Frontiers Science Center for Deep Ocean Multispheres and Earth System, Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, 266100, China; Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao, 266071, China; College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266100, China.
College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao, 266100, China.
Mar Environ Res. 2020 Dec;162:105177. doi: 10.1016/j.marenvres.2020.105177. Epub 2020 Oct 13.
Nitric oxide (NO) has been identified as a key physiological modulator and signaling molecule in animals and plants. However, due to its high reactivity, our knowledge of its production and consumption pathways in the ocean remain limited. Laboratory experiments showed that Ulva prolifera can produce NO, producing as much as 0.44 ± 0.04 nmol h g. During the growth period, U. prolifera released NO, but during the decay period NO was absorbed by U. prolifera and bacteria. Furthermore, field investigations examined NO concentrations in the coastal waters of the Yellow Sea off Qingdao, where the U. prolifera green tide occurred in summer 2018. The average concentrations of NO in the surface seawater were 70.2 ± 38.2 pmol L and 18.9 ± 10.3 pmol L in the late- and after-bloom periods, respectively. NO release by U. prolifera was the primary contributor to the high NO concentrations during the late-bloom period. The study area was a net source of NO to the atmosphere during the study period, with average NO sea-air fluxes from the Qingdao coastal waters being 1.5 × 10 mol m s and 0.4 × 10 mol m s in the late- and after-bloom periods, respectively. This study concluded that the coastal waters of the Yellow Sea off Qingdao contributed more NO to the atmosphere during the bloom of U. prolifera than afterward.
一氧化氮（NO）已被确定为动物和植物中关键的生理调节剂和信号分子。然而，由于其高反应性，我们对其在海洋中的产生和消耗途径的了解仍然有限。实验室实验表明，石莼可以产生 NO，产生的量高达 0.44±0.04nmol h g。在生长期间，石莼释放 NO，但在衰退期间，NO 被石莼和细菌吸收。此外，实地调查研究了 2018 年夏季青岛黄海沿岸海域的硝酸盐浓度。表层海水中的平均硝酸盐浓度分别为 70.2±38.2pmol L 和 18.9±10.3pmol L，在晚花期和衰退期。石莼的 NO 释放是晚花期高 NO 浓度的主要原因。在研究期间，研究区域是大气中 NO 的净源，来自青岛沿海海域的平均 NO 海气通量分别为 1.5×10 mol m s 和 0.4×10 mol m s，分别在晚花期和衰退期。本研究得出结论，与石莼衰退期相比，青岛黄海沿岸海域在石莼水华期向大气中输送的 NO 更多。
