不同盐渍条件下海滨锦葵光合-光响应模型

Photosynthetic and light-response models of Kostelezkya virginica under different salt stress

采用CIRAS-3便携式光合作用测定仪测定了不同盐渍条件下海滨锦葵在不同光强下的净光合速率。通过非直角双曲线模型、直角双曲线模型、指数模型和直角双曲线修正模型对光合参数和拟合曲线进行比较,探讨盐胁迫下海滨锦葵的光响应过程。结果表明,随着盐浓度的升高,海滨锦葵的净光合速率表现出先增高后降低的趋势。另外,从相对误差和决定系数来看,除了指数模型,其他3个模型在不同盐胁迫的海滨锦葵中均适用;发现随着盐浓度的升高,表观量子效率明显降低。对照条件下直角双曲线模型的拟合度最高,100 mmol·L^(-1)和300 mmol·L^(-1) NaCl处理条件下直角双曲线修正模型为海滨锦葵的最适模型,200 mmol·L^(-1) NaCl处理条件下非直角双曲线模型的拟合度最高。

The net photosynthetic rate was measured by CIRAS-3 portable photosynthesis tester under different light intensity after different salt stress. To investigate the light response process of Kostelezkya virginica under salt stress, the non-rectangular hyperbolic model, the rectangular hyperbolic model, the exponential model and the rectangular hyperbola modified model were used to compare the photosynthetic parameters and the fitting curves. With the aggravation of salt stress, the net photosynthetic rate of Kostelezkya virginica showed the trend of first increasing and then decreasing. Meanwhile, from the relative error and coefficient of determination, we found the other three models had some applicability to the Kostelezkya virginica under different salt stress, except the exponential model. With the increase of salt concentration, the apparent quantum efficiency decreased obviously. The rectangular hyperbolic model fitted the highest degree under contrast conditions. The rectangular hyperbola modified model was the most suitable light response model of Kostelezkya virginica under 100 mmol ·L^-1 and 300 mmol·L^-1 NaCI treatments. The non-rectangular hyperbolic model fitted best at 200 mmol · L^-1 NaCI salt treatment.