光照强度对海黍子生长及部分生化指标的影响

Impact of irradiances on growth and biochemical composition of Sargassum muticum

在20、40、80、120、200μmol/m2·s光照强度下,研究了光照梯度对海黍子Sargassum muticum的生长及藻体部分生化指标的影响。结果表明,在80～200μmol/m2·s光照范围内时,海黍子的特定生长率都比较高,且无显著差异,光照低于80μmol/m2·s后,生长率下降,显示了海黍子适宜较高光强的特性。叶绿素a、可溶性蛋白、可溶性糖在光照20μmol/m2·s下含量最高。褐藻多酚含量在光照200μmol/m2时比其余光照条件下增加明显。此特性对于从海黍子中提取褐藻多酚天然产物具有一定的指导意义。

The main effects of irradiances（20,40,80,120,200 μ mol/m^2.s）on growth and biochemical composition of Sargassum muticum were studied indoors.Higher growth rates of S.muticum were observed at irradiance of 80～200 μ mol/m^2.s,and the maximum content of some biochemicals（chlorophyll-a,chlorophyll-b,soluble protein,and soluble sugar）were obtained at the lowest irradiance（20 μ mol/m^2.s）.The rapid increase of algae polyphenols was observed at the highest irradiance（200 μ mol/m^2.s）.The finding has important implication for the extraction of natural polyphenols.