摘要： 利用LI-6400P型红外气体分析仪测定了苏打盐碱胁迫下水稻剑叶的净光合速率(Pn)、气孔导度(Gs)、胞间CO2浓度(Ci)、蒸腾速率(Tr)、羧化效率(CE)及水分利用率(WUE)对模拟CO₂浓度增强的响应。结果表明:无论是盐碱胁迫(S)还是非盐碱胁迫(NS)水稻剑叶的Pn随Ci的增加而呈上升趋势,增幅趋缓,最终趋于动态平衡 盐碱胁迫使不同CO₂浓度下的Pn降低,同时也降低了水稻叶片的CE,提高了水稻叶片的CO₂补偿点,降低了水稻叶片的光呼吸(Rp) Gs与Tr随Ci的变化趋势基本相同,但盐碱胁迫降低了水稻叶片的Gs和Tr 无论是非盐碱(NS)还是盐碱胁迫(S)水稻叶片的WUE随Ci的升高显著增大,盐碱胁迫却加大了水稻叶片的WUE。

关键词: 水稻, 盐碱, CO₂浓度, 光合生理特性

Abstract: The effect of elevated CO₂concentration on photosynthetic characteristics of the flag leaves at rice fullheading time was studied under soda-salinization stress. The response of photosynthetic rate (Pn) can be divided into threeperiods ainear increase period under low intercellular CO₂ concentration (Ci); smooth increase period under moderate Ci;dynamic balance period under high Ci.But soda-salinization stress decreasedphotosynthetic rate(Pn) and carboxylation eficiency(CE) at each intercellular CO₂ concentration (Ci) as well as enhanced the compensation point of CO₂. Also,thechanges of stomatal conductance(Cs) can be divided two periods ainear decrease period under low Ci; smooth decrease pe-riod under moderate and high Ci.And the trends of transpiration rate (Tr) is the same to those of Gs. Compared with nonsoda salinization stress (NS), Gs and Tr decreased under soda- salinization stress (S) at the same Ci.However soda-saliniza-tion stress enhanced water use efficiency(WUE).

Key words: Rice, Soda sodicity, CO₂ concentration, Photosynthetic physiological characteristics

中图分类号: 

• S511.01