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以小麦为研究材料,借助精密环控舱系统、红外热成像仪和光合仪,通过测定叶片温度、气孔导度(Gs)、蒸腾速率(Tr)、胞间CO2浓度(Ci)和光合速率(Pn)等指标,研究空气湿度改变对小麦气孔特性的影响。结果表明:降低空气湿度后,小麦的叶温比(叶片温度/环境温度)在最初的10 min内迅速降低,此后小幅度上升并逐渐达到稳定,而Gs、Tr、Ci和Pn的变化趋势则相反,叶温比适于植物气孔应答空气湿度的研究。与高空气湿度条件相比,离体小麦叶片在低空气湿度下的失水率显著升高,表明空气湿度可显著影响小麦气孔的运动状态。
Wheat (Triticum aestivum L.) was used as research material and the temperature, stomatal conductance (Gs), transpiration rate (Tr), intercellular CO2 concentration (Ci) and photosynthetic rate Pn) and other indicators to study the impact of air humidity on wheat stomatal characteristics. The results showed that the leaf temperature (leaf temperature / ambient temperature) of wheat declined rapidly within the first 10 min after the air humidity was reduced, then increased slightly and gradually stabilized, but the trend of Gs, Tr, Ci and Pn In contrast, the leaf temperature ratio is suitable for studies of stomatal response to air humidity in plants. Compared with the high humidity condition, the water loss of detached wheat leaves at low air humidity increased significantly, indicating that air humidity could significantly affect the stomatal movement of wheat.