Abstract：
Decreasing ocean surface pH, called ocean acidification (OA), is among the major risks for marine ecosystems due to human-driven atmospheric pCO2 increase. Understanding the molecular mechanisms of adaptation enabling marine species to tolerate a lowered seawater pH could support predictions of consequences of future OA scenarios for marine life. This study examined whether the ATP-binding cassette (ABC)-like gene slr2019 confers tolerance to the marine cyanobacterium Halomicronema metazoicum to low seawater pH conditions (7.7, 7.2, 6.5) in short- and long-term exposures (7 and 30 d). Photosynthetic pigment content indicated that the species can tolerate all three lowered-pH conditions. At day 7, slr2019 was up-regulated at pH 7.7 while no changes were observed at lower pH. After 30-d exposure, a significant decrease in slr2019 transcript levels was observed in all low-pH treatments. These first results indicate an effect of low pH on the examined transporter expression in H. metazoicum.
摘要：
降低海洋表面的pH值,称为海洋酸化(OA)，是人类驱动的大气pCO2增加对海洋生态系统的主要风险之一。了解使海洋物种能够耐受降低的海水pH值的适应分子机制可以支持对未来OA情景对海洋生物的后果的预测。这项研究检查了ATP结合盒（ABC）样基因slr2019是否在短期和长期暴露（7和30d）中赋予海洋蓝细菌Halomicronemametazoicum对低海水pH条件（7.7、7.2、6.5）的耐受性。光合色素含量表明该物种可以耐受所有三种降低的pH条件。在第7天,slr2019在pH7.7上调,而在较低pH下没有观察到变化。暴露30天后，在所有低pH处理中,slr2019转录水平均显著下降.这些最初的结果表明低pH对所检查的转运体表达的影响。
