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在盆栽条件下,研究了灌浆期燕麦在水分胁迫条件下光合有效辐射对叶片净光合速率、胞间CO2浓度及气孔导度的影响。结果表明,净光合速率对光合有效辐射的响应均呈直角双曲线变化,水分胁迫不仅使净光合速率减小,而且光补偿点、光饱和点及呼吸速率也明显降低;水分胁迫还使叶片胞间CO2浓度、气孔导度减小,且随光合有效辐射增强减小幅度增大;分析认为,气孔导度和光合速率直接影响胞间CO2浓度变化,但在水分胁迫条件下前者则是影响胞间CO2浓度变化的主要因素,也就是水分胁迫致使净光合速率下降更主要是由于气孔因素作用的结果。
Under pot culture, the effects of photosynthetically active radiation on net photosynthetic rate, intercellular CO2 concentration and stomatal conductance of oat under water stress were studied. The results showed that the net photosynthetic rate response to photosynthetically active radiation showed a right angle hyperbola variation. Water stress not only reduced the net photosynthetic rate, but also the light compensation point, light saturation point and respiration rate also significantly reduced; water stress leaves cells The results showed that both the stomatal conductance and the photosynthetic rate directly affected the changes of intercellular CO2 concentration, but the former was affected by water stress The main reason for the change in CO2 concentration is the decrease of net photosynthetic rate caused by water stress, which is mainly due to the effect of stomatal factors.