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| Impacts of ozone stress on stem lodging resistance of rice genotypes with varying ozone sensitivities |
| Received:March 30, 2017 |
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| KeyWord:rice;ozone;lodging resistance;plant internode breaking resistance;paddy growth |
| 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 | | | 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 | | | ZHAO Yi-peng | Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou University, Yangzhou 225009, China
Xuzhou Institute of Agricultural Sciences of the Xuhuai District of Jiangsu Province, Xuzhou 221121, 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 | | | WANG Yun-xia | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225009, China | | | 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 | lxyang@yzu.edu.cn | | 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 | ylwang@yzu.edu.cn |
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| Abstract: |
| From a week after transplanting until maturity, 23 rice cultivars or lines were grown in glasshouse-type fumigation chambers, with a control group receiving low concentrations of ozone(C-O3, 10 nL·L-1) and an elevated O3 treatment group receiving high concentrations of ozone(E-O3, 100 nL·L-1). Based on ozone-induced changes in the aboveground biomass, these rice genotypes were clustered, using the MinSSw method(a dynamic clustering method using minimum sum of squares within groups) into three types, namely A(-19%), B(-39%), and C(-52%) in ascending order of ozone sensitivity. Ozone stress decreased the breaking resistance of the third internode from the top of rice types A, B, and C by 19% to 20%, but decreased breaking resistance in the fourth internode from the top of the three rice types by 28%, 36%, and 44% respectively. Ozone-induced changes in pushing resistance of the lower part of a single plant showed a trend similar to that of the fourth internode from the top. Ozone stress significantly decreased the length, dry weight, dry weight per unit length, cross-sectional area, maximum stem diameter, minimum stem diameter, and culm wall thickness of the basal internodes, with the dry weight of the internode showing the greatest decrease(on average 58%), whereas the maximum stem diameter, minimum stem diameter, and culm wall thickness showed the least decline(on average 13% to 15%). In most cases, the ozone-induced changes in the seven parameters of the fourth internode from the top were greater than those of the third internode from the top, and ozone-internode interactions were significant for the length, dry weight per unit length, cross-sectional area, maximum stem diameter, and minimum stem diameter of the basal internodes. Among the different rice types, the ozone-induced reduction in each measured parameter followed the pattern C > B > A, and ozone-rice type interactions were significant for the cross-sectional area, maximum stem diameter, and minimum stem diameter of the basal internodes. Correlation analysis showed that the response of basal internode breaking resistance to ozone stress was positively correlated with cross-sectional area, maximum stem diameter, minimum stem diameter, or dry weight per unit length of the corresponding internodes. These results indicated that ozone fumigation at concentrations of 100 nL·L-1 deteriorated the culm quality of the different types of rice. Ozone stress significantly decreased the breaking resistance of the rice stem, which was mainly associated with basal internode thinning, and also with the decline of dry weight per unit length of the basal internodes. |
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