光照对脆江蓠生长及光合色素含量的影响

Impact of light intensity on growth and levels of photosynthetic pigments of Gracilaria chouae

中文关键词: 脆江蓠  相对生长速率  光合色素  光合作用

英文关键词: Gracilaria chouae  Light intensity  Relative growth rate  Photosynthetic pigment  Photosynthesis

中文摘要:

      将福建宁德海区人工养殖的脆江蓠分别于40、80、120、160、200 μmol/m2• s光照下进行培养。测定其相对生长速率、干重、光合色素含量、光合作用速率等指标，并绘制光合作用曲线，计算其光饱和点和光补偿点。结果表明，在低光照(40 μmol/m2• s)下，脆江蓠呈现负生长，但光合色素含量较高；短期(7 d)内，80~120 μmol/m2• s的光照强度适宜脆江蓠生长，相对生长速率显著高于其他光强，光合色素含量也显著高于高光强各组；经长期(14~28 d)培养，高光强(160 ~200 μmol/m2• s)下的脆江蓠相对生长速率和光合色素含量逐渐升高，随光照增强，藻体干重不断增大，在200 μmol/m2• s下干重达到最大；20℃时，脆江蓠呼吸作用速率为0.07±0.03 μmol O2/g•min，最大光合作用速率为0.40±0.12 μmol O2/g•min，光补偿点为35±15 μmol/m2• s，光饱和点为200±60 μmol/m2• s。

英文摘要:

      The impact of light intensity on growth and biomass of Gracilaria chouae were studied under laboratory conditions. It was found that G.chouae could not keep long term growth at a low light intensity (40 μmol/m2•s). In a short time (<7 d), G.chouae achieved the rapidest grow that 80~120 μmol/m2•s, and the content of photosynthetic pigment was greater than the other treatments. In a longer period (14~28 d), the relative growth rate and the content of photosynthetic pigment of G.chouae increased with higher light intensities.Their dry weight reached the peak at 200 μmol/m2•s. The highest photosynthetic rate and respiration rate of G.chouae were obtained at 0.40±0.12 μmol O2/g•s, and 0.07±0.03 μmol O2/g•s respectively.The light saturation and compensation points of G.chouae were 200±60 μmol/m2•s and 35±15 μmol/m2•s, respectively.