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| Impact of ozone stress on element absorption and distribution of rice genotypes with different ozone sensitivities |
| Received:November 06, 2015 |
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| KeyWord:rice;ozone stress;element concentration;element uptake;element allocation |
| Author Name | Affiliation | E-mail | | SHAO Zai-sheng | Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China | | | SHEN Shi-bo | Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China | | | JIA Yi-lei | Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China | | | MU Hai-rong | Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China | | | WANG Yun-xia | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225009, China | yxwang@yzu.edu.cn | | YANG Lian-xin | Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China | | | WANG Yu-long | Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China | |
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| Abstract: |
| In this study, 23 rice cultivars or lines were grown in glasshouse-type fumigation chambers at two ozone levels:low ozone concentration as control(C-O3, 10 nL·L-1) and high ozone concentration(E-O3, 100 nL·L-1) until rice maturity. Based on the decreases in the above-ground biomass under high ozone concentration, these rice genotypes were clustered into three groups by the MinSSw(dynamic clustering method-minimum sum of squares within groups) method, namely A, B and C in order of ozone sensitivity from low to high. The effect of ozone stress on element uptake and distribution in rice vegetative organs were then determined. At grain maturity, ozone stress decreased the above-ground biomass of rice by 19%, 39% and 52% for A, B and C group, respectively. Significant treatment effects were observed in groups B and C. Compared to the control, ozone stress significantly increased N, P, K, Mg, Mn, Fe, Cu and Zn concentrations of rice straw in a range of 5% to 42%, but had no effect on Ca concentration. In the contrast, the uptake of N, P, K, Ca, Mg, Fe, Cu and Zn in rice straw were significantly 11% to 34% lower under high ozone concentration. In most cases, the ozone-induced changes in element concentrations and uptake were greater in stems than in leaves. In line with this, ozone stress increased element allocation to leaves but decreased that in stems, resulting in significant increases in the leaf to stem ratios(32% to 92%). There were barely interactions between ozone and rice sensitivity types for element concentrations or allocation in leaves and stems, but significant interactions were found for element uptake. The sensitive rice culltivars showed greater ozone-induced inhibition of element uptake. These results indicate that 100 nL·L-1 ozone have profound impacts on the element concentration, uptake and allocation of rice organs, and that the responses of plant element uptake to ozone stress are significantly affected by rice sensitivity to ozone. |
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