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以上海荷花品种‘伯里夫人’为试验材料,设置全光照和林下遮荫(50%全光照)2种不同的光照环境,采用4种光响应模型拟合分析荷花叶片净光合速率光响应过程,比较不同光照下适宜的光响应模型,研究荷花品种对遮荫环境的适应规律.结果表明:4种模型对荷花叶片光合作用光响应过程拟合效果的优劣顺序为:直角双曲线修正模型>指数模型>非直角双曲线模型>直角双曲线模型,后3种模型均为没有极值的函数,不能直接求得最大净光合速率(Pn max)和光饱和点(LSP).直角双曲线修正模型对LSP、Pn max、暗呼吸速率(Rd)和光补偿点(LCP)等光响应参数表现出最佳的拟合效果,拟合值与实测值相对误差最小.随光强减弱,荷花主要的光合生理参数均降低,其中,Rd下降幅度显著,其他参数变化不显著.说明荷花对适度弱光环境具备一定的适应能力,表现出良好的光合适应性反应与调节,能够维持植株的正常生长.
Two varieties of light environment, full light and shade under shade (50% full illumination), were set up in the laboratory of Shanghai lotus flower, ’Baili’erou, and four light response models were used to fit the net photosynthetic rate response And the appropriate light response model under different light conditions was compared to study the law of adaptability of lotus varieties to shady environment.The results showed that the fitting order of the four models to the photosynthesis light response process of lotus leaf was the order of hyperbola correction Model> exponential model> non-right-angle hyperbola model> right-angle hyperbola model, the latter three models are functions without extremum, and the maximum net photosynthetic rate (Pn max) and light saturation point (LSP) The correction model showed the best fitting effect on the light response parameters such as LSP, Pn max, dark respiration rate (Rd) and light compensation point (LCP), with the least error between fitting value and measured value.With decreasing light intensity, Photosynthetic physiological parameters decreased, among them, Rd decreased significantly, the other parameters did not change significantly.Lhybrids have moderate adaptability to low light environment, showing good photosynthetic adaptive response and regulation, can dimension Hold the normal growth of plants.