不同盐度下水华束丝藻对CO2浓度倍增的生理响应
CO2 EFFECT OF DOUBLED CO2 AND SALINITY ON SOME PHYSIOLOGICAL CHARACTERISTICS OF APHANIZOMENON FLOSA2QUAE
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摘要: 本文研究了在盐度分别为2‰和4‰的条件下,CO2浓度倍增对水华束丝藻(Aphanizomenonflos-aquae)生长速率、光合活性及光合色素比例与丙二醛含量的影响。结果表明随着盐度的增加水华束丝藻的生长速率和光合活性受到显著抑制,叶绿素a与藻蓝素比例大幅降低,丙二醛含量明显提高。在实验盐度范围内,CO2浓度倍增显著促进水华束丝藻的生长速率和最大光合电子传递速率(ETRmax)与色素比例,而且盐度越高促进效果越明显。此外CO2浓度倍增能显著降低丙二醛(MDA)含量。从而减少膜脂过氧化,缓解盐度胁迫。Abstract: Aphanizomenon flos-aquae bloom appears regularly nearly at March in recent years. In order to investigate the response of the cyanobacterium A. flos-aquae to the combination of doubled CO2concentration and salinity, an experiment was carried out. Growth rate, photosynthesis, maximal electron transport rate (ETRmax), the ratio of photosynthetic pigment chlorophyll a to phycocyanin (Chl a/ PC) and malondialdehyde (MDA) levels of A. flos-aquae were analyzed. The results demonstrated that salt stress caused decrease in A. flos2aquae growth by disrupting physiological processes, especially photosynthesis. Increased salinity lowered ETRmax. MDA content was increased when salinity elevated. And higher salinity has more distinct effect. Growth rate, ETRmax and Chl a/ PC could be enhanced by elevated CO2concentration, while doubled CO2reduced MDA content.
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Keywords:
- Doubled CO2 /
- Salinity /
- ETRmax /
- MDA
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