Exploring the best model for describing light-response curves in two Epimedium species.

Photosynthetic responses to light environment can be useful measurements to determine favorable habitat conditions for the conservation and cultivation of medicinal species. The nonrectangular hyperbola model, rectangular hyperbola model, modified rectangular hyperbola model, exponential model, modified exponential model are used to explore the best model for describing light-response curves in two Epimedium species. The results show that the light-response curves of E. wushanense and E. acuminatum were best described by the modified exponential model, the test MSE and MAE of the modified exponential model were smaller, and the LSP and Pmax calculated by the modified exponential model were more accurate than those calculated by other models in E. wushanense and E. acuminatum. This model may be widely applicable to light-response curves of other Epimedium species.