3种专用型甘薯光合光响应曲线及其模型拟合研究  

Photosynthesis Light Response Curves of Three Sweet-potato Varieties and Model Fitting

作　　者：张磊[1,2] 刘维正[2] 辛国胜[2] 韩俊杰[2] 商丽丽[2] 邱鹏飞[2] 林祖军[2] 

机构地区：[1]烟台大学生命科学学院,山东烟台265500 [2]烟台市农业科学研究院,山东烟台265500

出　　处：《中国农学通报》2015年第15期71-77,共7页Chinese Agricultural Science Bulletin

基　　金：国家甘薯产业技术体系"烟台综合试验站"(CARS-11-C-09-2014);烟台市科技发展计划"甘薯新型高产;高效;轻简化覆膜栽培技术集成研究"(2013JH019)

摘　　要：为了揭示甘薯光合光响应特性,并为其筛选出最佳的光合响应曲线拟合模型,准确求得光合主要参数,运用直角双曲线模型、非直角双曲线模型、指数函数模型以及直角双曲线修正模型的方法分别对3种专用型甘薯(鲜食型甘薯、淀粉型甘薯和花青素型甘薯)叶片的光合光响应曲线进行拟合。直角双曲线模型拟合的最大净光合速率(Pnmax)和暗呼吸速率(Rd)远大与实测值,光饱和点(Isat)小于实测值,非直角双曲线模型拟合的Pnmax大于实测值,Isat则远小于实测值,而指数函数模型拟合的Isat、Rd和光补偿点(Ic)均远小于实测值;只有经直角双曲线修正模型拟合所得的光合参数值最接近实测值,且能拟合甘薯光合光响应曲线的光抑制部分。通过比较3种类型甘薯光合特性可知,鲜食型甘薯和淀粉型甘薯的Pnmax和Isat均高于花青素型甘薯,但各类型甘薯的Ic和Rd无明显差异。直角双曲线修正模型所求得光合参数值最接近实测值,日后可运用该模型准确、高效地研究甘薯光合特性;鲜食型甘薯和淀粉型甘薯具有更大的光强适应范围和光合产物的积累潜力。The study aims to reveal the photosynthetic light response characteristics of sweet potato, and select the best photosynthetic response curve fitting model, accurately calculate the main parameters of photosynthetic. Rectangular hyperbolic model, non-rectangular hyperbolic model, exponential function model and modified rectangular hyperbolic model were adopted to fit the photosynthesis light response curves of three sweet-potato varieties （fresh sweet potato, starched sweet potato and purple sweet potato）. The maximum net photosynthetic rate （Pnm=） and dark respiration rate （Rd） fitted by rectangular hyperbolic model were more than the measured values, light saturation point （L.,） was less than the measured values. The P was much more than the measured values fitted by non-rectangular hyperbolic model, but I, was much smaller than the measured values. However the I, Rd and light compensation point （L） were fitted by the exponential model much smaller than the measured values. Only photosynthetic parameters values obtained by the modified rectangular hyperbolic model were closest to the measured values, and this model could fit light suppression section of light response curves of sweet potato. By comparing three types of photosynthetic characteristics of sweet potato, the Pm= and I, of fresh sweet potato and starched sweet potato were higher than that of purple sweet potato, but L and Ra of three sweet potato types had no significant difference. Photosynthetic parameters value is closest to the measured value obtained by modified rectangular hyperbolic model, and this model can be used accurately and efficiently to study photosynthetic characteristics of sweet potato in the future. Fresh sweet potato and starched sweet potato have greater adaptation to light intensity and potential for accumulation of photosynthetic products.

关 键 词：甘薯 光响应曲线 直角双曲线修正模型 光饱和点 

分 类 号：S-3[农业科学]