| Effects of low temperature stress during flowering stage on physiological characteristics of rice leaf sheath and seed-setting rate |
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| DOI：10.7606/j.issn.1000-7601.2019.02.17 |
| Key Words: low temperature stress during flowering stage rice leaf sheath physiological characteristics seed-setting rate |
| Author Name | Affiliation | | XIANG Hong-tao | Postdoctoral Program, Heilongjiang Academy of Agricultural Sciences, Harbin, Heilongjiang 150086, China；Institute of Crop Cultivation and Tillage, Heilongjiang Academy of Agricultural Sciences, Harbin, Heilongjiang 150086, China | | LIANG Xiao-yan | College of Agronomy,HLJ Bayi Agricultural University, Daqing, Heilongjiang 163319, China | | ZHENG Dian-feng | College of Agronomy,HLJ Bayi Agricultural University, Daqing, Heilongjiang 163319, China | | LI Wan | Institute of Crop Cultivation and Tillage, Heilongjiang Academy of Agricultural Sciences, Harbin, Heilongjiang 150086, China | | WANG Tong-tong | Institute of Crop Cultivation and Tillage, Heilongjiang Academy of Agricultural Sciences, Harbin, Heilongjiang 150086, China | | WANG Chang | College of Agronomy,HLJ Bayi Agricultural University, Daqing, Heilongjiang 163319, China | | WANG Li-zhi | Institute of Crop Cultivation and Tillage, Heilongjiang Academy of Agricultural Sciences, Harbin, Heilongjiang 150086, China | | LI Bing | College of Agronomy,HLJ Bayi Agricultural University, Daqing, Heilongjiang 163319, China | | QI De-qiang | College of Agronomy,HLJ Bayi Agricultural University, Daqing, Heilongjiang 163319, China |
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| Abstract: |
| Two different cold tolerant rice (Oryza sativa L.) cultivars Longdao 5 (cold tolerant) and Longjing 11 (cold sensitive) were planted in a pot experiment, which was conducted to explore the influence of low temperature stress on the seed-setting rate and physiological characteristics such as membrane permeability, antioxidant enzyme activities in leaf sheath under low temperature stress (15℃ for 1，2，3，4，and 5 days) during flowering stage in growth chambers. The results showed that pollen viability of Longdao 5 and Longjing 11 was significantly decreased by 8.21% and 16.10%, respectively, after treating for 2 days under low temperature. The seed-setting rate of Longdao 5 was significantly decreased to 99.90% after treating for 3 d while Longjing 11 significantly decreased to 60.04% after only 1 d of treatment. The low temperature treatment significantly increased the relative conductivity and contents of proline and soluble protein in rice leaf sheath that peaked after treating for 5 days. The conductivity and contents of proline and soluble protein in Longdao 5 and Longjing 11 increased by 38.01% and 20.77%, 25.06% and 84.85%, 25.82% and 23.63%, respectively, over that of CK. The low temperature treatment also increased the activities of superoxide dismutase(SOD), peroxidase(POD), and catalase(CAT) in leaf sheath, which reached maximum after treating for 3 days. Their contents in Longdao 5 and Longjing 11 increased by 10.57% and 14.90%, 86.26% and 68.71%, 17.73% and 28.25%, respectively, over CK. In summary, low temperature stress during flowering stage caused the increase of lipid peroxidation in rice sheath and induced the antioxidant production in rice sheath and increased the activity of protective enzymes to alleviate injury from the low temperature stress. The low temperature stress during flowering stage led to the decrease of pollen activity and seed setting rate, however, cold-tolerant varieties was more tolerant than cold-sensitive varieties. |
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