School of Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China.
Ying Yong Sheng Tai Xue Bao. 2023 Jun;34(6):1563-1571. doi: 10.13287/j.1001-9332.202306.014.
Rice () resistance is its ability to resist various stresses, the changes of which have important impacts on yield security. However, the responses of stress resistance to elevated atmospheric CO concentration and temperature are poorly understood. We conducted a field open top-chamber experiment with (Nanjing 9108 and Jinxiangyu I) based on the CO and temperature automatic control platform. The experimental treatments included ambient CO concentration and temperature treatment (CK, control), elevated CO concentration treatment (C, CO concentration increase of 200 μmol·mol above CK), elevated temperature treatment (T, temperature increase of 2 ℃ above CK) and elevated CO concentration and temperature (CT, CO concentration increase of 200 μmol·mol and temperature increase of 2 ℃ above CK). At the critical growth stages of , we measured superoxide dismutase activity, silica content, total flavanol content, malondialdehyde content, soluble sugar content, proline content, and soluble protein content by cutting the uppermost functional leaves. We obtained the rice stress resistance index (RSRI) by principal component analysis to analyze the differences in the composition of stress resistance indicators under different treatments. Considering the disease resistance of , the spike neck blast disease was counted to verify the expression level of RSRI for stress resistance at maturity stage. Results showed that at the elongation-booting stage, C and CT treatments significantly reduced the RSRI of Jinxiangyu I by 36.5% and 41.1%, respectively, compared with CK. T treatment significantly decreased the RSRI of the two varieties by 44.9% and 33.8%, respectively. The RSRI explained 71.9%-74.3% of the variation in the spike neck blast disease. Overall, the stress resistance of two varieties were adversely affected by elevated temperature at the elongation-booting stage. There was an interactive effect of CO concentration and temperature on stress resistance. Compared with Nanjing 9108, the stress resistance of Jinxiangyu I was more sensitive to elevated CO concentration.
水稻（）抗性是指其抵抗各种胁迫的能力，其变化对产量安全有重要影响。然而，对于大气 CO 浓度升高和温度升高，（）胁迫抗性的响应仍知之甚少。我们基于 CO 和温度自动控制平台，以（南京 9108 和金乡玉 1 号）为材料，开展了田间开顶式气室实验。实验处理包括大气 CO 浓度和温度处理（CK，对照）、CO 浓度升高处理（C，CO 浓度比 CK 升高 200 μmol·mol）、温度升高处理（T，温度比 CK 升高 2 ℃）和 CO 浓度升高与温度升高处理（CT，CO 浓度比 CK 升高 200 μmol·mol，温度升高 2 ℃）。在抽穗期的关键生长阶段，我们通过切割最上部的功能叶片来测量超氧化物歧化酶活性、硅含量、总黄烷醇含量、丙二醛含量、可溶性糖含量、脯氨酸含量和可溶性蛋白含量。我们通过主成分分析获得了水稻胁迫抗性指数（RSRI），以分析不同处理下胁迫抗性指标的组成差异。考虑到（）的抗病性，我们统计了穗颈瘟病的发生情况，以验证成熟期 RSRI 对（）胁迫抗性的表达水平。结果表明，在拔节孕穗期，C 和 CT 处理分别使金乡玉 1 号的 RSRI 降低了 36.5%和 41.1%，T 处理分别使两个品种的 RSRI 降低了 44.9%和 33.8%。RSRI 解释了穗颈瘟病变异的 71.9%-74.3%。总体而言，在拔节孕穗期，高温对两个品种的（）胁迫抗性都有不利影响。CO 浓度和温度对（）胁迫抗性存在交互作用。与南京 9108 相比，金乡玉 1 号的（）胁迫抗性对 CO 浓度升高更为敏感。
