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Evaluation of rice root oxidizing potential using digital image analysis
Atulba, Sarah Louise,Gutierrez, Jessie,Kim, Gil Won,Kim, Sang Yoon,Khan, Muhammad Israr,Lee, Yong Bok,Kim, Pil Joo The Korean Society for Applied Biological Chemistr 2015 Applied Biological Chemistry (Appl Biol Chem) Vol.58 No.3
The aerenchymal transport of oxygen to rice roots has significantly influenced the anaerobic root zone of flooded paddy soils. Therefore, the visualization of redox dynamics may be useful to characterize rice root oxidation potentials and the dynamics of redox-influenced ions in the root zone of paddy soils. In order to investigate the interaction between root oxidation potential and Fe uptake of (a) six different rice cultivars (Oryza sativa L.; Chuchung, Dongjin, Ilmi, Junam, Nampyeong, and Samkwang) were monitored in a flooded paddy soil with the aid of rhizotron experiment throughout the vegetation period, (b) digital images of the root zone were taken at the important growing stages, and (c) rice Fe uptake was characterized simultaneously. The images were processed by image analysis to display the reduction and oxidation areas in the root zones, and the distinct areas which were colorized due to varying soil redox changes were localized and quantified. Oxidized areas were mainly observed in the surrounding active roots and in a distinct layer on the soil surface. The selected rice cultivars have shown significantly different root-oxidized areas at the same rice growing stage. Root-oxidized area was significantly and positively correlated with total Fe content of rice root, but negatively correlated with the inner root Fe content. Rice cultivars having higher root oxidation potential precipitated more Fe on the outer root surface in the form of Fe plaques. In conclusion, digital image analysis is an effective tool for evaluating the oxidizing potential of rice root under anaerobic soil condition.
Evaluation of rice root oxidizing potential using digital image analysis
Sarah Louise Atulba,Jessie Gutierrez,김길원,김상윤,Muhammad Israr Khan,이용복,김필주 한국응용생명화학회 2015 Applied Biological Chemistry (Appl Biol Chem) Vol.58 No.3
The aerenchymal transport of oxygen to rice roots has significantly influenced the anaerobic root zone of flooded paddy soils. Therefore, the visualization of redox dynamics may be useful to characterize rice root oxidation potentials and the dynamics of redox-influenced ions in the root zone of paddy soils. In order to investigate the interaction between root oxidation potential and Fe uptake of (a) six different rice cultivars (Oryza sativa L.; Chuchung, Dongjin, Ilmi, Junam, Nampyeong, and Samkwang) were monitored in a flooded paddy soil with the aid of rhizotron experiment throughout the vegetation period, (b) digital images of the root zone were taken at the important growing stages, and (c) rice Fe uptake was characterized simultaneously. The images were processed by image analysis to display the reduction and oxidation areas in the root zones, and the distinct areas which were colorized due to varying soil redox changes were localized and quantified. Oxidized areas were mainly observed in the surrounding active roots and in a distinct layer on the soil surface. The selected rice cultivars have shown significantly different root-oxidized areas at the same rice growing stage. Root-oxidized area was significantly and positively correlated with total Fe content of rice root, but negatively correlated with the inner root Fe content. Rice cultivars having higher root oxidation potential precipitated more Fe on the outer root surface in the form of Fe plaques. In conclusion, digital image analysis is an effective tool for evaluating the oxidizing potential of rice root under anaerobic soil condition.
구두 발표 : 구두발표(OA) - 농업환경 및 토양,수질 분야 ; 토양 산화환원 전위 변화에 따른 벼의 철 흡수 조절인자로서 근권산화력 평가
사라루이스아툴바 ( Sarah Louise Atulba ),제시구티어레즈 ( Jessie Gutierrez ),김길원 ( Gil Won Kim ),김필주 ( Pil Joo Kim ) 한국환경농학회 2013 한국환경농학회 학술대회집 Vol.2013 No.-
Phosphorus is an essential macronutrient commonly precipitated with Fe, Ca and Al. Generally applied chemical amendments such as of FeCl3, CaCO3 and Al were known to effectively reduce soluble P in soil solutions. However, in the paddy fields with permanent reduced soil conditions, Fe solubility as well as the availability or solubility of P increase as these elements are reduced and converted into more soluble forms. Similar effects can be observed in Fe and Mn which are essential micronutrients whose dynamics can be affected by the redox condition of the soil. Iron and Mn are required by plants in trace amounts however, with the developing reduced condition in paddy soils, their solubility increase which may lead to subsequent toxicity effects of the excessive uptake of these micronutrients by plants. It has been reported that roots can oxidize various compounds present in the soil which serves as a defense mechanism of rice against toxic substances such as Fe2+, hydrogen sulfide (H2S) and others. This study hypothesized that the oxidizing potential of rice roots may act as a regulator of ions influenced by soil redox changes. A mini rhizotron experiment was conducted to evaluate the oxidizing potential of six rice cultivars (Chuchung, Dongjin, Junam, Ilmi, Nampyeong & Samkwang). The root oxidized area was obtained through digital image analysis using Adobe Photoshop CS5 and image analyzer (http://mkwak.org/imgarea/analysis.php). Iron, P and Mn contents were determined by chemical and ICP analyses. Cultivars with high root oxidize area showed higher Fe content on the surface of the roots (Fe plaque). Iron plaque has a positive correlation with the external P and Mn contents of the roots and a negative correlation with the inner root P and Mn. Conclusively, root oxidizing potential of rice enhances the formation of Fe plaque on the surface of the roots. The Fe plaques served as a reservoir of P and Mn for plant uptake however in higher amounts, it serves as a barrier on the root surface to prevent excessive uptake of toxic elements from the soil.