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| Impacts of ozone stress on grain amino acids of super rice cultivar Nanjing 9108 differ with grain positions on a panicle |
| Received:October 24, 2016 |
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| KeyWord:atmospheric change;ozone;rice;amino acids;grain position on a panicle |
| Author Name | Affiliation | E-mail | | MU Hai-rong | Yangzhou University/Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou 225009, China | | | SHAO Zai-sheng | Yangzhou University/Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou 225009, China | | | SHEN Shi-bo | Yangzhou University/Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou 225009, China | | | JING Li-quan | Yangzhou University/Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou 225009, China | | | WANG Yun-xia | College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225009, China | | | WANG Yu-long | Yangzhou University/Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou 225009, China | | | YANG Lian-xin | Yangzhou University/Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops, Yangzhou 225009, China | lxyang@yzu.edu.cn |
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| Abstract: |
| The increase of ground-level ozone concentration caused by human activities can reduce rice yield, but its effects on rice quality, especially super rice quality in association with grain positions in panicles were not studied yet. A Japonica super rice NJ9108 was grown in glasshouse type chambers at either low(18 nL·L-1) or high(100 nL·L-1) ozone concentration from seedling transplanting until plant maturity. The seeds on a panicle were separated into three groups based on its position on a panicle, namely upper, middle and lower part of a panicle. The grains from the upper and lower part of the panicle refer to superior and inferior grains, respectively. Compared with plants grown in clean air with low ozone concentrations, ozone stress significantly increased the contents of total amino acids, essential amino acids and nonessential amino acids, but the percentage of essential or nonessential amino acids to total amino acids was unchanged. Except for cysteine, ozone stress induced a trend of increase in the concentrations of other 16 amino acids, among which the significant increases were detected for threonine, serine, glutamic acid, leucine, tyrosine, aspartate and phenylalanine. In general, ozone stress had greater impacts on amino acid concentrations of inferior grains than the superior grains or the grains in the middle part of a panicle, and ozone by grain position interactions were significant at P<0.1 for concentrations of phenylalanine, tyrosine, histidine, arginine. The results indicated that ozone concentration of 100 nL·L-1 during the growth of super rice increased total amino acids and its components, and in most cases, the increase of amino acids concentration in inferior grains is greater than superior grains. |
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