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为了研究短期太阳紫外辐射对钝顶螺旋藻的影响,作者将静止和充气培养的藻体,暴露在全波长太阳辐射PAB(PAR+UVA+UVB),去除UVB辐射PA(PAR+UVA)及切断所有紫外辐射的光合有效辐射P(PAR)三种光处理条件下,测定了其光化学效率的变化。结果表明,紫外辐射(UVP)及光合有效辐射(PAR)均能导致钝顶螺旋藻的光化学效率降低,表现出了明显的光抑制,但是,UVR可导致更大程度的光抑制。充气培养条件下,与早晨(07:00)初始值相比,PAR导致了11%~20%的光抑制,而UVR(PAB-P)所产生的额外光抑制占9%~31%;静止培养条件下,UVR的存在使得螺旋藻的光化学效率趋近于零(无法检出)。在两种培养条件下,藻细胞所受最大光抑制均发生在中午,下午(17:00)表现出不同程度的恢复。紫外辐射使得类胡萝卜素及藻蓝蛋白与叶绿素a含量的比例增大。与PAB和P相比,PA处理使得螺旋藻类胡萝卜素和藻蓝蛋白与叶绿素含量之比明显升高,UVA可能会诱导类胡萝卜素及藻蓝蛋白的合成。
In order to study the effects of short-term solar ultraviolet radiation on Spirulina platensis, the authors studied the effects of static and inflatable cultured algae exposed to PAB (PAR + UVA + UVB) and UV-B radiation (PAR + UVA) All the photosynthetically active radiation P (PAR) of all the ultraviolet radiation under three light treatment conditions, the change of its photochemical efficiency was measured. The results showed that both UVP and PAR decreased the photochemical efficiency of Spirulina platensis and showed obvious photoinhibition. However, UVR led to a greater degree of photoinhibition. Under infla- tion culture, PAR resulted in a photoperiod of 11% -20% compared with the morning (07:00) initial value, whereas additional suppression of light by UVR (PAB-P) was 9% to 31% Under the culture conditions, the presence of UVR makes the photochemical efficiency of spirulina approach to zero (undetectable). Under the two culture conditions, the maximum light inhibition of algae cells occurred at noon, afternoon (17:00) showed varying degrees of recovery. UV radiation increases the ratio of carotenoids and phycocyanin to chlorophyll a content. Compared with PAB and P, PA treatment significantly increased the ratio of carotenoids and phycocyanin to chlorophyll in spirulina, and UVA might induce the synthesis of carotenoids and phycocyanin.