海洋酸化与磷浓度变化对龙须菜光合作用和ATPase活性的影响

以大型海藻龙须菜(Gracilaria lemanensis)为实验材料,设置不同CO2浓度(400μL·L–1和1000μL·L–1)和磷浓度(0.5和30μmol·L-1)实验,探讨大气CO2浓度升高对不同磷浓度培养下龙须菜生长、光合作用及ATPase活性的影响.结果显示大气CO2下,磷加富导致龙须菜的相对生长速率...

Effects of ocean acidification and phosphorus concentration on photosynthesis and ATPase activity of Gracilaria lemaneiformis

The effects of different concentrations of phosphorus(0.5 and 30μmol·L-1)on the growth,photosynthetic metabolism and ATPase activity of Gracilaria lemanensis were examined under the conditions of low CO₂ concentration(390μL·L^-1)and high CO₂ concentration(1000μL·L^-1).The results were found that the relative growth rate and the maximum photosynthetic rate increased and the dark respiration rate decreased with the enrichment of phosphorus under ambient CO₂,but the change of phosphorus concentration had no significant effect at the high level of CO₂.At different CO₂ levels,phosphorus enrichment had no significant effect on chlorophyll a,carotenoid content or actual photochemical efficiency of Gracilaria lemanensis,but enhanced ATPase activity significantly.The present study shows that high phosphorus regulates the growth of Gracilaria lemanensis by adjusting the photosynthetic rate,dark respiration rate and ATPase activity,and changing the efficiency of energy utilization at the high level of CO₂.