Significance of Bacterial Exoenzymes in Organic Matter Cycling in the Antarctic Ocean

将初级生产者的碳与细菌偶联， 显著影响有机质垂直通量的格局 海洋中的物质。 因为细菌必须水解颗粒 在摄取之前，细菌外水解酶必须承担核心作用， 从颗粒有机物到微生物的碳通量 循环. 细菌外切水解酶的表达受 因此，在沃茨中， 粒子和聚合物。 在高纬度沃茨， 浮游植物生产在漫长的极夜。 的 要检验的假设是，在南极的冬天， 细菌外切水解酶的产生停止。 因此，粒子 早春开花期间产生的聚合物不能 被细菌利用。 外切水解酶在有机时表达， 物质积累到临界水平;因此，耦合 颗粒有机物和细菌之间的联系变得很强。 现场和实验室操作将检查环境线索 其调节外切水解酶活性。 这些知识应 有助于理解生物生产 有机物质的途径的机制和可变性 在南大洋骑车

Coupling of carbon from primary producers to bacteria can significantly influence the patterns of vertical flux of organic matter in the ocean. Because bacteria must hydrolyze particles before uptake, bacterial exohydrolases must assume a central role in carbon flux from particulate organic matter into the microbial loop. The expression of bacterial exohydrolases is regulated by substrate concentration and therefore may cease in waters depleted of particles and polymers. In high latitude waters there is no phytoplankton production during the protracted polar night. The hypothesis to be tested is that during the Antarctic winter, the production of bacterial exohydrolase ceases. Therefore, particles and polymers produced during the early spring bloom cannot be utilized by bacteria. Exohydrolases are expressed when organic matter accumulates to a critical level; consequently, the coupling between particulate organic matter and bacteria becomes strong. Field and laboratory manipulations will examine environmental cues which regulate exohydrolase activities. This knowledge should contribute to the understanding of biological production mechanisms and variability in the pathways of organic matter cycling in the Southern Ocean.