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四个水稻 (OryzasativaL .)品种“IR72”、“特三矮 2号”、“桂朝 2号”和“Ⅱ优 44 80”在田间栽于含 35 μmol mol和 6 0 μmol molCO2 的塑料大棚中 ,自然光照。高浓度CO2 下供试水稻品种的光合速率变化表现为提高型 (“IR72”、“特三矮 2号”)、稳定型 (“桂朝 2号”的Pn几无变化 )和下调型 (“Ⅱ优 44 80”)。生长速率、穗重、由Δ1 3 C计算而得的长期水分利用效率和清除DPPH· 自由基的能力皆增加。除“Ⅱ优 44 80”外 ,其他 3个品种明显增高总生物量。供试品种的穗重 总生物量比不同程度地受到高浓度CO2 的改变。叶片段经PEG渗透胁迫后 ,不同的生长于高浓度CO2 者的电解质渗漏率较小。结果表明高浓度CO2 可改变水稻的光合作用和水分关系特性 ,品种间不同的响应显示了选育适于未来高浓度CO2 下具有高产和抗逆性品种的可能性。
Four rice (Oryzasativa L.) cultivars “IR72”, “Te San dian 2”, “Guichao 2” and “Ⅱ You 44 80” were planted in plastic greenhouses containing 35 μmol mol and 60 μmol CO 2 in the field , Natural light. The changes of photosynthetic rate of tested rice cultivars under high CO2 concentration were enhanced (IR72 and TST3), stable (Pn of No.2 Guizhao No.2) and down regulated (“ Ⅱ excellent 44 80 ”). Growth rate, panicle weight, long-term water use efficiency calculated from Δ1 3 C, and ability to scavenge DPPH · free radicals all increased. Except for “Ⅱ You 44 80”, the other three varieties significantly increased the total biomass. The total biomass of panicle weight of tested cultivars was changed to different degrees by high concentration of CO2. After the PEG-osmotic stress on leaf segments, the electrolyte leakage rates of different growth in high concentration of CO2 were less. The results showed that high concentration of CO2 could change the photosynthesis and water characteristics of rice, and the different responses among different varieties showed the possibility of breeding high yielding and resistant varieties with high CO2 concentration in the future.