关键词: 盐胁迫, 海滨锦葵, 光响应模型

Abstract:

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 NaCl treatments. The nonrectangular hyperbolic model fitted best at 200 mmol·L^-1 NaCl salt treatment.

Key words: Kostelezkya virginicas, salt stress, light response model