不同光质条件下马铃薯光响应曲线拟合模型的比较

为了研究不同光质处理下马铃薯的光合作用能力、光响应曲线,以及数据拟合模型的适用性,通过盆栽试验,利用蓝光(B)和红光(R)光源,设置B、B∶R=1∶3(B1R3)、B∶R=1∶5(B1R5)、B∶R=1∶7(B1R7)和R共5种不同的光质组合,测定马铃薯的光合色素、光合作用强度和光响应曲线,并用指数模型、直角双曲模型、非直角双曲模型、叶子飘模型和指数修正模型拟合光响应曲线,计算不同光质处理下的马铃薯光合参数。结果表明:B1R7处理下的光合色素含量和光合作用能力在5种处理中最高;叶子飘模型和指数修正模型的拟合效果整体较好,尤其是对P_nmax、LSP和R_d的拟合,指数模型、直角双曲模型和非直角双曲模型拟合效果较差;B1R7处理下马铃薯的光补偿点、光饱和点和最大净光合速率在5种光质处理中最高。综上,B1R7的光质组合可以增强马铃薯的光合作用,叶子飘模型和指数修正模型比较适合马铃薯光响应曲线的拟合。

Comparison of fitting models of light response curve of potato under different light quality

In order to study the photosynthetic capacity, light response curve and applicability of data fitting models of potatoes under different light quality treatments, the test was conducted with potato plantlets grown in pot under blue light (B), red light (R), B∶R=1∶3(B1R3), B∶R=1∶5(B1R5), B∶R=1∶7(B1R7) light spectrum to observe photosynthetic pigments, photosynthesis and light response curve of potato. The exponential model, rectangular hyperbolic model, non-rectangular hyperbolic model, Ye modified and modified exponential model were used to fitting light response curve, calculating photosynthetic parameters of potato under different light quality treatments. The results showed that the photosynthetic pigment content and photosynthetic capacity under the B1R7 treatment were the highest among the five treatments, the Ye modified and modified exponential model were better than the exponential model, rectangular hyperbolic model, non-rectangular hyperbolic model, especially in fitting P_nmax, LSP and R_d. The light compensation point, light saturation point and maximum net photosynthetic rate of potato under B1R7 treatment were the highest among the five treatments. The light quality combination of B1R7 could enhance photosynthesis of potato, and Ye modified and modified exponential model were more suitable for fitting potato light response curve.