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| Effects of Free Air Ozone Enrichment on Growth and Yield of Super Rice Ⅱ-you 084 |
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| KeyWord:super rice; ozone; growth; yield |
| Author Name | Affiliation | | PENG Bin | ey Laboratory of Crop Genetics ＆ Physiology of Jiangsu Province, Yangzhou University, Yangzhou 225009, China
Yancheng Institute of Technology, Yancheng 224000, China | | LAI Shang-kun | Key Laboratory of Crop Genetics ＆ Physiology of Jiangsu Province, Yangzhou University, Yangzhou 225009, China | | LI Pan-lin | Key Laboratory of Crop Genetics ＆ Physiology of Jiangsu Province, Yangzhou University, Yangzhou 225009, China | | WANG Yun-xia | Key Laboratory of Crop Genetics ＆ Physiology of Jiangsu Province, Yangzhou University, Yangzhou 225009, China
State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | ZHOU Nan | Key Laboratory of Crop Genetics ＆ Physiology of Jiangsu Province, Yangzhou University, Yangzhou 225009, China | | ZHU Jian-guo | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | YANG Lian-xin | Key Laboratory of Crop Genetics ＆ Physiology of Jiangsu Province, Yangzhou University, Yangzhou 225009, China | | WANG Yu-long | Key Laboratory of Crop Genetics ＆ Physiology of Jiangsu Province, Yangzhou University, Yangzhou 225009, China |
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| Abstract: |
| An ozone FACE（free air concentration enrichment） experiment was conducted to investigate the effects of ozone stress on growth, development, photosynthesis, and yield of super rice at ambient and elevated ozone concentrations（ambient×1.25） usingⅡ-you 084 cultivar with two seedling ages（no tiller and one-tiller）. The results showed：（1）Ozone stress accelerated phonological development for about one week, and decreased plant height at maturity by 8%.（2）Ozone stress decreased the SPAD value, net photosynthetic rate（Pn）, stomatal conductivity（Gs） and transpiration rate（Tr） of flag leaves during the grain-filling period with the effect being larger in the late vs. early stage. However, no ozone effect was detected on intercellular CO2 concentration（Ci）. （3）Elevated ozone concentration greatly reduced total dry matter accumulation at maturity stage, by 24%, which was largely due to the decrease of dry matter production in the period from heading to maturity stage.（4）There was no ozone effect on the panicle number per unit ground area. However, elevated ozone concentration reduced spikelet number per panicle, filled grain percentage and filled grain weight by 19%, 12%, and 5%, respectively, and significantly increased the blighted grain rate and empty grain rate as well. As a result, grain yield was reduced by an average of 27% under ozone stress.（5）Although no significant interactions was observed between ozone and seedling ages, the responses of plant height, leaf SPAD value, spikelet number per panicle, filled grain percentage, sterile grain percentage and unfulfilled grain percentage to ozone were slightly less in one-tiller seedlings than in no tiller seedlings. Ozone-induced yield loss of Ⅱ-you 084 might be due mainly to reduced sink capacity per panicle, and partly to decreased grain-filling ability. The latter was associated with inhibited photosynthesis during the late growth stage of rice. |
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