摘要
论文研究了不同CO2浓度(390μL/L和700μL/L)和温度(15℃和25℃)对坛紫菜(Porphyra haitanensis)生长与光合作用-温度反应特性的影响。结果表明,相对于25℃生长的海藻,15℃生长的海藻具较高的相对生长速率和色素含量(叶绿素和类胡萝卜素),并且在高CO2下增加趋势更显著。在两种CO2浓度下,15℃生长的坛紫菜可溶性蛋白质和可溶性碳水化合物含量高于25℃生长的坛紫菜。低温10℃胁迫下,15℃生长的坛紫菜最大光量子产量(Fv/Fm)、光能利用效率(α)及非光化学淬灭(NPQ)相对于25℃生长的坛紫菜更稳定;高温35℃使得坛紫菜rETRmax、Fv/Fm、α值均下降,这种下降的程度在15℃生长藻中比25℃生长的藻更大;此外,15℃生长条件下,高CO2生长的坛紫菜受35℃高温胁迫时的Fv/Fm和α下降程度小于正常空气生长下的坛紫菜。高温40℃使坛紫菜rETRmax、Fv/Fm、α、NPQ及qP均急剧下降。结果表明高CO2使得坛紫菜耐高温性能提高。
The marine macroalga Porphyra haitanensis （Bangiales, Rhodophyta） was cultured at different temperatures （15 ℃ and 25 ℃） and CO2 concentrations （390 μL/L and 700 μL/L）, so as to investigate the effects of temperature and CO2 concentration on the growth and thermal characteristics of this species. The results showed that algae grown at 15℃ had higher relative growth rate and pigment contents （Chla and Car） than at 25 ℃. Such temperature effects were more pronounced at high CO2 concentrations. Additionally, algae grown at 15 ℃ showed higher levels of soluble protein and soluble carbohydrate. When exposed to 10 ℃ stress for 3 h, algae grown at 15 ℃ exhibited a slower decline in maximum photochemical quantum yield （Fv/Fm）, photosynthetic light use efficiency （a） and non-photochemical quenching （NPQ） as compared to those grown at 25℃. When treated with 35 ℃ for 3 h, the rETRmax, Fv/Fm and a all decreased, with the algae grown at 15℃ displaying higher decrease extent than those at 25 ℃. However, such decrease was less pronounced in the algae cultured at high CO2 concentrations as compared to those cultured at normal CO2 Concentration. When treated with 40 ℃, the rETRmax, Fv/Fm, a, NPQ and qP drastically decreased. Our results suggested that elevated CO2 improved the heat endurance in P. haitanensis.
出处
《生态科学》
CSCD
北大核心
2013年第2期151-157,共7页
Ecological Science
基金
国家自然科学基金项目(41076094
41276148)
关键词
坛紫菜
CO2
温度
生长
光合作用
Porphyra haitanensis
CO2
temperature
growth
photosynthesis
