28C)/12-h dark (25C) regimen (ca. 1500 umol photons mM-^V2 sM-^V1). The plants were then subjected to dehydration treatment by growth at 28C without watering for 2 days until the soil moisture content was 18.7% (w/w; SD = 1.3%).
Project description:Rice plants (Oryza sativa L. cv. Nipponbare) were grown in plastic pots filled with nutrient soil for 2 weeks under flooded lowland conditions with a 12-h light (28C)/12-h dark (25C) regimen (ca. 1500 umol photons mM-^V2 sM-^V1). The plants were subjected to dehydration treatment by growth at 28C without watering for 3 days until the soil moisture content was 15.6% (w/w; SD = 1.1%).
Project description:Wild-type rice plants (O. sativa L. cv. Nipponbare) were grown in plastic pots filled with nutrient soil for 2 weeks under flooded lowland conditions and a 12 h/12 h light/dark cycle (50 ± 10 ?mol photons/m2/s) at 28°C (day) and 25°C (night). For dehydration treatment, two-week-old plants were incubated for 3 days without watering. The soil moisture content was 15.6% on day 3 of dehydration.
Project description:Rice plants (Oryza sativa L. cv. Nipponbare) were grown in plastic pots filled with nutrient soil for 2 weeks under flooded lowland conditions with a 12-h light (28C)/12-h dark (25C) regimen (ca. 1500 umol photons mM-^V2 sM-^V1). The plants were cold treated by transfer from 28C to 10C with growth for 2 days
